Nortel-Magellan-Passport-BridgeMIB: View SNMP OID List / Download MIB

This entry controls the addition and deletion of vrPpTbcl components.

A single entry in the table represents a single vrPpTbcl component.

This variable is used as the basis for SNMP naming of vrPpTbcl components. These components can be added and deleted.

This variable provides the component's string name for use with the ASCII Console Interface

This variable represents the storage type value for the vrPpTbcl tables.

This variable represents the index for the vrPpTbcl tables.

This entry controls the addition and deletion of vrPpTbclNs components.

A single entry in the table represents a single vrPpTbclNs component.

This variable is used as the basis for SNMP naming of vrPpTbclNs components. These components can be added and deleted.

This variable provides the component's string name for use with the ASCII Console Interface

This variable represents the storage type value for the vrPpTbclNs tables.

This variable represents the index for the vrPpTbclNs tables.

This group houses all the port specific provisionable attributes associated with Ns. These attributes influence the application of filters to incoming and outgoing frames.

An entry in the vrPpTbclNsProvTable.

This attribute specifies the name of the filter to be applied at the incoming filter point.

This attribute specifies the name of the filter to be applied at the out going filter point.

This group houses all the provisionable attributes that belong to the this group. This group of attributes is applicable to all types of bridge ports and represent the common factor between them. These attributes influence the working of a bridge port.

An entry in the vrPpTbclProvTable.

This attribute specifies the type of translation to be performed on frames carrying IPX packets. Ethernet frames carrying IPX payload could be translated to IEEE 802.3 frames (with the same IPX payload) or vice- versa. The main reason to do so is to allow the bridge unit to consistently forward one type of frames carrying IPX packets. Translations can be turned off altogether in which case the IPX frames will pass through the bridge unit unchanged. Enumeration: 'snap': 3, 'ethernet': 2, 'sap': 4, 'off': 0, 'ieee8023': 1.

This attribute specifies if or not outbound frames carrying IP datagrams should be fragmented to conform to message transfer unit (mtu) sizes dictated by the media. Enumeration: 'on': 1, 'off': 0.

This attribute specifies if the frames should be ordered or not before they are transmitted through a bridge port. If this attribute has a value of ordered the received frames are ordered as in the original message, before they are transmitted out through a bridge port. If it has a value of notOrdered, received then frames pass through the bridge unit in the order they are received. This feature can be used over multiple telecommunication links to increase data flow. Please note that this attribute only affects link protocols and is ineffective with lan media. Enumeration: 'notOrdered': 1, 'ordered': 0.

This attribute is indicative of the state of the MAC address format conversion process for ARP/RARP frames. The MAC addresses may be translated if need be from a canonical format to a non-canonical format, based on the needs of the associated media. If this attribute is set to a value of on then all Mac addresses will converted if need be to suit the format of mac address, the outgoing media will support. If this attribute is set to a value of off no such conversion takes place. Enumeration: 'on': 1, 'off': 0.

This attribute is indicative of the unique number assigned to the bridge port. It is used for SNMP management of this bridge port and in spanning tree as an identifier this bridge port. Notes regarding portNum: Escape routines exist for initializing, copying, and deleting port numbers. This is necessary because SNMP requires a unique port instance identifier. The initPortNum escape routine sets the port number to a value in the range 1-255 for this purpose. The setCopiedPortNum escape routine exists to maintain the uniqueness of the port number in cases when one port is copied to another. When a bridge port is deleted, the releasePortNum escape routine places the port number being released into a pending deletion state. This is because the port number cannot be re-allocated until the port is truely deleted in the current view. This is necessary since there is no guarantee of order when processing changes to multiple protocol ports so without the pending deletion state, the same port number could be temporarily assigned to two ports for a short period of time. The portNum is set as component critical since bridging also uses the port number as a key for indexing into its data structures. If a port is deleted then re-added under the same protocol port, CAS treats the change as a SET to the portNum attribute.

This attribute specifies the media type the frame must be in before it is to be forwarded over the outbound supported WAN Bridge Protocol Port. The attribute only applies to outbound Bridge Protocol Port. For supported bridge ports, if the attribute value remains set to the default value of unaltered then there will be no frame conversion. When the value is set to the value ethernetConv then all frames being forwarded out the outbound WAN Port will be converted to ethernet before forwarding takes place. The only outbound WAN medias that currently support conversion are: FR (Frame Relay) and VNS. All other medias will fail the Bridge Port semantic check when attempts are made to alter this attribute. The following is an example of what the user may be able to do. Frames originating from a Token Ring are to be flooded out onto another Token Ring and a Frame Relay Port. The token ring Outbound port performs no translation, yet the FR Port has the outboundFrameMediaType attribute set to ethernetConv which results in the frame being translated into Ethernet format from Token Ring format before Frame Relay does its encapsulation and transmits over the FR port. Enumeration: 'unaltered': 1, 'ethernetConv': 2.

This group houses all the port specific provisionable attributes that belong to the Tb group. The Tb group is only applicable bridge port types that operate in the TB mode. These attributes in part influence the working of a bridge port operating in the TB mode.

An entry in the vrPpTbclTbProvTable.

This attribute specifies whether the port secure feature is enabled. The secure feature, if enabled causes the following things to happen: a) disallows dynamic learning, b) disallows frames to be forwarded that do not satisfy the following condition: the mac address of the source should be found in the forwarding table and the destination mac address of the frame should also be found in the forwarding table. In addition to this, the port the frame was received on should figure as the in port, given the destination mac address found in the frame. c) disallows frames to be forwarded if the allowed to go port map for the destination mac address is empty. This feature in effect allows the user to choose the hosts that can generate traffic and the hosts that can receive traffic through this bridge unit. Enumeration: 'disabled': 0, 'enabled': 1.

This group houses all the port specific provisionable attributes that belong to the Stp group. The Stp group is applicable to all the bridge ports that participate in the spanning tree protocol. These attributes influence the participation of the bridge port in the spanning tree protocol.

An entry in the vrPpTbclStpProvTable.

This attribute defines the current administrative state for this component. enabled indicates that the component is available for operation. disabled indicates the component is unavailable for operation. Enumeration: 'down': 2, 'up': 1.

This attribute specifies whether or not spanning tree protocol state for this bridge port is controlled by the spanning tree protocol. In essence it indicates the participation of this bridge port in the spanning tree protocol, by accepting and acting on received bridge protocol data units and by sending out the same. on signifies that this bridge port's spanning tree port state is controlled by the spanning tree protocol. A value of off signifies that the spanning tree port state of this bridge port is unaffected by the spanning tree protocol. This in effect puts the bridge port out of reach of the spanning tree protocol and in the forwarding state. Care should be taken while assigning a value of off to this attribute, as this might cause network loops. Please do not set this attribute to off unless you are absolutely sure about the effect of such an action on your network topology. Enumeration: 'on': 1, 'off': 0.

This attribute specifies the type of spanning tree protocol the port is participating in. A bridge port could participate in either the ieee8021 spanning tree protocol or the dec spanning tree protocol. If the value of the attribute protocolSpec in the SpanningTreeProtocol component, provisioned under the TransparentBridge component is in conflict with the value of this attribute, the value of the protocolSpec attribute will prevail. Prevailing stp type is reflected in the value of the attribute stpTypeOper. Enumeration: 'dec': 2, 'ieee8021': 3.

This attribute specifies the value for port priority, which is contained in the first octet of the port identifier. Valid values are as follows: 1) 0..255 for stp type DEC and 2) 0..65535 for stp type IEEE.

This attribute specifies the contribution of this port, to all the paths to the root bridge that include this port. Please note that the value of the attribute pathCostMethod is applied only when the value of the attribute pathCostMethod is set to on and is ignored if otherwise.

This attribute specifies the method used by the bridging logic, to calculate the path cost to the bridge considered to be the root bridge in the spanning tree topology. This attribute should be set to off before attempting to provision a value for pathCostProv. Enumeration: 'dec': 2, 'off': 1, 'ieee8021': 3.

This group houses all the provisionable, domain specific attributes for a non-encapsulating bridge port.

An entry in the vrPpTbclDIProvTable.

This attribute specifies the domain number associated with this bridge port. Domain numbers are used for confining frames to a domain. Domain based filtering provides a complete segregation of traffic based on domain number associated with frames. There can exist only sixteen domains when a spanning tree is desired specific to each domain. When there is only a single spanning tree spanning all the domains the maximum number of domains possible are 4294967293. This attribute is of no relevance when associated with backbone bridge port. Its value is ignored in such a situation.

This attribute specifies if the domain information should be preserved or embedded in the frame header. This attribute applies only to backbone ports and does not affect the access bridge ports. By setting this attribute to a value of on, domain information could be preserved in frames being tunnelled across the a backbone, so that this information can be deciphered at the other end of the backbone tunnel. This preserves the integrity of the domains thus preventing domain breaches while tunnelling frames across backbone network. If the value of this attribute is set to off then domain information is not preserved in the header of the frames tunnelling through the backbone. This eliminates the overhead incurred to preserve domain information across the backbone while tunnelling frames across it. Preserve domain is relevant when used in conjunction with the following media: FDDI, ATM MPE, Frame Relay and PPP. It is ignored when used with other types of media. Enumeration: 'on': 1, 'off': 0.

This group contains the three OSI State attributes. The descriptions generically indicate what each state attribute implies about the component. Note that not all the values and state combinations described here are supported by every component which uses this group. For component-specific information and the valid state combinations, refer to NTP 241-7001-150, Passport Operations and Maintenance Guide.

An entry in the vrPpTbclStateTable.

This attribute indicates the OSI Administrative State of the component. The value locked indicates that the component is administratively prohibited from providing services for its users. A Lock or Lock - force command has been previously issued for this component. When the value is locked, the value of usageState must be idle. The value shuttingDown indicates that the component is administratively permitted to provide service to its existing users only. A Lock command was issued against the component and it is in the process of shutting down. The value unlocked indicates that the component is administratively permitted to provide services for its users. To enter this state, issue an Unlock command to this component. Enumeration: 'locked': 0, 'shuttingDown': 2, 'unlocked': 1.

This attribute indicates the OSI Operational State of the component. The value enabled indicates that the component is available for operation. Note that if adminState is locked, it would still not be providing service. The value disabled indicates that the component is not available for operation. For example, something is wrong with the component itself, or with another component on which this one depends. If the value is disabled, the usageState must be idle. Enumeration: 'disabled': 0, 'enabled': 1.

This attribute indicates the OSI Usage State of the component. The value idle indicates that the component is not currently in use. The value active indicates that the component is in use and has spare capacity to provide for additional users. The value busy indicates that the component is in use and has no spare operating capacity for additional users at this time. Enumeration: 'active': 1, 'idle': 0, 'busy': 2.

This group includes the Operational Status attribute. This attribute defines the current operational state of this component.

An entry in the vrPpTbclOperStatusTable.

The current state of the interface. The up state indicates the interface is operational and capable of forwarding packets. The down state indicates the interface is not operational, thus unable to forward packets. testing state indicates that no operational packets can be passed. Enumeration: 'down': 2, 'testing': 3, 'up': 1.

This group houses all the operational attributes belonging to the base group. The base group of attributes is applicable to all types of bridge ports and represent the common factor between them. These attributes in part, reflect the state of a bridge port.

An entry in the vrPpTbclOperTable.

The attribute portName is a string of the form 'BridgePortName-i', where BridgePortName is the abbreviation of the corresponding bridge port and i is the instance identifier of the ProtocolPort, the bridge port is provisioned under. For example a TransparentBridgePort provisioned under ProtocolPort/myport would have a name TBP-myport.

This attribute specifies the accumulated up time of this bridge port since the last reset occurred.

This attribute specifies the accumulated down time of this bridge port since the last reset occurred.

This attribute specifies the mode of bridging this port can support. It in turn implies the format of frames, this bridge port can process and forward. Enumeration: 'unknown': 1, 'tb': 2, 'srt': 4, 'sr': 3.

This attribute specifies the bridge port's configuration. It indicates if the bridge port is operating as an access port or as a backbone port. An access bridge port does not encapsulate a MAC frame and does not preserve domain information in the encapsulation, whereas a backbone bridge port encapsulates the MAC frame and optionally preserves domain information in the encapsulated frame.A backbone bridge port is typically used to transport frames across a high bandwidth backbone network to another bridge unit for further processing/forwarding of the frame. Enumeration: 'access': 1, 'backbone': 2.

This attribute specifies the type of bridge port that was provisioned. It takes into consideration the bridgingMode, bridgePortConfig and the media the bridge port is linked to before branding a bridge port. Enumeration: 'fddiBridgePort': 2, 'ethernetBridgePort': 0, 'snaDlrBridgePort': 21, 'clusterTbBridgePort': 18, 'lanEmulationClientEthernet': 22, 'frameRelayBridgePort': 6, 'srtbBridgePort': 15, 'srEncapSrBridgePort': 11, 'tbsrBridgePort': 16, 'unknown': 19, 'vcpBridgePort': 9, 'clusterSrBridgePort': 17, 'srEncapTbBridgePort': 12, 'fddiEncapsulatingBridgePort': 4, 'sourceGateSrBridgePort': 13, 'sourceGateTbBridgePort': 14, 'x25BridgePort': 10, 'smdsBridgePort': 8, 'tokenRingBridgePort': 1, 'tokenBusBridgePort': 3, 'vnsBridgePort': 5, 'atmMpeBridgePort': 20, 'pppBridgePort': 7.

This attribute specifies the index into the Interface Table where in information about the media interface corresponding to the bridge port is maintained.

This attribute is indicative of the number of frames that were discarded because the time taken to process these frames exceeded the transit delay allowed for this bridge unit. This attribute is not supported by bridging and will always have a value of 0.

This attribute is indicative of the number of frames discarded because the size of the out bound frame exceeded the message transfer unit (mtu) allowed for the bridge port. Note that this counter only refers to the outbound frames for this bridge port. This counter wraps around its maximum value of 4294967295. This counter is influenced by the attribute fragmentIp. This counter is incremented when the a frame larger than the mtu allowed is encountered and cannot be fragmented. If this counter is increasing steadily, it might be useful to set the value of the attribute fragmentIp to a value of on.

This group houses all the port specific operational attributes that belong to the Tb group. This group also houses all the port specific statistical attributes that belong to the Tb group. The Tb group is only applicable bridge port types that operate in the TB mode. These attributes reflect the state of a bridge port operating in the TB mode

An entry in the vrPpTbclTbOperTable.

This attribute specifies the maximum size of the information field in a TB frame. This excludes the header field.

This attribute is indicative of the number of incoming frames that were discarded because: a) the value of the secureOption attribute was set to on and b) it is not allowed to receive frames originating from the mac address found in the source address field of the frame (source mac address look up in the forwarding table failed.) on this bridge port. c) for the destination mac address found in the frame, the port the frame was received on does not appear as in port in the corresponding static table entry. Permission to receive frames from a mac address is granted via the static table entries. This attribute, badVerifyDiscards, is directly influenced by: 1. secureOption and 2. the static table entries. This counter wraps around its maximum value of 4294967295.

This attribute is indicative of the number frames discarded because the MAC address found in the destination field did not match the local MAC address of the bridge port. This counter is only applicable for the protocols that are being routed currently.This counter wraps around its maximum value of 4294967295.

This attribute is indicative of the number of frames that were discarded because of the following two reasons: a) there was no entry for the 'allowed to go' field in the static table entry, where the input port is this bridge port. b) for spanning tree bpdus that are locally processed. This counter wraps around its maximum value of 4294967295. It might prove useful to check the static table entry corresponding to the bridge port in question, if this counter consistently displays a high value. Ideally this counter should be as low as possible.

This attribute is indicative of the number of incoming frames that a) were discarded because of the fact that the bridge port, the frame is to go out of matches the bridge port it came in from or b) if the stp port state of the out port is not forwarding. This counter wraps around its maximum value of 4294967295.

This attribute is indicative of the number of frames that were discarded while this bridge port was in a state other than the forwarding state. While in learning state the frame is discarded after the information from its header is learnt. This counter wraps around its maximum value of 4294967295.

This attribute is indicative of the number of frames that were received by this bridge port and were discarded by the forwarding process. This includes frames that could have been discarded due to filtering. A repidly increasing value for this attribute could indicate a shrtage of resource in terms of memory needed to process the incoming frames. More memory can be provisioned through the VirtualRouter's memory manager.

This attribute is indicative of the number of frames that have been received by this port from its segment. Note that a frame received on this bridge port is counted if and only if it can be processed by the bridge logic contained in this bridge unit, a protocol that can be processed by the bridge logic. This counter wraps around its maximum value of 4294967295.

This attribute is indicative of the number of frames that have been transmitted out this bridge port. Note that frame transmitted out this bridge port is counted if and only if it is for a protocol being processed by the bridge unit. This also includes management frames.This counter wraps around its maximum value of 4294967295.

This group houses all the port specific operational attributes that belong to the Stp group. The Stp group is applicable to all the bridge ports that participate in the spanning tree protocol. These attributes reflect the state of the bridge port's participation in the spanning tree protocol.

An entry in the vrPpTbclStpOperTable.

This attribute specifies the spanning tree protocol state of the bridge port. Enumeration: 'listening': 3, 'disabled': 1, 'broken': 6, 'learning': 4, 'forwarding': 5, 'blocking': 2.

This attribute specifies the type of spanning tree protocol the port is participating in. A bridge port could participate in either the ieee8021 spanning tree protocol or the dec spanning tree protocol. Enumeration: 'none': 0, 'dec': 2, 'ieee8021': 3.

This attribute specifies the path cost of the designated port of the lan segment connected to the port.

This attribute specifies the contribution of this port, to all the paths to the root bridge that include this port. This attribute pathCostOper will track the value of the attribute pathCostProv when the value of the attribute pathCostMethod is set of off.

This attribute specifies the identifier of the bridge that this port considers to be the designated bridge.

This attribute specifies the port identifier of the port on the designated bridge, attached to the same lan as this port is attached to.

This attribute is indicative of the number of times this bridge port transitioned from the learning state to the forwarding state. This counter wraps around its maximum value of 4294967295. A rapidly increasing value might be indicative of an unstable spanning tree topology.

This attribute is indicative of the number of incoming frames that were discarded because the bridge port was in the blocking state. This counter wraps around its maximum value of 4294967295.

This attribute specifies the bridge identifier of the bridge recorded as the root bridge, in the configuration BPDUs sent out by the designated bridge on the segment to which the port is attached.

This group houses all the statistical attributes applicable to all types of bridge ports and represents the common factor between them. These attributes in part reflect the state of the bridge port.

An entry in the vrPpTbclStatsTable.

This attribute is indicative of the number of frames that were discarded because the data that was abstracted, from frames coming in through this bridge port, did not conform to the format expected by the bridge logic.This counter wraps around its maximum value of 4294967295.

This attribute is indicative of the number of frames received on this bridge port that used the tinygram compression scheme.

This attribute is indicative of the number of frames transmitted out this bridge port that used the tinygram compression scheme.

This attribute is indicative of the number of frames discarded at the in filter point. This includes a) frames discarded due to application of the filter defined with PCF for the in filter point and b) the frames discarded due to domain based filtering at the in filter point. This counter wraps around its maximum value of 4294967295.

This attribute is indicative of the number of frames discarded at the out filter point. This includes: a) frames discarded due to application of the filter defined with PCF for the out filter point and b) the frames discarded due to domain based filtering at the out filter point. This counter wraps around its maximum value of 4294967295.

This entry controls the addition and deletion of vrPpFddiETB components.

A single entry in the table represents a single vrPpFddiETB component.

This variable is used as the basis for SNMP naming of vrPpFddiETB components. These components can be added and deleted.

This variable provides the component's string name for use with the ASCII Console Interface

This variable represents the storage type value for the vrPpFddiETB tables.

This variable represents the index for the vrPpFddiETB tables.

This entry controls the addition and deletion of vrPpFddiETBNs components.

A single entry in the table represents a single vrPpFddiETBNs component.

This variable is used as the basis for SNMP naming of vrPpFddiETBNs components. These components can be added and deleted.

This variable provides the component's string name for use with the ASCII Console Interface

This variable represents the storage type value for the vrPpFddiETBNs tables.

This variable represents the index for the vrPpFddiETBNs tables.

This group houses all the port specific provisionable attributes associated with Ns. These attributes influence the application of filters to incoming and outgoing frames.

An entry in the vrPpFddiETBNsProvTable.

This attribute specifies the name of the filter to be applied at the incoming filter point.

This attribute specifies the name of the filter to be applied at the out going filter point.

This group houses all the provisionable attributes that belong to the this group. This group of attributes is applicable to all types of bridge ports and represent the common factor between them. These attributes influence the working of a bridge port.

An entry in the vrPpFddiETBProvTable.

This attribute specifies the type of translation to be performed on frames carrying IPX packets. Ethernet frames carrying IPX payload could be translated to IEEE 802.3 frames (with the same IPX payload) or vice- versa. The main reason to do so is to allow the bridge unit to consistently forward one type of frames carrying IPX packets. Translations can be turned off altogether in which case the IPX frames will pass through the bridge unit unchanged. Enumeration: 'snap': 3, 'ethernet': 2, 'sap': 4, 'off': 0, 'ieee8023': 1.

This attribute specifies if or not outbound frames carrying IP datagrams should be fragmented to conform to message transfer unit (mtu) sizes dictated by the media. Enumeration: 'on': 1, 'off': 0.

This attribute specifies if the frames should be ordered or not before they are transmitted through a bridge port. If this attribute has a value of ordered the received frames are ordered as in the original message, before they are transmitted out through a bridge port. If it has a value of notOrdered, received then frames pass through the bridge unit in the order they are received. This feature can be used over multiple telecommunication links to increase data flow. Please note that this attribute only affects link protocols and is ineffective with lan media. Enumeration: 'notOrdered': 1, 'ordered': 0.

This attribute is indicative of the state of the MAC address format conversion process for ARP/RARP frames. The MAC addresses may be translated if need be from a canonical format to a non-canonical format, based on the needs of the associated media. If this attribute is set to a value of on then all Mac addresses will converted if need be to suit the format of mac address, the outgoing media will support. If this attribute is set to a value of off no such conversion takes place. Enumeration: 'on': 1, 'off': 0.

This attribute is indicative of the unique number assigned to the bridge port. It is used for SNMP management of this bridge port and in spanning tree as an identifier this bridge port. Notes regarding portNum: Escape routines exist for initializing, copying, and deleting port numbers. This is necessary because SNMP requires a unique port instance identifier. The initPortNum escape routine sets the port number to a value in the range 1-255 for this purpose. The setCopiedPortNum escape routine exists to maintain the uniqueness of the port number in cases when one port is copied to another. When a bridge port is deleted, the releasePortNum escape routine places the port number being released into a pending deletion state. This is because the port number cannot be re-allocated until the port is truely deleted in the current view. This is necessary since there is no guarantee of order when processing changes to multiple protocol ports so without the pending deletion state, the same port number could be temporarily assigned to two ports for a short period of time. The portNum is set as component critical since bridging also uses the port number as a key for indexing into its data structures. If a port is deleted then re-added under the same protocol port, CAS treats the change as a SET to the portNum attribute.

This attribute specifies the media type the frame must be in before it is to be forwarded over the outbound supported WAN Bridge Protocol Port. The attribute only applies to outbound Bridge Protocol Port. For supported bridge ports, if the attribute value remains set to the default value of unaltered then there will be no frame conversion. When the value is set to the value ethernetConv then all frames being forwarded out the outbound WAN Port will be converted to ethernet before forwarding takes place. The only outbound WAN medias that currently support conversion are: FR (Frame Relay) and VNS. All other medias will fail the Bridge Port semantic check when attempts are made to alter this attribute. The following is an example of what the user may be able to do. Frames originating from a Token Ring are to be flooded out onto another Token Ring and a Frame Relay Port. The token ring Outbound port performs no translation, yet the FR Port has the outboundFrameMediaType attribute set to ethernetConv which results in the frame being translated into Ethernet format from Token Ring format before Frame Relay does its encapsulation and transmits over the FR port. Enumeration: 'unaltered': 1, 'ethernetConv': 2.

This group houses all the port specific provisionable attributes that belong to the Tb group. The Tb group is only applicable bridge port types that operate in the TB mode. These attributes in part influence the working of a bridge port operating in the TB mode.

An entry in the vrPpFddiETBTbProvTable.

This attribute specifies whether the port secure feature is enabled. The secure feature, if enabled causes the following things to happen: a) disallows dynamic learning, b) disallows frames to be forwarded that do not satisfy the following condition: the mac address of the source should be found in the forwarding table and the destination mac address of the frame should also be found in the forwarding table. In addition to this, the port the frame was received on should figure as the in port, given the destination mac address found in the frame. c) disallows frames to be forwarded if the allowed to go port map for the destination mac address is empty. This feature in effect allows the user to choose the hosts that can generate traffic and the hosts that can receive traffic through this bridge unit. Enumeration: 'disabled': 0, 'enabled': 1.

This group houses all the port specific provisionable attributes that belong to the Stp group. The Stp group is applicable to all the bridge ports that participate in the spanning tree protocol. These attributes influence the participation of the bridge port in the spanning tree protocol.

An entry in the vrPpFddiETBStpProvTable.

This attribute defines the current administrative state for this component. enabled indicates that the component is available for operation. disabled indicates the component is unavailable for operation. Enumeration: 'down': 2, 'up': 1.

This attribute specifies whether or not spanning tree protocol state for this bridge port is controlled by the spanning tree protocol. In essence it indicates the participation of this bridge port in the spanning tree protocol, by accepting and acting on received bridge protocol data units and by sending out the same. on signifies that this bridge port's spanning tree port state is controlled by the spanning tree protocol. A value of off signifies that the spanning tree port state of this bridge port is unaffected by the spanning tree protocol. This in effect puts the bridge port out of reach of the spanning tree protocol and in the forwarding state. Care should be taken while assigning a value of off to this attribute, as this might cause network loops. Please do not set this attribute to off unless you are absolutely sure about the effect of such an action on your network topology. Enumeration: 'on': 1, 'off': 0.

This attribute specifies the type of spanning tree protocol the port is participating in. A bridge port could participate in either the ieee8021 spanning tree protocol or the dec spanning tree protocol. If the value of the attribute protocolSpec in the SpanningTreeProtocol component, provisioned under the TransparentBridge component is in conflict with the value of this attribute, the value of the protocolSpec attribute will prevail. Prevailing stp type is reflected in the value of the attribute stpTypeOper. Enumeration: 'dec': 2, 'ieee8021': 3.

This attribute specifies the value for port priority, which is contained in the first octet of the port identifier. Valid values are as follows: 1) 0..255 for stp type DEC and 2) 0..65535 for stp type IEEE.

This attribute specifies the contribution of this port, to all the paths to the root bridge that include this port. Please note that the value of the attribute pathCostMethod is applied only when the value of the attribute pathCostMethod is set to on and is ignored if otherwise.

This attribute specifies the method used by the bridging logic, to calculate the path cost to the bridge considered to be the root bridge in the spanning tree topology. This attribute should be set to off before attempting to provision a value for pathCostProv. Enumeration: 'dec': 2, 'off': 1, 'ieee8021': 3.

This group houses all the provisionable, domain specific attributes for a non-encapsulating bridge port.

An entry in the vrPpFddiETBDIProvTable.

This attribute specifies the domain number associated with this bridge port. Domain numbers are used for confining frames to a domain. Domain based filtering provides a complete segregation of traffic based on domain number associated with frames. There can exist only sixteen domains when a spanning tree is desired specific to each domain. When there is only a single spanning tree spanning all the domains the maximum number of domains possible are 4294967293. This attribute is of no relevance when associated with backbone bridge port. Its value is ignored in such a situation.

This attribute specifies if the domain information should be preserved or embedded in the frame header. This attribute applies only to backbone ports and does not affect the access bridge ports. By setting this attribute to a value of on, domain information could be preserved in frames being tunnelled across the a backbone, so that this information can be deciphered at the other end of the backbone tunnel. This preserves the integrity of the domains thus preventing domain breaches while tunnelling frames across backbone network. If the value of this attribute is set to off then domain information is not preserved in the header of the frames tunnelling through the backbone. This eliminates the overhead incurred to preserve domain information across the backbone while tunnelling frames across it. Preserve domain is relevant when used in conjunction with the following media: FDDI, ATM MPE, Frame Relay and PPP. It is ignored when used with other types of media. Enumeration: 'on': 1, 'off': 0.

This group contains the three OSI State attributes. The descriptions generically indicate what each state attribute implies about the component. Note that not all the values and state combinations described here are supported by every component which uses this group. For component-specific information and the valid state combinations, refer to NTP 241-7001-150, Passport Operations and Maintenance Guide.

An entry in the vrPpFddiETBStateTable.

This attribute indicates the OSI Administrative State of the component. The value locked indicates that the component is administratively prohibited from providing services for its users. A Lock or Lock - force command has been previously issued for this component. When the value is locked, the value of usageState must be idle. The value shuttingDown indicates that the component is administratively permitted to provide service to its existing users only. A Lock command was issued against the component and it is in the process of shutting down. The value unlocked indicates that the component is administratively permitted to provide services for its users. To enter this state, issue an Unlock command to this component. Enumeration: 'locked': 0, 'shuttingDown': 2, 'unlocked': 1.

This attribute indicates the OSI Operational State of the component. The value enabled indicates that the component is available for operation. Note that if adminState is locked, it would still not be providing service. The value disabled indicates that the component is not available for operation. For example, something is wrong with the component itself, or with another component on which this one depends. If the value is disabled, the usageState must be idle. Enumeration: 'disabled': 0, 'enabled': 1.

This attribute indicates the OSI Usage State of the component. The value idle indicates that the component is not currently in use. The value active indicates that the component is in use and has spare capacity to provide for additional users. The value busy indicates that the component is in use and has no spare operating capacity for additional users at this time. Enumeration: 'active': 1, 'idle': 0, 'busy': 2.

This group includes the Operational Status attribute. This attribute defines the current operational state of this component.

An entry in the vrPpFddiETBOperStatusTable.

The current state of the interface. The up state indicates the interface is operational and capable of forwarding packets. The down state indicates the interface is not operational, thus unable to forward packets. testing state indicates that no operational packets can be passed. Enumeration: 'down': 2, 'testing': 3, 'up': 1.

This group houses all the operational attributes belonging to the base group. The base group of attributes is applicable to all types of bridge ports and represent the common factor between them. These attributes in part, reflect the state of a bridge port.

An entry in the vrPpFddiETBOperTable.

The attribute portName is a string of the form 'BridgePortName-i', where BridgePortName is the abbreviation of the corresponding bridge port and i is the instance identifier of the ProtocolPort, the bridge port is provisioned under. For example a TransparentBridgePort provisioned under ProtocolPort/myport would have a name TBP-myport.

This attribute specifies the accumulated up time of this bridge port since the last reset occurred.

This attribute specifies the accumulated down time of this bridge port since the last reset occurred.

This attribute specifies the mode of bridging this port can support. It in turn implies the format of frames, this bridge port can process and forward. Enumeration: 'unknown': 1, 'tb': 2, 'srt': 4, 'sr': 3.

This attribute specifies the bridge port's configuration. It indicates if the bridge port is operating as an access port or as a backbone port. An access bridge port does not encapsulate a MAC frame and does not preserve domain information in the encapsulation, whereas a backbone bridge port encapsulates the MAC frame and optionally preserves domain information in the encapsulated frame.A backbone bridge port is typically used to transport frames across a high bandwidth backbone network to another bridge unit for further processing/forwarding of the frame. Enumeration: 'access': 1, 'backbone': 2.

This attribute specifies the type of bridge port that was provisioned. It takes into consideration the bridgingMode, bridgePortConfig and the media the bridge port is linked to before branding a bridge port. Enumeration: 'fddiBridgePort': 2, 'ethernetBridgePort': 0, 'snaDlrBridgePort': 21, 'clusterTbBridgePort': 18, 'lanEmulationClientEthernet': 22, 'frameRelayBridgePort': 6, 'srtbBridgePort': 15, 'srEncapSrBridgePort': 11, 'tbsrBridgePort': 16, 'unknown': 19, 'vcpBridgePort': 9, 'clusterSrBridgePort': 17, 'srEncapTbBridgePort': 12, 'fddiEncapsulatingBridgePort': 4, 'sourceGateSrBridgePort': 13, 'sourceGateTbBridgePort': 14, 'x25BridgePort': 10, 'smdsBridgePort': 8, 'tokenRingBridgePort': 1, 'tokenBusBridgePort': 3, 'vnsBridgePort': 5, 'atmMpeBridgePort': 20, 'pppBridgePort': 7.

This attribute specifies the index into the Interface Table where in information about the media interface corresponding to the bridge port is maintained.

This attribute is indicative of the number of frames that were discarded because the time taken to process these frames exceeded the transit delay allowed for this bridge unit. This attribute is not supported by bridging and will always have a value of 0.

This attribute is indicative of the number of frames discarded because the size of the out bound frame exceeded the message transfer unit (mtu) allowed for the bridge port. Note that this counter only refers to the outbound frames for this bridge port. This counter wraps around its maximum value of 4294967295. This counter is influenced by the attribute fragmentIp. This counter is incremented when the a frame larger than the mtu allowed is encountered and cannot be fragmented. If this counter is increasing steadily, it might be useful to set the value of the attribute fragmentIp to a value of on.

This group houses all the port specific operational attributes that belong to the Tb group. This group also houses all the port specific statistical attributes that belong to the Tb group. The Tb group is only applicable bridge port types that operate in the TB mode. These attributes reflect the state of a bridge port operating in the TB mode

An entry in the vrPpFddiETBTbOperTable.

This attribute specifies the maximum size of the information field in a TB frame. This excludes the header field.

This attribute is indicative of the number of incoming frames that were discarded because: a) the value of the secureOption attribute was set to on and b) it is not allowed to receive frames originating from the mac address found in the source address field of the frame (source mac address look up in the forwarding table failed.) on this bridge port. c) for the destination mac address found in the frame, the port the frame was received on does not appear as in port in the corresponding static table entry. Permission to receive frames from a mac address is granted via the static table entries. This attribute, badVerifyDiscards, is directly influenced by: 1. secureOption and 2. the static table entries. This counter wraps around its maximum value of 4294967295.

This attribute is indicative of the number frames discarded because the MAC address found in the destination field did not match the local MAC address of the bridge port. This counter is only applicable for the protocols that are being routed currently.This counter wraps around its maximum value of 4294967295.

This attribute is indicative of the number of frames that were discarded because of the following two reasons: a) there was no entry for the 'allowed to go' field in the static table entry, where the input port is this bridge port. b) for spanning tree bpdus that are locally processed. This counter wraps around its maximum value of 4294967295. It might prove useful to check the static table entry corresponding to the bridge port in question, if this counter consistently displays a high value. Ideally this counter should be as low as possible.

This attribute is indicative of the number of incoming frames that a) were discarded because of the fact that the bridge port, the frame is to go out of matches the bridge port it came in from or b) if the stp port state of the out port is not forwarding. This counter wraps around its maximum value of 4294967295.

This attribute is indicative of the number of frames that were discarded while this bridge port was in a state other than the forwarding state. While in learning state the frame is discarded after the information from its header is learnt. This counter wraps around its maximum value of 4294967295.

This attribute is indicative of the number of frames that were received by this bridge port and were discarded by the forwarding process. This includes frames that could have been discarded due to filtering. A repidly increasing value for this attribute could indicate a shrtage of resource in terms of memory needed to process the incoming frames. More memory can be provisioned through the VirtualRouter's memory manager.

This attribute is indicative of the number of frames that have been received by this port from its segment. Note that a frame received on this bridge port is counted if and only if it can be processed by the bridge logic contained in this bridge unit, a protocol that can be processed by the bridge logic. This counter wraps around its maximum value of 4294967295.

This attribute is indicative of the number of frames that have been transmitted out this bridge port. Note that frame transmitted out this bridge port is counted if and only if it is for a protocol being processed by the bridge unit. This also includes management frames.This counter wraps around its maximum value of 4294967295.

This group houses all the port specific operational attributes that belong to the Stp group. The Stp group is applicable to all the bridge ports that participate in the spanning tree protocol. These attributes reflect the state of the bridge port's participation in the spanning tree protocol.

An entry in the vrPpFddiETBStpOperTable.

This attribute specifies the spanning tree protocol state of the bridge port. Enumeration: 'listening': 3, 'disabled': 1, 'broken': 6, 'learning': 4, 'forwarding': 5, 'blocking': 2.

This attribute specifies the type of spanning tree protocol the port is participating in. A bridge port could participate in either the ieee8021 spanning tree protocol or the dec spanning tree protocol. Enumeration: 'none': 0, 'dec': 2, 'ieee8021': 3.

This attribute specifies the path cost of the designated port of the lan segment connected to the port.

This attribute specifies the contribution of this port, to all the paths to the root bridge that include this port. This attribute pathCostOper will track the value of the attribute pathCostProv when the value of the attribute pathCostMethod is set of off.

This attribute specifies the identifier of the bridge that this port considers to be the designated bridge.

This attribute specifies the port identifier of the port on the designated bridge, attached to the same lan as this port is attached to.

This attribute is indicative of the number of times this bridge port transitioned from the learning state to the forwarding state. This counter wraps around its maximum value of 4294967295. A rapidly increasing value might be indicative of an unstable spanning tree topology.

This attribute is indicative of the number of incoming frames that were discarded because the bridge port was in the blocking state. This counter wraps around its maximum value of 4294967295.

This attribute specifies the bridge identifier of the bridge recorded as the root bridge, in the configuration BPDUs sent out by the designated bridge on the segment to which the port is attached.

This group houses all the statistical attributes applicable to all types of bridge ports and represents the common factor between them. These attributes in part reflect the state of the bridge port.

An entry in the vrPpFddiETBStatsTable.

This attribute is indicative of the number of frames that were discarded because the data that was abstracted, from frames coming in through this bridge port, did not conform to the format expected by the bridge logic.This counter wraps around its maximum value of 4294967295.

This attribute is indicative of the number of frames received on this bridge port that used the tinygram compression scheme.

This attribute is indicative of the number of frames transmitted out this bridge port that used the tinygram compression scheme.

This attribute is indicative of the number of frames discarded at the in filter point. This includes a) frames discarded due to application of the filter defined with PCF for the in filter point and b) the frames discarded due to domain based filtering at the in filter point. This counter wraps around its maximum value of 4294967295.

This attribute is indicative of the number of frames discarded at the out filter point. This includes: a) frames discarded due to application of the filter defined with PCF for the out filter point and b) the frames discarded due to domain based filtering at the out filter point. This counter wraps around its maximum value of 4294967295.

This entry controls the addition and deletion of vrPpTbp components.

A single entry in the table represents a single vrPpTbp component.

This variable is used as the basis for SNMP naming of vrPpTbp components. These components can be added and deleted.

This variable provides the component's string name for use with the ASCII Console Interface

This variable represents the storage type value for the vrPpTbp tables.

This variable represents the index for the vrPpTbp tables.

This entry controls the addition and deletion of vrPpTbpNs components.

A single entry in the table represents a single vrPpTbpNs component.

This variable is used as the basis for SNMP naming of vrPpTbpNs components. These components can be added and deleted.

This variable provides the component's string name for use with the ASCII Console Interface

This variable represents the storage type value for the vrPpTbpNs tables.

This variable represents the index for the vrPpTbpNs tables.

This group houses all the port specific provisionable attributes associated with Ns. These attributes influence the application of filters to incoming and outgoing frames.

An entry in the vrPpTbpNsProvTable.

This attribute specifies the name of the filter to be applied at the incoming filter point.

This attribute specifies the name of the filter to be applied at the out going filter point.

This group houses all the provisionable attributes that belong to the this group. This group of attributes is applicable to all types of bridge ports and represent the common factor between them. These attributes influence the working of a bridge port.

An entry in the vrPpTbpProvTable.

This attribute specifies the type of translation to be performed on frames carrying IPX packets. Ethernet frames carrying IPX payload could be translated to IEEE 802.3 frames (with the same IPX payload) or vice- versa. The main reason to do so is to allow the bridge unit to consistently forward one type of frames carrying IPX packets. Translations can be turned off altogether in which case the IPX frames will pass through the bridge unit unchanged. Enumeration: 'snap': 3, 'ethernet': 2, 'sap': 4, 'off': 0, 'ieee8023': 1.

This attribute specifies if or not outbound frames carrying IP datagrams should be fragmented to conform to message transfer unit (mtu) sizes dictated by the media. Enumeration: 'on': 1, 'off': 0.

This attribute specifies if the frames should be ordered or not before they are transmitted through a bridge port. If this attribute has a value of ordered the received frames are ordered as in the original message, before they are transmitted out through a bridge port. If it has a value of notOrdered, received then frames pass through the bridge unit in the order they are received. This feature can be used over multiple telecommunication links to increase data flow. Please note that this attribute only affects link protocols and is ineffective with lan media. Enumeration: 'notOrdered': 1, 'ordered': 0.

This attribute is indicative of the state of the MAC address format conversion process for ARP/RARP frames. The MAC addresses may be translated if need be from a canonical format to a non-canonical format, based on the needs of the associated media. If this attribute is set to a value of on then all Mac addresses will converted if need be to suit the format of mac address, the outgoing media will support. If this attribute is set to a value of off no such conversion takes place. Enumeration: 'on': 1, 'off': 0.

This attribute is indicative of the unique number assigned to the bridge port. It is used for SNMP management of this bridge port and in spanning tree as an identifier this bridge port. Notes regarding portNum: Escape routines exist for initializing, copying, and deleting port numbers. This is necessary because SNMP requires a unique port instance identifier. The initPortNum escape routine sets the port number to a value in the range 1-255 for this purpose. The setCopiedPortNum escape routine exists to maintain the uniqueness of the port number in cases when one port is copied to another. When a bridge port is deleted, the releasePortNum escape routine places the port number being released into a pending deletion state. This is because the port number cannot be re-allocated until the port is truely deleted in the current view. This is necessary since there is no guarantee of order when processing changes to multiple protocol ports so without the pending deletion state, the same port number could be temporarily assigned to two ports for a short period of time. The portNum is set as component critical since bridging also uses the port number as a key for indexing into its data structures. If a port is deleted then re-added under the same protocol port, CAS treats the change as a SET to the portNum attribute.

This attribute specifies the media type the frame must be in before it is to be forwarded over the outbound supported WAN Bridge Protocol Port. The attribute only applies to outbound Bridge Protocol Port. For supported bridge ports, if the attribute value remains set to the default value of unaltered then there will be no frame conversion. When the value is set to the value ethernetConv then all frames being forwarded out the outbound WAN Port will be converted to ethernet before forwarding takes place. The only outbound WAN medias that currently support conversion are: FR (Frame Relay) and VNS. All other medias will fail the Bridge Port semantic check when attempts are made to alter this attribute. The following is an example of what the user may be able to do. Frames originating from a Token Ring are to be flooded out onto another Token Ring and a Frame Relay Port. The token ring Outbound port performs no translation, yet the FR Port has the outboundFrameMediaType attribute set to ethernetConv which results in the frame being translated into Ethernet format from Token Ring format before Frame Relay does its encapsulation and transmits over the FR port. Enumeration: 'unaltered': 1, 'ethernetConv': 2.

This group houses all the port specific provisionable attributes that belong to the Tb group. The Tb group is only applicable bridge port types that operate in the TB mode. These attributes in part influence the working of a bridge port operating in the TB mode.

An entry in the vrPpTbpTbProvTable.

This attribute specifies whether the port secure feature is enabled. The secure feature, if enabled causes the following things to happen: a) disallows dynamic learning, b) disallows frames to be forwarded that do not satisfy the following condition: the mac address of the source should be found in the forwarding table and the destination mac address of the frame should also be found in the forwarding table. In addition to this, the port the frame was received on should figure as the in port, given the destination mac address found in the frame. c) disallows frames to be forwarded if the allowed to go port map for the destination mac address is empty. This feature in effect allows the user to choose the hosts that can generate traffic and the hosts that can receive traffic through this bridge unit. Enumeration: 'disabled': 0, 'enabled': 1.

This group houses all the port specific provisionable attributes that belong to the Stp group. The Stp group is applicable to all the bridge ports that participate in the spanning tree protocol. These attributes influence the participation of the bridge port in the spanning tree protocol.

An entry in the vrPpTbpStpProvTable.

This attribute defines the current administrative state for this component. enabled indicates that the component is available for operation. disabled indicates the component is unavailable for operation. Enumeration: 'down': 2, 'up': 1.

This attribute specifies whether or not spanning tree protocol state for this bridge port is controlled by the spanning tree protocol. In essence it indicates the participation of this bridge port in the spanning tree protocol, by accepting and acting on received bridge protocol data units and by sending out the same. on signifies that this bridge port's spanning tree port state is controlled by the spanning tree protocol. A value of off signifies that the spanning tree port state of this bridge port is unaffected by the spanning tree protocol. This in effect puts the bridge port out of reach of the spanning tree protocol and in the forwarding state. Care should be taken while assigning a value of off to this attribute, as this might cause network loops. Please do not set this attribute to off unless you are absolutely sure about the effect of such an action on your network topology. Enumeration: 'on': 1, 'off': 0.

This attribute specifies the type of spanning tree protocol the port is participating in. A bridge port could participate in either the ieee8021 spanning tree protocol or the dec spanning tree protocol. If the value of the attribute protocolSpec in the SpanningTreeProtocol component, provisioned under the TransparentBridge component is in conflict with the value of this attribute, the value of the protocolSpec attribute will prevail. Prevailing stp type is reflected in the value of the attribute stpTypeOper. Enumeration: 'dec': 2, 'ieee8021': 3.

This attribute specifies the value for port priority, which is contained in the first octet of the port identifier. Valid values are as follows: 1) 0..255 for stp type DEC and 2) 0..65535 for stp type IEEE.

This attribute specifies the contribution of this port, to all the paths to the root bridge that include this port. Please note that the value of the attribute pathCostMethod is applied only when the value of the attribute pathCostMethod is set to on and is ignored if otherwise.

This attribute specifies the method used by the bridging logic, to calculate the path cost to the bridge considered to be the root bridge in the spanning tree topology. This attribute should be set to off before attempting to provision a value for pathCostProv. Enumeration: 'dec': 2, 'off': 1, 'ieee8021': 3.

This group houses all the provisionable, domain specific attributes for a non-encapsulating bridge port.

An entry in the vrPpTbpDIProvTable.

This attribute specifies the domain number associated with this bridge port. Domain numbers are used for confining frames to a domain. Domain based filtering provides a complete segregation of traffic based on domain number associated with frames. There can exist only sixteen domains when a spanning tree is desired specific to each domain. When there is only a single spanning tree spanning all the domains the maximum number of domains possible are 4294967293. This attribute is of no relevance when associated with backbone bridge port. Its value is ignored in such a situation.

This attribute specifies if the domain information should be preserved or embedded in the frame header. This attribute applies only to backbone ports and does not affect the access bridge ports. By setting this attribute to a value of on, domain information could be preserved in frames being tunnelled across the a backbone, so that this information can be deciphered at the other end of the backbone tunnel. This preserves the integrity of the domains thus preventing domain breaches while tunnelling frames across backbone network. If the value of this attribute is set to off then domain information is not preserved in the header of the frames tunnelling through the backbone. This eliminates the overhead incurred to preserve domain information across the backbone while tunnelling frames across it. Preserve domain is relevant when used in conjunction with the following media: FDDI, ATM MPE, Frame Relay and PPP. It is ignored when used with other types of media. Enumeration: 'on': 1, 'off': 0.

This group contains the three OSI State attributes. The descriptions generically indicate what each state attribute implies about the component. Note that not all the values and state combinations described here are supported by every component which uses this group. For component-specific information and the valid state combinations, refer to NTP 241-7001-150, Passport Operations and Maintenance Guide.

An entry in the vrPpTbpStateTable.

This attribute indicates the OSI Administrative State of the component. The value locked indicates that the component is administratively prohibited from providing services for its users. A Lock or Lock - force command has been previously issued for this component. When the value is locked, the value of usageState must be idle. The value shuttingDown indicates that the component is administratively permitted to provide service to its existing users only. A Lock command was issued against the component and it is in the process of shutting down. The value unlocked indicates that the component is administratively permitted to provide services for its users. To enter this state, issue an Unlock command to this component. Enumeration: 'locked': 0, 'shuttingDown': 2, 'unlocked': 1.

This attribute indicates the OSI Operational State of the component. The value enabled indicates that the component is available for operation. Note that if adminState is locked, it would still not be providing service. The value disabled indicates that the component is not available for operation. For example, something is wrong with the component itself, or with another component on which this one depends. If the value is disabled, the usageState must be idle. Enumeration: 'disabled': 0, 'enabled': 1.

This attribute indicates the OSI Usage State of the component. The value idle indicates that the component is not currently in use. The value active indicates that the component is in use and has spare capacity to provide for additional users. The value busy indicates that the component is in use and has no spare operating capacity for additional users at this time. Enumeration: 'active': 1, 'idle': 0, 'busy': 2.

This group includes the Operational Status attribute. This attribute defines the current operational state of this component.

An entry in the vrPpTbpOperStatusTable.

The current state of the interface. The up state indicates the interface is operational and capable of forwarding packets. The down state indicates the interface is not operational, thus unable to forward packets. testing state indicates that no operational packets can be passed. Enumeration: 'down': 2, 'testing': 3, 'up': 1.

This group houses all the operational attributes belonging to the base group. The base group of attributes is applicable to all types of bridge ports and represent the common factor between them. These attributes in part, reflect the state of a bridge port.

An entry in the vrPpTbpOperTable.

The attribute portName is a string of the form 'BridgePortName-i', where BridgePortName is the abbreviation of the corresponding bridge port and i is the instance identifier of the ProtocolPort, the bridge port is provisioned under. For example a TransparentBridgePort provisioned under ProtocolPort/myport would have a name TBP-myport.

This attribute specifies the accumulated up time of this bridge port since the last reset occurred.

This attribute specifies the accumulated down time of this bridge port since the last reset occurred.

This attribute specifies the mode of bridging this port can support. It in turn implies the format of frames, this bridge port can process and forward. Enumeration: 'unknown': 1, 'tb': 2, 'srt': 4, 'sr': 3.

This attribute specifies the bridge port's configuration. It indicates if the bridge port is operating as an access port or as a backbone port. An access bridge port does not encapsulate a MAC frame and does not preserve domain information in the encapsulation, whereas a backbone bridge port encapsulates the MAC frame and optionally preserves domain information in the encapsulated frame.A backbone bridge port is typically used to transport frames across a high bandwidth backbone network to another bridge unit for further processing/forwarding of the frame. Enumeration: 'access': 1, 'backbone': 2.

This attribute specifies the type of bridge port that was provisioned. It takes into consideration the bridgingMode, bridgePortConfig and the media the bridge port is linked to before branding a bridge port. Enumeration: 'fddiBridgePort': 2, 'ethernetBridgePort': 0, 'snaDlrBridgePort': 21, 'clusterTbBridgePort': 18, 'lanEmulationClientEthernet': 22, 'frameRelayBridgePort': 6, 'srtbBridgePort': 15, 'srEncapSrBridgePort': 11, 'tbsrBridgePort': 16, 'unknown': 19, 'vcpBridgePort': 9, 'clusterSrBridgePort': 17, 'srEncapTbBridgePort': 12, 'fddiEncapsulatingBridgePort': 4, 'sourceGateSrBridgePort': 13, 'sourceGateTbBridgePort': 14, 'x25BridgePort': 10, 'smdsBridgePort': 8, 'tokenRingBridgePort': 1, 'tokenBusBridgePort': 3, 'vnsBridgePort': 5, 'atmMpeBridgePort': 20, 'pppBridgePort': 7.

This attribute specifies the index into the Interface Table where in information about the media interface corresponding to the bridge port is maintained.

This attribute is indicative of the number of frames that were discarded because the time taken to process these frames exceeded the transit delay allowed for this bridge unit. This attribute is not supported by bridging and will always have a value of 0.

This attribute is indicative of the number of frames discarded because the size of the out bound frame exceeded the message transfer unit (mtu) allowed for the bridge port. Note that this counter only refers to the outbound frames for this bridge port. This counter wraps around its maximum value of 4294967295. This counter is influenced by the attribute fragmentIp. This counter is incremented when the a frame larger than the mtu allowed is encountered and cannot be fragmented. If this counter is increasing steadily, it might be useful to set the value of the attribute fragmentIp to a value of on.

This group houses all the port specific operational attributes that belong to the Tb group. This group also houses all the port specific statistical attributes that belong to the Tb group. The Tb group is only applicable bridge port types that operate in the TB mode. These attributes reflect the state of a bridge port operating in the TB mode

An entry in the vrPpTbpTbOperTable.

This attribute specifies the maximum size of the information field in a TB frame. This excludes the header field.

This attribute is indicative of the number of incoming frames that were discarded because: a) the value of the secureOption attribute was set to on and b) it is not allowed to receive frames originating from the mac address found in the source address field of the frame (source mac address look up in the forwarding table failed.) on this bridge port. c) for the destination mac address found in the frame, the port the frame was received on does not appear as in port in the corresponding static table entry. Permission to receive frames from a mac address is granted via the static table entries. This attribute, badVerifyDiscards, is directly influenced by: 1. secureOption and 2. the static table entries. This counter wraps around its maximum value of 4294967295.

This attribute is indicative of the number frames discarded because the MAC address found in the destination field did not match the local MAC address of the bridge port. This counter is only applicable for the protocols that are being routed currently.This counter wraps around its maximum value of 4294967295.

This attribute is indicative of the number of frames that were discarded because of the following two reasons: a) there was no entry for the 'allowed to go' field in the static table entry, where the input port is this bridge port. b) for spanning tree bpdus that are locally processed. This counter wraps around its maximum value of 4294967295. It might prove useful to check the static table entry corresponding to the bridge port in question, if this counter consistently displays a high value. Ideally this counter should be as low as possible.

This attribute is indicative of the number of incoming frames that a) were discarded because of the fact that the bridge port, the frame is to go out of matches the bridge port it came in from or b) if the stp port state of the out port is not forwarding. This counter wraps around its maximum value of 4294967295.

This attribute is indicative of the number of frames that were discarded while this bridge port was in a state other than the forwarding state. While in learning state the frame is discarded after the information from its header is learnt. This counter wraps around its maximum value of 4294967295.

This attribute is indicative of the number of frames that were received by this bridge port and were discarded by the forwarding process. This includes frames that could have been discarded due to filtering. A repidly increasing value for this attribute could indicate a shrtage of resource in terms of memory needed to process the incoming frames. More memory can be provisioned through the VirtualRouter's memory manager.

This attribute is indicative of the number of frames that have been received by this port from its segment. Note that a frame received on this bridge port is counted if and only if it can be processed by the bridge logic contained in this bridge unit, a protocol that can be processed by the bridge logic. This counter wraps around its maximum value of 4294967295.

This attribute is indicative of the number of frames that have been transmitted out this bridge port. Note that frame transmitted out this bridge port is counted if and only if it is for a protocol being processed by the bridge unit. This also includes management frames.This counter wraps around its maximum value of 4294967295.

This group houses all the port specific operational attributes that belong to the Stp group. The Stp group is applicable to all the bridge ports that participate in the spanning tree protocol. These attributes reflect the state of the bridge port's participation in the spanning tree protocol.

An entry in the vrPpTbpStpOperTable.

This attribute specifies the spanning tree protocol state of the bridge port. Enumeration: 'listening': 3, 'disabled': 1, 'broken': 6, 'learning': 4, 'forwarding': 5, 'blocking': 2.

This attribute specifies the type of spanning tree protocol the port is participating in. A bridge port could participate in either the ieee8021 spanning tree protocol or the dec spanning tree protocol. Enumeration: 'none': 0, 'dec': 2, 'ieee8021': 3.

This attribute specifies the path cost of the designated port of the lan segment connected to the port.

This attribute specifies the contribution of this port, to all the paths to the root bridge that include this port. This attribute pathCostOper will track the value of the attribute pathCostProv when the value of the attribute pathCostMethod is set of off.

This attribute specifies the identifier of the bridge that this port considers to be the designated bridge.

This attribute specifies the port identifier of the port on the designated bridge, attached to the same lan as this port is attached to.

This attribute is indicative of the number of times this bridge port transitioned from the learning state to the forwarding state. This counter wraps around its maximum value of 4294967295. A rapidly increasing value might be indicative of an unstable spanning tree topology.

This attribute is indicative of the number of incoming frames that were discarded because the bridge port was in the blocking state. This counter wraps around its maximum value of 4294967295.

This attribute specifies the bridge identifier of the bridge recorded as the root bridge, in the configuration BPDUs sent out by the designated bridge on the segment to which the port is attached.

This group houses all the statistical attributes applicable to all types of bridge ports and represents the common factor between them. These attributes in part reflect the state of the bridge port.

An entry in the vrPpTbpStatsTable.

This attribute is indicative of the number of frames that were discarded because the data that was abstracted, from frames coming in through this bridge port, did not conform to the format expected by the bridge logic.This counter wraps around its maximum value of 4294967295.

This attribute is indicative of the number of frames received on this bridge port that used the tinygram compression scheme.

This attribute is indicative of the number of frames transmitted out this bridge port that used the tinygram compression scheme.

This attribute is indicative of the number of frames discarded at the in filter point. This includes a) frames discarded due to application of the filter defined with PCF for the in filter point and b) the frames discarded due to domain based filtering at the in filter point. This counter wraps around its maximum value of 4294967295.

This attribute is indicative of the number of frames discarded at the out filter point. This includes: a) frames discarded due to application of the filter defined with PCF for the out filter point and b) the frames discarded due to domain based filtering at the out filter point. This counter wraps around its maximum value of 4294967295.

This entry controls the addition and deletion of vrPpSrBp components.

A single entry in the table represents a single vrPpSrBp component.

This variable is used as the basis for SNMP naming of vrPpSrBp components. These components can be added and deleted.

This variable provides the component's string name for use with the ASCII Console Interface

This variable represents the storage type value for the vrPpSrBp tables.

This variable represents the index for the vrPpSrBp tables.

This entry controls the addition and deletion of vrPpSrBpNs components.

A single entry in the table represents a single vrPpSrBpNs component.

This variable is used as the basis for SNMP naming of vrPpSrBpNs components. These components can be added and deleted.

This variable provides the component's string name for use with the ASCII Console Interface

This variable represents the storage type value for the vrPpSrBpNs tables.

This variable represents the index for the vrPpSrBpNs tables.

This group houses all the port specific provisionable attributes associated with Ns. These attributes influence the application of filters to incoming and outgoing frames.

An entry in the vrPpSrBpNsProvTable.

This attribute specifies the name of the filter to be applied at the incoming filter point.

This attribute specifies the name of the filter to be applied at the out going filter point.

This group houses all the provisionable attributes that belong to the this group. This group of attributes is applicable to all types of bridge ports and represent the common factor between them. These attributes influence the working of a bridge port.

An entry in the vrPpSrBpProvTable.

This attribute specifies the type of translation to be performed on frames carrying IPX packets. Ethernet frames carrying IPX payload could be translated to IEEE 802.3 frames (with the same IPX payload) or vice- versa. The main reason to do so is to allow the bridge unit to consistently forward one type of frames carrying IPX packets. Translations can be turned off altogether in which case the IPX frames will pass through the bridge unit unchanged. Enumeration: 'snap': 3, 'ethernet': 2, 'sap': 4, 'off': 0, 'ieee8023': 1.

This attribute specifies if or not outbound frames carrying IP datagrams should be fragmented to conform to message transfer unit (mtu) sizes dictated by the media. Enumeration: 'on': 1, 'off': 0.

This attribute specifies if the frames should be ordered or not before they are transmitted through a bridge port. If this attribute has a value of ordered the received frames are ordered as in the original message, before they are transmitted out through a bridge port. If it has a value of notOrdered, received then frames pass through the bridge unit in the order they are received. This feature can be used over multiple telecommunication links to increase data flow. Please note that this attribute only affects link protocols and is ineffective with lan media. Enumeration: 'notOrdered': 1, 'ordered': 0.

This attribute is indicative of the state of the MAC address format conversion process for ARP/RARP frames. The MAC addresses may be translated if need be from a canonical format to a non-canonical format, based on the needs of the associated media. If this attribute is set to a value of on then all Mac addresses will converted if need be to suit the format of mac address, the outgoing media will support. If this attribute is set to a value of off no such conversion takes place. Enumeration: 'on': 1, 'off': 0.

This attribute is indicative of the unique number assigned to the bridge port. It is used for SNMP management of this bridge port and in spanning tree as an identifier this bridge port. Notes regarding portNum: Escape routines exist for initializing, copying, and deleting port numbers. This is necessary because SNMP requires a unique port instance identifier. The initPortNum escape routine sets the port number to a value in the range 1-255 for this purpose. The setCopiedPortNum escape routine exists to maintain the uniqueness of the port number in cases when one port is copied to another. When a bridge port is deleted, the releasePortNum escape routine places the port number being released into a pending deletion state. This is because the port number cannot be re-allocated until the port is truely deleted in the current view. This is necessary since there is no guarantee of order when processing changes to multiple protocol ports so without the pending deletion state, the same port number could be temporarily assigned to two ports for a short period of time. The portNum is set as component critical since bridging also uses the port number as a key for indexing into its data structures. If a port is deleted then re-added under the same protocol port, CAS treats the change as a SET to the portNum attribute.

This attribute specifies the media type the frame must be in before it is to be forwarded over the outbound supported WAN Bridge Protocol Port. The attribute only applies to outbound Bridge Protocol Port. For supported bridge ports, if the attribute value remains set to the default value of unaltered then there will be no frame conversion. When the value is set to the value ethernetConv then all frames being forwarded out the outbound WAN Port will be converted to ethernet before forwarding takes place. The only outbound WAN medias that currently support conversion are: FR (Frame Relay) and VNS. All other medias will fail the Bridge Port semantic check when attempts are made to alter this attribute. The following is an example of what the user may be able to do. Frames originating from a Token Ring are to be flooded out onto another Token Ring and a Frame Relay Port. The token ring Outbound port performs no translation, yet the FR Port has the outboundFrameMediaType attribute set to ethernetConv which results in the frame being translated into Ethernet format from Token Ring format before Frame Relay does its encapsulation and transmits over the FR port. Enumeration: 'unaltered': 1, 'ethernetConv': 2.

This group houses all the port specific provisionable attributes that belong to the Stp group. The Stp group is applicable to all the bridge ports that participate in the spanning tree protocol. These attributes influence the participation of the bridge port in the spanning tree protocol.

An entry in the vrPpSrBpStpProvTable.

This attribute defines the current administrative state for this component. enabled indicates that the component is available for operation. disabled indicates the component is unavailable for operation. Enumeration: 'down': 2, 'up': 1.

This attribute specifies whether or not spanning tree protocol state for this bridge port is controlled by the spanning tree protocol. In essence it indicates the participation of this bridge port in the spanning tree protocol, by accepting and acting on received bridge protocol data units and by sending out the same. on signifies that this bridge port's spanning tree port state is controlled by the spanning tree protocol. A value of off signifies that the spanning tree port state of this bridge port is unaffected by the spanning tree protocol. This in effect puts the bridge port out of reach of the spanning tree protocol and in the forwarding state. Care should be taken while assigning a value of off to this attribute, as this might cause network loops. Please do not set this attribute to off unless you are absolutely sure about the effect of such an action on your network topology. Enumeration: 'on': 1, 'off': 0.

This attribute specifies the type of spanning tree protocol the port is participating in. A bridge port could participate in either the ieee8021 spanning tree protocol or the dec spanning tree protocol. If the value of the attribute protocolSpec in the SpanningTreeProtocol component, provisioned under the TransparentBridge component is in conflict with the value of this attribute, the value of the protocolSpec attribute will prevail. Prevailing stp type is reflected in the value of the attribute stpTypeOper. Enumeration: 'dec': 2, 'ieee8021': 3.

This attribute specifies the value for port priority, which is contained in the first octet of the port identifier. Valid values are as follows: 1) 0..255 for stp type DEC and 2) 0..65535 for stp type IEEE.

This attribute specifies the contribution of this port, to all the paths to the root bridge that include this port. Please note that the value of the attribute pathCostMethod is applied only when the value of the attribute pathCostMethod is set to on and is ignored if otherwise.

This attribute specifies the method used by the bridging logic, to calculate the path cost to the bridge considered to be the root bridge in the spanning tree topology. This attribute should be set to off before attempting to provision a value for pathCostProv. Enumeration: 'dec': 2, 'off': 1, 'ieee8021': 3.

This group houses all the provisionable, domain specific attributes for a non-encapsulating bridge port.

An entry in the vrPpSrBpDIProvTable.

This attribute specifies the domain number associated with this bridge port. Domain numbers are used for confining frames to a domain. Domain based filtering provides a complete segregation of traffic based on domain number associated with frames. There can exist only sixteen domains when a spanning tree is desired specific to each domain. When there is only a single spanning tree spanning all the domains the maximum number of domains possible are 4294967293. This attribute is of no relevance when associated with backbone bridge port. Its value is ignored in such a situation.

This attribute specifies if the domain information should be preserved or embedded in the frame header. This attribute applies only to backbone ports and does not affect the access bridge ports. By setting this attribute to a value of on, domain information could be preserved in frames being tunnelled across the a backbone, so that this information can be deciphered at the other end of the backbone tunnel. This preserves the integrity of the domains thus preventing domain breaches while tunnelling frames across backbone network. If the value of this attribute is set to off then domain information is not preserved in the header of the frames tunnelling through the backbone. This eliminates the overhead incurred to preserve domain information across the backbone while tunnelling frames across it. Preserve domain is relevant when used in conjunction with the following media: FDDI, ATM MPE, Frame Relay and PPP. It is ignored when used with other types of media. Enumeration: 'on': 1, 'off': 0.

This group contains the three OSI State attributes. The descriptions generically indicate what each state attribute implies about the component. Note that not all the values and state combinations described here are supported by every component which uses this group. For component-specific information and the valid state combinations, refer to NTP 241-7001-150, Passport Operations and Maintenance Guide.

An entry in the vrPpSrBpStateTable.

This attribute indicates the OSI Administrative State of the component. The value locked indicates that the component is administratively prohibited from providing services for its users. A Lock or Lock - force command has been previously issued for this component. When the value is locked, the value of usageState must be idle. The value shuttingDown indicates that the component is administratively permitted to provide service to its existing users only. A Lock command was issued against the component and it is in the process of shutting down. The value unlocked indicates that the component is administratively permitted to provide services for its users. To enter this state, issue an Unlock command to this component. Enumeration: 'locked': 0, 'shuttingDown': 2, 'unlocked': 1.

This attribute indicates the OSI Operational State of the component. The value enabled indicates that the component is available for operation. Note that if adminState is locked, it would still not be providing service. The value disabled indicates that the component is not available for operation. For example, something is wrong with the component itself, or with another component on which this one depends. If the value is disabled, the usageState must be idle. Enumeration: 'disabled': 0, 'enabled': 1.

This attribute indicates the OSI Usage State of the component. The value idle indicates that the component is not currently in use. The value active indicates that the component is in use and has spare capacity to provide for additional users. The value busy indicates that the component is in use and has no spare operating capacity for additional users at this time. Enumeration: 'active': 1, 'idle': 0, 'busy': 2.

This group includes the Operational Status attribute. This attribute defines the current operational state of this component.

An entry in the vrPpSrBpOperStatusTable.

The current state of the interface. The up state indicates the interface is operational and capable of forwarding packets. The down state indicates the interface is not operational, thus unable to forward packets. testing state indicates that no operational packets can be passed. Enumeration: 'down': 2, 'testing': 3, 'up': 1.

This group houses all the operational attributes belonging to the base group. The base group of attributes is applicable to all types of bridge ports and represent the common factor between them. These attributes in part, reflect the state of a bridge port.

An entry in the vrPpSrBpOperTable.

The attribute portName is a string of the form 'BridgePortName-i', where BridgePortName is the abbreviation of the corresponding bridge port and i is the instance identifier of the ProtocolPort, the bridge port is provisioned under. For example a TransparentBridgePort provisioned under ProtocolPort/myport would have a name TBP-myport.

This attribute specifies the accumulated up time of this bridge port since the last reset occurred.

This attribute specifies the accumulated down time of this bridge port since the last reset occurred.

This attribute specifies the mode of bridging this port can support. It in turn implies the format of frames, this bridge port can process and forward. Enumeration: 'unknown': 1, 'tb': 2, 'srt': 4, 'sr': 3.

This attribute specifies the bridge port's configuration. It indicates if the bridge port is operating as an access port or as a backbone port. An access bridge port does not encapsulate a MAC frame and does not preserve domain information in the encapsulation, whereas a backbone bridge port encapsulates the MAC frame and optionally preserves domain information in the encapsulated frame.A backbone bridge port is typically used to transport frames across a high bandwidth backbone network to another bridge unit for further processing/forwarding of the frame. Enumeration: 'access': 1, 'backbone': 2.

This attribute specifies the type of bridge port that was provisioned. It takes into consideration the bridgingMode, bridgePortConfig and the media the bridge port is linked to before branding a bridge port. Enumeration: 'fddiBridgePort': 2, 'ethernetBridgePort': 0, 'snaDlrBridgePort': 21, 'clusterTbBridgePort': 18, 'lanEmulationClientEthernet': 22, 'frameRelayBridgePort': 6, 'srtbBridgePort': 15, 'srEncapSrBridgePort': 11, 'tbsrBridgePort': 16, 'unknown': 19, 'vcpBridgePort': 9, 'clusterSrBridgePort': 17, 'srEncapTbBridgePort': 12, 'fddiEncapsulatingBridgePort': 4, 'sourceGateSrBridgePort': 13, 'sourceGateTbBridgePort': 14, 'x25BridgePort': 10, 'smdsBridgePort': 8, 'tokenRingBridgePort': 1, 'tokenBusBridgePort': 3, 'vnsBridgePort': 5, 'atmMpeBridgePort': 20, 'pppBridgePort': 7.

This attribute specifies the index into the Interface Table where in information about the media interface corresponding to the bridge port is maintained.

This attribute is indicative of the number of frames that were discarded because the time taken to process these frames exceeded the transit delay allowed for this bridge unit. This attribute is not supported by bridging and will always have a value of 0.

This attribute is indicative of the number of frames discarded because the size of the out bound frame exceeded the message transfer unit (mtu) allowed for the bridge port. Note that this counter only refers to the outbound frames for this bridge port. This counter wraps around its maximum value of 4294967295. This counter is influenced by the attribute fragmentIp. This counter is incremented when the a frame larger than the mtu allowed is encountered and cannot be fragmented. If this counter is increasing steadily, it might be useful to set the value of the attribute fragmentIp to a value of on.

This group houses all the port specific operational attributes that belong to the Stp group. The Stp group is applicable to all the bridge ports that participate in the spanning tree protocol. These attributes reflect the state of the bridge port's participation in the spanning tree protocol.

An entry in the vrPpSrBpStpOperTable.

This attribute specifies the spanning tree protocol state of the bridge port. Enumeration: 'listening': 3, 'disabled': 1, 'broken': 6, 'learning': 4, 'forwarding': 5, 'blocking': 2.

This attribute specifies the type of spanning tree protocol the port is participating in. A bridge port could participate in either the ieee8021 spanning tree protocol or the dec spanning tree protocol. Enumeration: 'none': 0, 'dec': 2, 'ieee8021': 3.

This attribute specifies the path cost of the designated port of the lan segment connected to the port.

This attribute specifies the contribution of this port, to all the paths to the root bridge that include this port. This attribute pathCostOper will track the value of the attribute pathCostProv when the value of the attribute pathCostMethod is set of off.

This attribute specifies the identifier of the bridge that this port considers to be the designated bridge.

This attribute specifies the port identifier of the port on the designated bridge, attached to the same lan as this port is attached to.

This attribute is indicative of the number of times this bridge port transitioned from the learning state to the forwarding state. This counter wraps around its maximum value of 4294967295. A rapidly increasing value might be indicative of an unstable spanning tree topology.

This attribute is indicative of the number of incoming frames that were discarded because the bridge port was in the blocking state. This counter wraps around its maximum value of 4294967295.

This attribute specifies the bridge identifier of the bridge recorded as the root bridge, in the configuration BPDUs sent out by the designated bridge on the segment to which the port is attached.

This group houses all the statistical attributes applicable to all types of bridge ports and represents the common factor between them. These attributes in part reflect the state of the bridge port.

An entry in the vrPpSrBpStatsTable.

This attribute is indicative of the number of frames that were discarded because the data that was abstracted, from frames coming in through this bridge port, did not conform to the format expected by the bridge logic.This counter wraps around its maximum value of 4294967295.

This attribute is indicative of the number of frames received on this bridge port that used the tinygram compression scheme.

This attribute is indicative of the number of frames transmitted out this bridge port that used the tinygram compression scheme.

This attribute is indicative of the number of frames discarded at the in filter point. This includes a) frames discarded due to application of the filter defined with PCF for the in filter point and b) the frames discarded due to domain based filtering at the in filter point. This counter wraps around its maximum value of 4294967295.

This attribute is indicative of the number of frames discarded at the out filter point. This includes: a) frames discarded due to application of the filter defined with PCF for the out filter point and b) the frames discarded due to domain based filtering at the out filter point. This counter wraps around its maximum value of 4294967295.

This group contains all port specific, provisionable attributes associated with SourceRouteBridge ports.

An entry in the vrPpSrBpSrProvTable.

This attribute specifies the maximum number of hops allowed in Spanning Tree Explore and All Routes Explore frames. This value is one less than the maximum number of route descriptors allowed in a source route frame

This attribute specifies whether or not explore frames received from SourceRouteBridge ports will be sent to the SRTB-8209 translation or the encapsulated SourceRouteBridge logic. This option is used only when both the TbsrBridgePort and the SrtbBridgePort are provisioned and enabled. A value of Xlate implies that the explore frames will be sent to the Srtb translation logic and a value of Encap implies that the frames will be sent to the Encapsulated source route bridging logic. Enumeration: 'xlate': 1, 'encap': 0.

This attribute specifies the identifier for the physical LAN that this port is attached. All SourceRouteBridge ports are assigned to a physical LAN and a logical internal LAN. Current source route bridge implementations limit the lanId to a value in the range 0 to 4095.

This attribute specifies the identifier for the internal logical LAN this port is attached. All SourceRouteBridge ports are assigned to a physical LAN and a logical internal LAN. Current source route bridge implementations limit the lanId to a value in the range 0 to 4095.

This attribute specifies the value that is used to identify this bridge when more than one bridge is used to span the same two LAN segments.

This attribute specifies the maximum frame size (LLC and above) in octets, allowed by this SourceRouteBridge port. This field is used to determine whether a modification of the largest frame field of the routing control field of the routing information field is warranted.

This attribute determines how this bridge port will react when presented with a Spanning Tree Explore frame. If disabled, the Spanning Tree Explore frame is discarded regardless of the value of stpPortState. If the value of this attribute is forced, the Spanning Tree Explore frame is forwarded regardless of the value of stpPortState. autoSpan uses the stpPortState value to decide whether or not Spanning Tree Explore frames should be forwarded out this bridge port. If the port is in the forwarding state, the frame is received and transmitted otherwise the frame is discarded. Enumeration: 'disabled': 2, 'autoSpan': 1, 'forced': 3.

This attribute specifies the number of route descriptors allowed in an All Routes Explore frame received on a SourceRouteBridgePort or SourceRouteTransparentBridgePort. Current source route bridge implementations limit the areRdLimit to a value in the range 0 to 8.

This attribute specifies the number of route descriptors allowed in a Spanning Tree Explore frame received on a SourceRouteBridgePort or SourceRouteTransparentBridgePort. Current source route bridge implementations limit the steRdLimit to a value in the range 0 to 8.

This group contains all port specific statistical attributes associated with SourceRouteBridge ports.

An entry in the vrPpSrBpSrStatsTable.

This attribute specifies the number of specifically routed frames that were received by this bridge port. A specifically routed frame has a route descriptor, constructed by the originating host which details an explicit route to the destination host. This counter will wrap to zero when it exceeds its maximum.

This attribute specifies the number of specifically routed frames that were transmitted from this bridge port. This counter will wrap to zero when it exceeds its maximum.

This attribute specifies the number of All Path Explore frames received on this bridge port. The All Path Explore frames are forwarded to all SourceRouteBridge ports assigned to this bridge regardless of the port's portStpStates. This counter will wrap to zero when it exceeds its maximum.

This attribute specifies the number of All Path Explore frames transmitted on this bridge port. The All Path Explore frames are forwarded to all SourceRouteBridge ports assigned to this bridge regardless of the port's portStpState state. This counter will wrap to zero when it exceeds its maximum.

This attribute specifies the number of Spanning Tree Explore frames received on this bridge port. The Spanning Tree Explore frames are only forwarded through bridge ports whose portStpState has a value of forwarding. This counter will wrap to zero when it exceeds its maximum.

This attribute specifies the number of Spanning Tree Frames transmitted on this bridge port. This counter will wrap to zero when it exceeds its maximum.

This attribute specifies the number of All Routes Explore and Spanning Tree Explore frames that were discarded due to an invalid next segment value in the routing information field. This counter will wrap to zero when it exceeds its maximum.

This attribute specifies the number of frames discarded due to the presence of a duplicate segment identifier in the route descriptor field which may indicate a loop in the network topology. This counter will wrap to zero when it exceeds its maximum.

This attribute specifies the number of All Routes Explore and Spanning Tree Explore frames discarded by this bridge port due to a frame exceeding the maximum size allowed for a route descriptor length. This counter will wrap to zero when it exceeds its maximum.

This attribute specifies the number frames received which contain duplicate LAN IDs or Tree errors. This attribute is helpful in debugging problems in networks which contain older IBM-SR bridges. This counter will wrap to zero when it exceeds its maximum.

This attributes counts the number of All Routes Explore or Spanning Tree Explore frames that were discarded because the last LAN ID in the routing information field did not equal the LAN ID. This counter will wrap to zero when it exceeds its maximum.

This attribute is indicative of the number of explorer frames discarded due to fact that the outbound SourceRouteBridge port was disabled or deleted. This counter will wrap to zero when it exceeds its maximum.

This attribute specifies the number of frames discarded due to receiving a frame with a target LAN ID which did not match the internal LAN ID of the receiving bridge port. This counter will wrap to zero when it exceeds its maximum.

This entry controls the addition and deletion of vrPpSrtBp components.

A single entry in the table represents a single vrPpSrtBp component.

This variable is used as the basis for SNMP naming of vrPpSrtBp components. These components can be added and deleted.

This variable provides the component's string name for use with the ASCII Console Interface

This variable represents the storage type value for the vrPpSrtBp tables.

This variable represents the index for the vrPpSrtBp tables.

This entry controls the addition and deletion of vrPpSrtBpNs components.

A single entry in the table represents a single vrPpSrtBpNs component.

This variable is used as the basis for SNMP naming of vrPpSrtBpNs components. These components can be added and deleted.

This variable provides the component's string name for use with the ASCII Console Interface

This variable represents the storage type value for the vrPpSrtBpNs tables.

This variable represents the index for the vrPpSrtBpNs tables.

This group houses all the port specific provisionable attributes associated with Ns. These attributes influence the application of filters to incoming and outgoing frames.

An entry in the vrPpSrtBpNsProvTable.

This attribute specifies the name of the filter to be applied at the incoming filter point.

This attribute specifies the name of the filter to be applied at the out going filter point.

This group houses all the provisionable attributes that belong to the this group. This group of attributes is applicable to all types of bridge ports and represent the common factor between them. These attributes influence the working of a bridge port.

An entry in the vrPpSrtBpProvTable.

This attribute specifies the type of translation to be performed on frames carrying IPX packets. Ethernet frames carrying IPX payload could be translated to IEEE 802.3 frames (with the same IPX payload) or vice- versa. The main reason to do so is to allow the bridge unit to consistently forward one type of frames carrying IPX packets. Translations can be turned off altogether in which case the IPX frames will pass through the bridge unit unchanged. Enumeration: 'snap': 3, 'ethernet': 2, 'sap': 4, 'off': 0, 'ieee8023': 1.

This attribute specifies if or not outbound frames carrying IP datagrams should be fragmented to conform to message transfer unit (mtu) sizes dictated by the media. Enumeration: 'on': 1, 'off': 0.

This attribute specifies if the frames should be ordered or not before they are transmitted through a bridge port. If this attribute has a value of ordered the received frames are ordered as in the original message, before they are transmitted out through a bridge port. If it has a value of notOrdered, received then frames pass through the bridge unit in the order they are received. This feature can be used over multiple telecommunication links to increase data flow. Please note that this attribute only affects link protocols and is ineffective with lan media. Enumeration: 'notOrdered': 1, 'ordered': 0.

This attribute is indicative of the state of the MAC address format conversion process for ARP/RARP frames. The MAC addresses may be translated if need be from a canonical format to a non-canonical format, based on the needs of the associated media. If this attribute is set to a value of on then all Mac addresses will converted if need be to suit the format of mac address, the outgoing media will support. If this attribute is set to a value of off no such conversion takes place. Enumeration: 'on': 1, 'off': 0.

This attribute is indicative of the unique number assigned to the bridge port. It is used for SNMP management of this bridge port and in spanning tree as an identifier this bridge port. Notes regarding portNum: Escape routines exist for initializing, copying, and deleting port numbers. This is necessary because SNMP requires a unique port instance identifier. The initPortNum escape routine sets the port number to a value in the range 1-255 for this purpose. The setCopiedPortNum escape routine exists to maintain the uniqueness of the port number in cases when one port is copied to another. When a bridge port is deleted, the releasePortNum escape routine places the port number being released into a pending deletion state. This is because the port number cannot be re-allocated until the port is truely deleted in the current view. This is necessary since there is no guarantee of order when processing changes to multiple protocol ports so without the pending deletion state, the same port number could be temporarily assigned to two ports for a short period of time. The portNum is set as component critical since bridging also uses the port number as a key for indexing into its data structures. If a port is deleted then re-added under the same protocol port, CAS treats the change as a SET to the portNum attribute.

This attribute specifies the media type the frame must be in before it is to be forwarded over the outbound supported WAN Bridge Protocol Port. The attribute only applies to outbound Bridge Protocol Port. For supported bridge ports, if the attribute value remains set to the default value of unaltered then there will be no frame conversion. When the value is set to the value ethernetConv then all frames being forwarded out the outbound WAN Port will be converted to ethernet before forwarding takes place. The only outbound WAN medias that currently support conversion are: FR (Frame Relay) and VNS. All other medias will fail the Bridge Port semantic check when attempts are made to alter this attribute. The following is an example of what the user may be able to do. Frames originating from a Token Ring are to be flooded out onto another Token Ring and a Frame Relay Port. The token ring Outbound port performs no translation, yet the FR Port has the outboundFrameMediaType attribute set to ethernetConv which results in the frame being translated into Ethernet format from Token Ring format before Frame Relay does its encapsulation and transmits over the FR port. Enumeration: 'unaltered': 1, 'ethernetConv': 2.

This group houses all the port specific provisionable attributes that belong to the Tb group. The Tb group is only applicable bridge port types that operate in the TB mode. These attributes in part influence the working of a bridge port operating in the TB mode.

An entry in the vrPpSrtBpTbProvTable.

This attribute specifies whether the port secure feature is enabled. The secure feature, if enabled causes the following things to happen: a) disallows dynamic learning, b) disallows frames to be forwarded that do not satisfy the following condition: the mac address of the source should be found in the forwarding table and the destination mac address of the frame should also be found in the forwarding table. In addition to this, the port the frame was received on should figure as the in port, given the destination mac address found in the frame. c) disallows frames to be forwarded if the allowed to go port map for the destination mac address is empty. This feature in effect allows the user to choose the hosts that can generate traffic and the hosts that can receive traffic through this bridge unit. Enumeration: 'disabled': 0, 'enabled': 1.

This group houses all the port specific provisionable attributes that belong to the Stp group. The Stp group is applicable to all the bridge ports that participate in the spanning tree protocol. These attributes influence the participation of the bridge port in the spanning tree protocol.

An entry in the vrPpSrtBpStpProvTable.

This attribute defines the current administrative state for this component. enabled indicates that the component is available for operation. disabled indicates the component is unavailable for operation. Enumeration: 'down': 2, 'up': 1.

This attribute specifies whether or not spanning tree protocol state for this bridge port is controlled by the spanning tree protocol. In essence it indicates the participation of this bridge port in the spanning tree protocol, by accepting and acting on received bridge protocol data units and by sending out the same. on signifies that this bridge port's spanning tree port state is controlled by the spanning tree protocol. A value of off signifies that the spanning tree port state of this bridge port is unaffected by the spanning tree protocol. This in effect puts the bridge port out of reach of the spanning tree protocol and in the forwarding state. Care should be taken while assigning a value of off to this attribute, as this might cause network loops. Please do not set this attribute to off unless you are absolutely sure about the effect of such an action on your network topology. Enumeration: 'on': 1, 'off': 0.

This attribute specifies the type of spanning tree protocol the port is participating in. A bridge port could participate in either the ieee8021 spanning tree protocol or the dec spanning tree protocol. If the value of the attribute protocolSpec in the SpanningTreeProtocol component, provisioned under the TransparentBridge component is in conflict with the value of this attribute, the value of the protocolSpec attribute will prevail. Prevailing stp type is reflected in the value of the attribute stpTypeOper. Enumeration: 'dec': 2, 'ieee8021': 3.

This attribute specifies the value for port priority, which is contained in the first octet of the port identifier. Valid values are as follows: 1) 0..255 for stp type DEC and 2) 0..65535 for stp type IEEE.

This attribute specifies the contribution of this port, to all the paths to the root bridge that include this port. Please note that the value of the attribute pathCostMethod is applied only when the value of the attribute pathCostMethod is set to on and is ignored if otherwise.

This attribute specifies the method used by the bridging logic, to calculate the path cost to the bridge considered to be the root bridge in the spanning tree topology. This attribute should be set to off before attempting to provision a value for pathCostProv. Enumeration: 'dec': 2, 'off': 1, 'ieee8021': 3.

This group houses all the provisionable, domain specific attributes for a non-encapsulating bridge port.

An entry in the vrPpSrtBpDIProvTable.

This attribute specifies the domain number associated with this bridge port. Domain numbers are used for confining frames to a domain. Domain based filtering provides a complete segregation of traffic based on domain number associated with frames. There can exist only sixteen domains when a spanning tree is desired specific to each domain. When there is only a single spanning tree spanning all the domains the maximum number of domains possible are 4294967293. This attribute is of no relevance when associated with backbone bridge port. Its value is ignored in such a situation.

This attribute specifies if the domain information should be preserved or embedded in the frame header. This attribute applies only to backbone ports and does not affect the access bridge ports. By setting this attribute to a value of on, domain information could be preserved in frames being tunnelled across the a backbone, so that this information can be deciphered at the other end of the backbone tunnel. This preserves the integrity of the domains thus preventing domain breaches while tunnelling frames across backbone network. If the value of this attribute is set to off then domain information is not preserved in the header of the frames tunnelling through the backbone. This eliminates the overhead incurred to preserve domain information across the backbone while tunnelling frames across it. Preserve domain is relevant when used in conjunction with the following media: FDDI, ATM MPE, Frame Relay and PPP. It is ignored when used with other types of media. Enumeration: 'on': 1, 'off': 0.

This group contains the three OSI State attributes. The descriptions generically indicate what each state attribute implies about the component. Note that not all the values and state combinations described here are supported by every component which uses this group. For component-specific information and the valid state combinations, refer to NTP 241-7001-150, Passport Operations and Maintenance Guide.

An entry in the vrPpSrtBpStateTable.

This attribute indicates the OSI Administrative State of the component. The value locked indicates that the component is administratively prohibited from providing services for its users. A Lock or Lock - force command has been previously issued for this component. When the value is locked, the value of usageState must be idle. The value shuttingDown indicates that the component is administratively permitted to provide service to its existing users only. A Lock command was issued against the component and it is in the process of shutting down. The value unlocked indicates that the component is administratively permitted to provide services for its users. To enter this state, issue an Unlock command to this component. Enumeration: 'locked': 0, 'shuttingDown': 2, 'unlocked': 1.

This attribute indicates the OSI Operational State of the component. The value enabled indicates that the component is available for operation. Note that if adminState is locked, it would still not be providing service. The value disabled indicates that the component is not available for operation. For example, something is wrong with the component itself, or with another component on which this one depends. If the value is disabled, the usageState must be idle. Enumeration: 'disabled': 0, 'enabled': 1.

This attribute indicates the OSI Usage State of the component. The value idle indicates that the component is not currently in use. The value active indicates that the component is in use and has spare capacity to provide for additional users. The value busy indicates that the component is in use and has no spare operating capacity for additional users at this time. Enumeration: 'active': 1, 'idle': 0, 'busy': 2.

This group includes the Operational Status attribute. This attribute defines the current operational state of this component.

An entry in the vrPpSrtBpOperStatusTable.

The current state of the interface. The up state indicates the interface is operational and capable of forwarding packets. The down state indicates the interface is not operational, thus unable to forward packets. testing state indicates that no operational packets can be passed. Enumeration: 'down': 2, 'testing': 3, 'up': 1.

This group houses all the operational attributes belonging to the base group. The base group of attributes is applicable to all types of bridge ports and represent the common factor between them. These attributes in part, reflect the state of a bridge port.

An entry in the vrPpSrtBpOperTable.

The attribute portName is a string of the form 'BridgePortName-i', where BridgePortName is the abbreviation of the corresponding bridge port and i is the instance identifier of the ProtocolPort, the bridge port is provisioned under. For example a TransparentBridgePort provisioned under ProtocolPort/myport would have a name TBP-myport.

This attribute specifies the accumulated up time of this bridge port since the last reset occurred.

This attribute specifies the accumulated down time of this bridge port since the last reset occurred.

This attribute specifies the mode of bridging this port can support. It in turn implies the format of frames, this bridge port can process and forward. Enumeration: 'unknown': 1, 'tb': 2, 'srt': 4, 'sr': 3.

This attribute specifies the bridge port's configuration. It indicates if the bridge port is operating as an access port or as a backbone port. An access bridge port does not encapsulate a MAC frame and does not preserve domain information in the encapsulation, whereas a backbone bridge port encapsulates the MAC frame and optionally preserves domain information in the encapsulated frame.A backbone bridge port is typically used to transport frames across a high bandwidth backbone network to another bridge unit for further processing/forwarding of the frame. Enumeration: 'access': 1, 'backbone': 2.

This attribute specifies the type of bridge port that was provisioned. It takes into consideration the bridgingMode, bridgePortConfig and the media the bridge port is linked to before branding a bridge port. Enumeration: 'fddiBridgePort': 2, 'ethernetBridgePort': 0, 'snaDlrBridgePort': 21, 'clusterTbBridgePort': 18, 'lanEmulationClientEthernet': 22, 'frameRelayBridgePort': 6, 'srtbBridgePort': 15, 'srEncapSrBridgePort': 11, 'tbsrBridgePort': 16, 'unknown': 19, 'vcpBridgePort': 9, 'clusterSrBridgePort': 17, 'srEncapTbBridgePort': 12, 'fddiEncapsulatingBridgePort': 4, 'sourceGateSrBridgePort': 13, 'sourceGateTbBridgePort': 14, 'x25BridgePort': 10, 'smdsBridgePort': 8, 'tokenRingBridgePort': 1, 'tokenBusBridgePort': 3, 'vnsBridgePort': 5, 'atmMpeBridgePort': 20, 'pppBridgePort': 7.

This attribute specifies the index into the Interface Table where in information about the media interface corresponding to the bridge port is maintained.

This attribute is indicative of the number of frames that were discarded because the time taken to process these frames exceeded the transit delay allowed for this bridge unit. This attribute is not supported by bridging and will always have a value of 0.

This attribute is indicative of the number of frames discarded because the size of the out bound frame exceeded the message transfer unit (mtu) allowed for the bridge port. Note that this counter only refers to the outbound frames for this bridge port. This counter wraps around its maximum value of 4294967295. This counter is influenced by the attribute fragmentIp. This counter is incremented when the a frame larger than the mtu allowed is encountered and cannot be fragmented. If this counter is increasing steadily, it might be useful to set the value of the attribute fragmentIp to a value of on.

This group houses all the port specific operational attributes that belong to the Tb group. This group also houses all the port specific statistical attributes that belong to the Tb group. The Tb group is only applicable bridge port types that operate in the TB mode. These attributes reflect the state of a bridge port operating in the TB mode

An entry in the vrPpSrtBpTbOperTable.

This attribute specifies the maximum size of the information field in a TB frame. This excludes the header field.

This attribute is indicative of the number of incoming frames that were discarded because: a) the value of the secureOption attribute was set to on and b) it is not allowed to receive frames originating from the mac address found in the source address field of the frame (source mac address look up in the forwarding table failed.) on this bridge port. c) for the destination mac address found in the frame, the port the frame was received on does not appear as in port in the corresponding static table entry. Permission to receive frames from a mac address is granted via the static table entries. This attribute, badVerifyDiscards, is directly influenced by: 1. secureOption and 2. the static table entries. This counter wraps around its maximum value of 4294967295.

This attribute is indicative of the number frames discarded because the MAC address found in the destination field did not match the local MAC address of the bridge port. This counter is only applicable for the protocols that are being routed currently.This counter wraps around its maximum value of 4294967295.

This attribute is indicative of the number of frames that were discarded because of the following two reasons: a) there was no entry for the 'allowed to go' field in the static table entry, where the input port is this bridge port. b) for spanning tree bpdus that are locally processed. This counter wraps around its maximum value of 4294967295. It might prove useful to check the static table entry corresponding to the bridge port in question, if this counter consistently displays a high value. Ideally this counter should be as low as possible.

This attribute is indicative of the number of incoming frames that a) were discarded because of the fact that the bridge port, the frame is to go out of matches the bridge port it came in from or b) if the stp port state of the out port is not forwarding. This counter wraps around its maximum value of 4294967295.

This attribute is indicative of the number of frames that were discarded while this bridge port was in a state other than the forwarding state. While in learning state the frame is discarded after the information from its header is learnt. This counter wraps around its maximum value of 4294967295.

This attribute is indicative of the number of frames that were received by this bridge port and were discarded by the forwarding process. This includes frames that could have been discarded due to filtering. A repidly increasing value for this attribute could indicate a shrtage of resource in terms of memory needed to process the incoming frames. More memory can be provisioned through the VirtualRouter's memory manager.

This attribute is indicative of the number of frames that have been received by this port from its segment. Note that a frame received on this bridge port is counted if and only if it can be processed by the bridge logic contained in this bridge unit, a protocol that can be processed by the bridge logic. This counter wraps around its maximum value of 4294967295.

This attribute is indicative of the number of frames that have been transmitted out this bridge port. Note that frame transmitted out this bridge port is counted if and only if it is for a protocol being processed by the bridge unit. This also includes management frames.This counter wraps around its maximum value of 4294967295.

This group houses all the port specific operational attributes that belong to the Stp group. The Stp group is applicable to all the bridge ports that participate in the spanning tree protocol. These attributes reflect the state of the bridge port's participation in the spanning tree protocol.

An entry in the vrPpSrtBpStpOperTable.

This attribute specifies the spanning tree protocol state of the bridge port. Enumeration: 'listening': 3, 'disabled': 1, 'broken': 6, 'learning': 4, 'forwarding': 5, 'blocking': 2.

This attribute specifies the type of spanning tree protocol the port is participating in. A bridge port could participate in either the ieee8021 spanning tree protocol or the dec spanning tree protocol. Enumeration: 'none': 0, 'dec': 2, 'ieee8021': 3.

This attribute specifies the path cost of the designated port of the lan segment connected to the port.

This attribute specifies the contribution of this port, to all the paths to the root bridge that include this port. This attribute pathCostOper will track the value of the attribute pathCostProv when the value of the attribute pathCostMethod is set of off.

This attribute specifies the identifier of the bridge that this port considers to be the designated bridge.

This attribute specifies the port identifier of the port on the designated bridge, attached to the same lan as this port is attached to.

This attribute is indicative of the number of times this bridge port transitioned from the learning state to the forwarding state. This counter wraps around its maximum value of 4294967295. A rapidly increasing value might be indicative of an unstable spanning tree topology.

This attribute is indicative of the number of incoming frames that were discarded because the bridge port was in the blocking state. This counter wraps around its maximum value of 4294967295.

This attribute specifies the bridge identifier of the bridge recorded as the root bridge, in the configuration BPDUs sent out by the designated bridge on the segment to which the port is attached.

This group houses all the statistical attributes applicable to all types of bridge ports and represents the common factor between them. These attributes in part reflect the state of the bridge port.

An entry in the vrPpSrtBpStatsTable.

This attribute is indicative of the number of frames that were discarded because the data that was abstracted, from frames coming in through this bridge port, did not conform to the format expected by the bridge logic.This counter wraps around its maximum value of 4294967295.

This attribute is indicative of the number of frames received on this bridge port that used the tinygram compression scheme.

This attribute is indicative of the number of frames transmitted out this bridge port that used the tinygram compression scheme.

This attribute is indicative of the number of frames discarded at the in filter point. This includes a) frames discarded due to application of the filter defined with PCF for the in filter point and b) the frames discarded due to domain based filtering at the in filter point. This counter wraps around its maximum value of 4294967295.

This attribute is indicative of the number of frames discarded at the out filter point. This includes: a) frames discarded due to application of the filter defined with PCF for the out filter point and b) the frames discarded due to domain based filtering at the out filter point. This counter wraps around its maximum value of 4294967295.

This group contains all port specific, provisionable attributes associated with SourceRouteBridge ports.

An entry in the vrPpSrtBpSrProvTable.

This attribute specifies the maximum number of hops allowed in Spanning Tree Explore and All Routes Explore frames. This value is one less than the maximum number of route descriptors allowed in a source route frame

This attribute specifies whether or not explore frames received from SourceRouteBridge ports will be sent to the SRTB-8209 translation or the encapsulated SourceRouteBridge logic. This option is used only when both the TbsrBridgePort and the SrtbBridgePort are provisioned and enabled. A value of Xlate implies that the explore frames will be sent to the Srtb translation logic and a value of Encap implies that the frames will be sent to the Encapsulated source route bridging logic. Enumeration: 'xlate': 1, 'encap': 0.

This attribute specifies the identifier for the physical LAN that this port is attached. All SourceRouteBridge ports are assigned to a physical LAN and a logical internal LAN. Current source route bridge implementations limit the lanId to a value in the range 0 to 4095.

This attribute specifies the identifier for the internal logical LAN this port is attached. All SourceRouteBridge ports are assigned to a physical LAN and a logical internal LAN. Current source route bridge implementations limit the lanId to a value in the range 0 to 4095.

This attribute specifies the value that is used to identify this bridge when more than one bridge is used to span the same two LAN segments.

This attribute specifies the maximum frame size (LLC and above) in octets, allowed by this SourceRouteBridge port. This field is used to determine whether a modification of the largest frame field of the routing control field of the routing information field is warranted.

This attribute determines how this bridge port will react when presented with a Spanning Tree Explore frame. If disabled, the Spanning Tree Explore frame is discarded regardless of the value of stpPortState. If the value of this attribute is forced, the Spanning Tree Explore frame is forwarded regardless of the value of stpPortState. autoSpan uses the stpPortState value to decide whether or not Spanning Tree Explore frames should be forwarded out this bridge port. If the port is in the forwarding state, the frame is received and transmitted otherwise the frame is discarded. Enumeration: 'disabled': 2, 'autoSpan': 1, 'forced': 3.

This attribute specifies the number of route descriptors allowed in an All Routes Explore frame received on a SourceRouteBridgePort or SourceRouteTransparentBridgePort. Current source route bridge implementations limit the areRdLimit to a value in the range 0 to 8.

This attribute specifies the number of route descriptors allowed in a Spanning Tree Explore frame received on a SourceRouteBridgePort or SourceRouteTransparentBridgePort. Current source route bridge implementations limit the steRdLimit to a value in the range 0 to 8.

This group contains all port specific statistical attributes associated with SourceRouteBridge ports.

An entry in the vrPpSrtBpSrStatsTable.

This attribute specifies the number of specifically routed frames that were received by this bridge port. A specifically routed frame has a route descriptor, constructed by the originating host which details an explicit route to the destination host. This counter will wrap to zero when it exceeds its maximum.

This attribute specifies the number of specifically routed frames that were transmitted from this bridge port. This counter will wrap to zero when it exceeds its maximum.

This attribute specifies the number of All Path Explore frames received on this bridge port. The All Path Explore frames are forwarded to all SourceRouteBridge ports assigned to this bridge regardless of the port's portStpStates. This counter will wrap to zero when it exceeds its maximum.

This attribute specifies the number of All Path Explore frames transmitted on this bridge port. The All Path Explore frames are forwarded to all SourceRouteBridge ports assigned to this bridge regardless of the port's portStpState state. This counter will wrap to zero when it exceeds its maximum.

This attribute specifies the number of Spanning Tree Explore frames received on this bridge port. The Spanning Tree Explore frames are only forwarded through bridge ports whose portStpState has a value of forwarding. This counter will wrap to zero when it exceeds its maximum.

This attribute specifies the number of Spanning Tree Frames transmitted on this bridge port. This counter will wrap to zero when it exceeds its maximum.

This attribute specifies the number of All Routes Explore and Spanning Tree Explore frames that were discarded due to an invalid next segment value in the routing information field. This counter will wrap to zero when it exceeds its maximum.

This attribute specifies the number of frames discarded due to the presence of a duplicate segment identifier in the route descriptor field which may indicate a loop in the network topology. This counter will wrap to zero when it exceeds its maximum.

This attribute specifies the number of All Routes Explore and Spanning Tree Explore frames discarded by this bridge port due to a frame exceeding the maximum size allowed for a route descriptor length. This counter will wrap to zero when it exceeds its maximum.

This attribute specifies the number frames received which contain duplicate LAN IDs or Tree errors. This attribute is helpful in debugging problems in networks which contain older IBM-SR bridges. This counter will wrap to zero when it exceeds its maximum.

This attributes counts the number of All Routes Explore or Spanning Tree Explore frames that were discarded because the last LAN ID in the routing information field did not equal the LAN ID. This counter will wrap to zero when it exceeds its maximum.

This attribute is indicative of the number of explorer frames discarded due to fact that the outbound SourceRouteBridge port was disabled or deleted. This counter will wrap to zero when it exceeds its maximum.

This attribute specifies the number of frames discarded due to receiving a frame with a target LAN ID which did not match the internal LAN ID of the receiving bridge port. This counter will wrap to zero when it exceeds its maximum.

This entry controls the addition and deletion of vrPpSrse components.

A single entry in the table represents a single vrPpSrse component.

This variable is used as the basis for SNMP naming of vrPpSrse components. These components can be added and deleted.

This variable provides the component's string name for use with the ASCII Console Interface

This variable represents the storage type value for the vrPpSrse tables.

This variable represents the index for the vrPpSrse tables.

This group houses all the provisionable attributes that belong to the this group. This group of attributes is applicable to all types of bridge ports and represent the common factor between them. These attributes influence the working of a bridge port.

An entry in the vrPpSrseProvTable.

This attribute specifies the type of translation to be performed on frames carrying IPX packets. Ethernet frames carrying IPX payload could be translated to IEEE 802.3 frames (with the same IPX payload) or vice- versa. The main reason to do so is to allow the bridge unit to consistently forward one type of frames carrying IPX packets. Translations can be turned off altogether in which case the IPX frames will pass through the bridge unit unchanged. Enumeration: 'snap': 3, 'ethernet': 2, 'sap': 4, 'off': 0, 'ieee8023': 1.

This attribute specifies if or not outbound frames carrying IP datagrams should be fragmented to conform to message transfer unit (mtu) sizes dictated by the media. Enumeration: 'on': 1, 'off': 0.

This attribute specifies if the frames should be ordered or not before they are transmitted through a bridge port. If this attribute has a value of ordered the received frames are ordered as in the original message, before they are transmitted out through a bridge port. If it has a value of notOrdered, received then frames pass through the bridge unit in the order they are received. This feature can be used over multiple telecommunication links to increase data flow. Please note that this attribute only affects link protocols and is ineffective with lan media. Enumeration: 'notOrdered': 1, 'ordered': 0.

This attribute is indicative of the state of the MAC address format conversion process for ARP/RARP frames. The MAC addresses may be translated if need be from a canonical format to a non-canonical format, based on the needs of the associated media. If this attribute is set to a value of on then all Mac addresses will converted if need be to suit the format of mac address, the outgoing media will support. If this attribute is set to a value of off no such conversion takes place. Enumeration: 'on': 1, 'off': 0.

This attribute is indicative of the unique number assigned to the bridge port. It is used for SNMP management of this bridge port and in spanning tree as an identifier this bridge port. Notes regarding portNum: Escape routines exist for initializing, copying, and deleting port numbers. This is necessary because SNMP requires a unique port instance identifier. The initPortNum escape routine sets the port number to a value in the range 1-255 for this purpose. The setCopiedPortNum escape routine exists to maintain the uniqueness of the port number in cases when one port is copied to another. When a bridge port is deleted, the releasePortNum escape routine places the port number being released into a pending deletion state. This is because the port number cannot be re-allocated until the port is truely deleted in the current view. This is necessary since there is no guarantee of order when processing changes to multiple protocol ports so without the pending deletion state, the same port number could be temporarily assigned to two ports for a short period of time. The portNum is set as component critical since bridging also uses the port number as a key for indexing into its data structures. If a port is deleted then re-added under the same protocol port, CAS treats the change as a SET to the portNum attribute.

This attribute specifies the media type the frame must be in before it is to be forwarded over the outbound supported WAN Bridge Protocol Port. The attribute only applies to outbound Bridge Protocol Port. For supported bridge ports, if the attribute value remains set to the default value of unaltered then there will be no frame conversion. When the value is set to the value ethernetConv then all frames being forwarded out the outbound WAN Port will be converted to ethernet before forwarding takes place. The only outbound WAN medias that currently support conversion are: FR (Frame Relay) and VNS. All other medias will fail the Bridge Port semantic check when attempts are made to alter this attribute. The following is an example of what the user may be able to do. Frames originating from a Token Ring are to be flooded out onto another Token Ring and a Frame Relay Port. The token ring Outbound port performs no translation, yet the FR Port has the outboundFrameMediaType attribute set to ethernetConv which results in the frame being translated into Ethernet format from Token Ring format before Frame Relay does its encapsulation and transmits over the FR port. Enumeration: 'unaltered': 1, 'ethernetConv': 2.

This group houses all the port specific provisionable attributes that belong to the Stp group. The Stp group is applicable to all the bridge ports that participate in the spanning tree protocol. These attributes influence the participation of the bridge port in the spanning tree protocol.

An entry in the vrPpSrseStpProvTable.

This attribute defines the current administrative state for this component. enabled indicates that the component is available for operation. disabled indicates the component is unavailable for operation. Enumeration: 'down': 2, 'up': 1.

This attribute specifies whether or not spanning tree protocol state for this bridge port is controlled by the spanning tree protocol. In essence it indicates the participation of this bridge port in the spanning tree protocol, by accepting and acting on received bridge protocol data units and by sending out the same. on signifies that this bridge port's spanning tree port state is controlled by the spanning tree protocol. A value of off signifies that the spanning tree port state of this bridge port is unaffected by the spanning tree protocol. This in effect puts the bridge port out of reach of the spanning tree protocol and in the forwarding state. Care should be taken while assigning a value of off to this attribute, as this might cause network loops. Please do not set this attribute to off unless you are absolutely sure about the effect of such an action on your network topology. Enumeration: 'on': 1, 'off': 0.

This attribute specifies the type of spanning tree protocol the port is participating in. A bridge port could participate in either the ieee8021 spanning tree protocol or the dec spanning tree protocol. If the value of the attribute protocolSpec in the SpanningTreeProtocol component, provisioned under the TransparentBridge component is in conflict with the value of this attribute, the value of the protocolSpec attribute will prevail. Prevailing stp type is reflected in the value of the attribute stpTypeOper. Enumeration: 'dec': 2, 'ieee8021': 3.

This attribute specifies the value for port priority, which is contained in the first octet of the port identifier. Valid values are as follows: 1) 0..255 for stp type DEC and 2) 0..65535 for stp type IEEE.

This attribute specifies the contribution of this port, to all the paths to the root bridge that include this port. Please note that the value of the attribute pathCostMethod is applied only when the value of the attribute pathCostMethod is set to on and is ignored if otherwise.

This attribute specifies the method used by the bridging logic, to calculate the path cost to the bridge considered to be the root bridge in the spanning tree topology. This attribute should be set to off before attempting to provision a value for pathCostProv. Enumeration: 'dec': 2, 'off': 1, 'ieee8021': 3.

This group houses all the provisionable, domain specific attributes for a non-encapsulating bridge port.

An entry in the vrPpSrseDIProvTable.

This attribute specifies the domain number associated with this bridge port. Domain numbers are used for confining frames to a domain. Domain based filtering provides a complete segregation of traffic based on domain number associated with frames. There can exist only sixteen domains when a spanning tree is desired specific to each domain. When there is only a single spanning tree spanning all the domains the maximum number of domains possible are 4294967293. This attribute is of no relevance when associated with backbone bridge port. Its value is ignored in such a situation.

This attribute specifies if the domain information should be preserved or embedded in the frame header. This attribute applies only to backbone ports and does not affect the access bridge ports. By setting this attribute to a value of on, domain information could be preserved in frames being tunnelled across the a backbone, so that this information can be deciphered at the other end of the backbone tunnel. This preserves the integrity of the domains thus preventing domain breaches while tunnelling frames across backbone network. If the value of this attribute is set to off then domain information is not preserved in the header of the frames tunnelling through the backbone. This eliminates the overhead incurred to preserve domain information across the backbone while tunnelling frames across it. Preserve domain is relevant when used in conjunction with the following media: FDDI, ATM MPE, Frame Relay and PPP. It is ignored when used with other types of media. Enumeration: 'on': 1, 'off': 0.

This group contains the three OSI State attributes. The descriptions generically indicate what each state attribute implies about the component. Note that not all the values and state combinations described here are supported by every component which uses this group. For component-specific information and the valid state combinations, refer to NTP 241-7001-150, Passport Operations and Maintenance Guide.

An entry in the vrPpSrseStateTable.

This attribute indicates the OSI Administrative State of the component. The value locked indicates that the component is administratively prohibited from providing services for its users. A Lock or Lock - force command has been previously issued for this component. When the value is locked, the value of usageState must be idle. The value shuttingDown indicates that the component is administratively permitted to provide service to its existing users only. A Lock command was issued against the component and it is in the process of shutting down. The value unlocked indicates that the component is administratively permitted to provide services for its users. To enter this state, issue an Unlock command to this component. Enumeration: 'locked': 0, 'shuttingDown': 2, 'unlocked': 1.

This attribute indicates the OSI Operational State of the component. The value enabled indicates that the component is available for operation. Note that if adminState is locked, it would still not be providing service. The value disabled indicates that the component is not available for operation. For example, something is wrong with the component itself, or with another component on which this one depends. If the value is disabled, the usageState must be idle. Enumeration: 'disabled': 0, 'enabled': 1.

This attribute indicates the OSI Usage State of the component. The value idle indicates that the component is not currently in use. The value active indicates that the component is in use and has spare capacity to provide for additional users. The value busy indicates that the component is in use and has no spare operating capacity for additional users at this time. Enumeration: 'active': 1, 'idle': 0, 'busy': 2.

This group includes the Operational Status attribute. This attribute defines the current operational state of this component.

An entry in the vrPpSrseOperStatusTable.

The current state of the interface. The up state indicates the interface is operational and capable of forwarding packets. The down state indicates the interface is not operational, thus unable to forward packets. testing state indicates that no operational packets can be passed. Enumeration: 'down': 2, 'testing': 3, 'up': 1.

This group houses all the operational attributes belonging to the base group. The base group of attributes is applicable to all types of bridge ports and represent the common factor between them. These attributes in part, reflect the state of a bridge port.

An entry in the vrPpSrseOperTable.

The attribute portName is a string of the form 'BridgePortName-i', where BridgePortName is the abbreviation of the corresponding bridge port and i is the instance identifier of the ProtocolPort, the bridge port is provisioned under. For example a TransparentBridgePort provisioned under ProtocolPort/myport would have a name TBP-myport.

This attribute specifies the accumulated up time of this bridge port since the last reset occurred.

This attribute specifies the accumulated down time of this bridge port since the last reset occurred.

This attribute specifies the mode of bridging this port can support. It in turn implies the format of frames, this bridge port can process and forward. Enumeration: 'unknown': 1, 'tb': 2, 'srt': 4, 'sr': 3.

This attribute specifies the bridge port's configuration. It indicates if the bridge port is operating as an access port or as a backbone port. An access bridge port does not encapsulate a MAC frame and does not preserve domain information in the encapsulation, whereas a backbone bridge port encapsulates the MAC frame and optionally preserves domain information in the encapsulated frame.A backbone bridge port is typically used to transport frames across a high bandwidth backbone network to another bridge unit for further processing/forwarding of the frame. Enumeration: 'access': 1, 'backbone': 2.

This attribute specifies the type of bridge port that was provisioned. It takes into consideration the bridgingMode, bridgePortConfig and the media the bridge port is linked to before branding a bridge port. Enumeration: 'fddiBridgePort': 2, 'ethernetBridgePort': 0, 'snaDlrBridgePort': 21, 'clusterTbBridgePort': 18, 'lanEmulationClientEthernet': 22, 'frameRelayBridgePort': 6, 'srtbBridgePort': 15, 'srEncapSrBridgePort': 11, 'tbsrBridgePort': 16, 'unknown': 19, 'vcpBridgePort': 9, 'clusterSrBridgePort': 17, 'srEncapTbBridgePort': 12, 'fddiEncapsulatingBridgePort': 4, 'sourceGateSrBridgePort': 13, 'sourceGateTbBridgePort': 14, 'x25BridgePort': 10, 'smdsBridgePort': 8, 'tokenRingBridgePort': 1, 'tokenBusBridgePort': 3, 'vnsBridgePort': 5, 'atmMpeBridgePort': 20, 'pppBridgePort': 7.

This attribute specifies the index into the Interface Table where in information about the media interface corresponding to the bridge port is maintained.

This attribute is indicative of the number of frames that were discarded because the time taken to process these frames exceeded the transit delay allowed for this bridge unit. This attribute is not supported by bridging and will always have a value of 0.

This attribute is indicative of the number of frames discarded because the size of the out bound frame exceeded the message transfer unit (mtu) allowed for the bridge port. Note that this counter only refers to the outbound frames for this bridge port. This counter wraps around its maximum value of 4294967295. This counter is influenced by the attribute fragmentIp. This counter is incremented when the a frame larger than the mtu allowed is encountered and cannot be fragmented. If this counter is increasing steadily, it might be useful to set the value of the attribute fragmentIp to a value of on.

This group houses all the port specific operational attributes that belong to the Stp group. The Stp group is applicable to all the bridge ports that participate in the spanning tree protocol. These attributes reflect the state of the bridge port's participation in the spanning tree protocol.

An entry in the vrPpSrseStpOperTable.

This attribute specifies the spanning tree protocol state of the bridge port. Enumeration: 'listening': 3, 'disabled': 1, 'broken': 6, 'learning': 4, 'forwarding': 5, 'blocking': 2.

This attribute specifies the type of spanning tree protocol the port is participating in. A bridge port could participate in either the ieee8021 spanning tree protocol or the dec spanning tree protocol. Enumeration: 'none': 0, 'dec': 2, 'ieee8021': 3.

This attribute specifies the path cost of the designated port of the lan segment connected to the port.

This attribute specifies the contribution of this port, to all the paths to the root bridge that include this port. This attribute pathCostOper will track the value of the attribute pathCostProv when the value of the attribute pathCostMethod is set of off.

This attribute specifies the identifier of the bridge that this port considers to be the designated bridge.

This attribute specifies the port identifier of the port on the designated bridge, attached to the same lan as this port is attached to.

This attribute is indicative of the number of times this bridge port transitioned from the learning state to the forwarding state. This counter wraps around its maximum value of 4294967295. A rapidly increasing value might be indicative of an unstable spanning tree topology.

This attribute is indicative of the number of incoming frames that were discarded because the bridge port was in the blocking state. This counter wraps around its maximum value of 4294967295.

This attribute specifies the bridge identifier of the bridge recorded as the root bridge, in the configuration BPDUs sent out by the designated bridge on the segment to which the port is attached.

This group houses all the statistical attributes applicable to all types of bridge ports and represents the common factor between them. These attributes in part reflect the state of the bridge port.

An entry in the vrPpSrseStatsTable.

This attribute is indicative of the number of frames that were discarded because the data that was abstracted, from frames coming in through this bridge port, did not conform to the format expected by the bridge logic.This counter wraps around its maximum value of 4294967295.

This attribute is indicative of the number of frames received on this bridge port that used the tinygram compression scheme.

This attribute is indicative of the number of frames transmitted out this bridge port that used the tinygram compression scheme.

This attribute is indicative of the number of frames discarded at the in filter point. This includes a) frames discarded due to application of the filter defined with PCF for the in filter point and b) the frames discarded due to domain based filtering at the in filter point. This counter wraps around its maximum value of 4294967295.

This attribute is indicative of the number of frames discarded at the out filter point. This includes: a) frames discarded due to application of the filter defined with PCF for the out filter point and b) the frames discarded due to domain based filtering at the out filter point. This counter wraps around its maximum value of 4294967295.

This group contains all port specific, provisionable attributes associated with SourceRouteBridge ports.

An entry in the vrPpSrseSrProvTable.

This attribute specifies the maximum number of hops allowed in Spanning Tree Explore and All Routes Explore frames. This value is one less than the maximum number of route descriptors allowed in a source route frame

This attribute specifies whether or not explore frames received from SourceRouteBridge ports will be sent to the SRTB-8209 translation or the encapsulated SourceRouteBridge logic. This option is used only when both the TbsrBridgePort and the SrtbBridgePort are provisioned and enabled. A value of Xlate implies that the explore frames will be sent to the Srtb translation logic and a value of Encap implies that the frames will be sent to the Encapsulated source route bridging logic. Enumeration: 'xlate': 1, 'encap': 0.

This attribute specifies the identifier for the physical LAN that this port is attached. All SourceRouteBridge ports are assigned to a physical LAN and a logical internal LAN. Current source route bridge implementations limit the lanId to a value in the range 0 to 4095.

This attribute specifies the identifier for the internal logical LAN this port is attached. All SourceRouteBridge ports are assigned to a physical LAN and a logical internal LAN. Current source route bridge implementations limit the lanId to a value in the range 0 to 4095.

This attribute specifies the value that is used to identify this bridge when more than one bridge is used to span the same two LAN segments.

This attribute specifies the maximum frame size (LLC and above) in octets, allowed by this SourceRouteBridge port. This field is used to determine whether a modification of the largest frame field of the routing control field of the routing information field is warranted.

This attribute determines how this bridge port will react when presented with a Spanning Tree Explore frame. If disabled, the Spanning Tree Explore frame is discarded regardless of the value of stpPortState. If the value of this attribute is forced, the Spanning Tree Explore frame is forwarded regardless of the value of stpPortState. autoSpan uses the stpPortState value to decide whether or not Spanning Tree Explore frames should be forwarded out this bridge port. If the port is in the forwarding state, the frame is received and transmitted otherwise the frame is discarded. Enumeration: 'disabled': 2, 'autoSpan': 1, 'forced': 3.

This attribute specifies the number of route descriptors allowed in an All Routes Explore frame received on a SourceRouteBridgePort or SourceRouteTransparentBridgePort. Current source route bridge implementations limit the areRdLimit to a value in the range 0 to 8.

This attribute specifies the number of route descriptors allowed in a Spanning Tree Explore frame received on a SourceRouteBridgePort or SourceRouteTransparentBridgePort. Current source route bridge implementations limit the steRdLimit to a value in the range 0 to 8.

This group contains all port specific statistical attributes associated with SourceRouteBridge ports.

An entry in the vrPpSrseSrStatsTable.

This attribute specifies the number of specifically routed frames that were received by this bridge port. A specifically routed frame has a route descriptor, constructed by the originating host which details an explicit route to the destination host. This counter will wrap to zero when it exceeds its maximum.

This attribute specifies the number of specifically routed frames that were transmitted from this bridge port. This counter will wrap to zero when it exceeds its maximum.

This attribute specifies the number of All Path Explore frames received on this bridge port. The All Path Explore frames are forwarded to all SourceRouteBridge ports assigned to this bridge regardless of the port's portStpStates. This counter will wrap to zero when it exceeds its maximum.

This attribute specifies the number of All Path Explore frames transmitted on this bridge port. The All Path Explore frames are forwarded to all SourceRouteBridge ports assigned to this bridge regardless of the port's portStpState state. This counter will wrap to zero when it exceeds its maximum.

This attribute specifies the number of Spanning Tree Explore frames received on this bridge port. The Spanning Tree Explore frames are only forwarded through bridge ports whose portStpState has a value of forwarding. This counter will wrap to zero when it exceeds its maximum.

This attribute specifies the number of Spanning Tree Frames transmitted on this bridge port. This counter will wrap to zero when it exceeds its maximum.

This attribute specifies the number of All Routes Explore and Spanning Tree Explore frames that were discarded due to an invalid next segment value in the routing information field. This counter will wrap to zero when it exceeds its maximum.

This attribute specifies the number of frames discarded due to the presence of a duplicate segment identifier in the route descriptor field which may indicate a loop in the network topology. This counter will wrap to zero when it exceeds its maximum.

This attribute specifies the number of All Routes Explore and Spanning Tree Explore frames discarded by this bridge port due to a frame exceeding the maximum size allowed for a route descriptor length. This counter will wrap to zero when it exceeds its maximum.

This attribute specifies the number frames received which contain duplicate LAN IDs or Tree errors. This attribute is helpful in debugging problems in networks which contain older IBM-SR bridges. This counter will wrap to zero when it exceeds its maximum.

This attributes counts the number of All Routes Explore or Spanning Tree Explore frames that were discarded because the last LAN ID in the routing information field did not equal the LAN ID. This counter will wrap to zero when it exceeds its maximum.

This attribute is indicative of the number of explorer frames discarded due to fact that the outbound SourceRouteBridge port was disabled or deleted. This counter will wrap to zero when it exceeds its maximum.

This attribute specifies the number of frames discarded due to receiving a frame with a target LAN ID which did not match the internal LAN ID of the receiving bridge port. This counter will wrap to zero when it exceeds its maximum.

This entry controls the addition and deletion of vrPpTbse components.

A single entry in the table represents a single vrPpTbse component.

This variable is used as the basis for SNMP naming of vrPpTbse components. These components can be added and deleted.

This variable provides the component's string name for use with the ASCII Console Interface

This variable represents the storage type value for the vrPpTbse tables.

This variable represents the index for the vrPpTbse tables.

This group houses all the provisionable attributes that belong to the this group. This group of attributes is applicable to all types of bridge ports and represent the common factor between them. These attributes influence the working of a bridge port.

An entry in the vrPpTbseProvTable.

This attribute specifies the type of translation to be performed on frames carrying IPX packets. Ethernet frames carrying IPX payload could be translated to IEEE 802.3 frames (with the same IPX payload) or vice- versa. The main reason to do so is to allow the bridge unit to consistently forward one type of frames carrying IPX packets. Translations can be turned off altogether in which case the IPX frames will pass through the bridge unit unchanged. Enumeration: 'snap': 3, 'ethernet': 2, 'sap': 4, 'off': 0, 'ieee8023': 1.

This attribute specifies if or not outbound frames carrying IP datagrams should be fragmented to conform to message transfer unit (mtu) sizes dictated by the media. Enumeration: 'on': 1, 'off': 0.

This attribute specifies if the frames should be ordered or not before they are transmitted through a bridge port. If this attribute has a value of ordered the received frames are ordered as in the original message, before they are transmitted out through a bridge port. If it has a value of notOrdered, received then frames pass through the bridge unit in the order they are received. This feature can be used over multiple telecommunication links to increase data flow. Please note that this attribute only affects link protocols and is ineffective with lan media. Enumeration: 'notOrdered': 1, 'ordered': 0.

This attribute is indicative of the state of the MAC address format conversion process for ARP/RARP frames. The MAC addresses may be translated if need be from a canonical format to a non-canonical format, based on the needs of the associated media. If this attribute is set to a value of on then all Mac addresses will converted if need be to suit the format of mac address, the outgoing media will support. If this attribute is set to a value of off no such conversion takes place. Enumeration: 'on': 1, 'off': 0.

This attribute is indicative of the unique number assigned to the bridge port. It is used for SNMP management of this bridge port and in spanning tree as an identifier this bridge port. Notes regarding portNum: Escape routines exist for initializing, copying, and deleting port numbers. This is necessary because SNMP requires a unique port instance identifier. The initPortNum escape routine sets the port number to a value in the range 1-255 for this purpose. The setCopiedPortNum escape routine exists to maintain the uniqueness of the port number in cases when one port is copied to another. When a bridge port is deleted, the releasePortNum escape routine places the port number being released into a pending deletion state. This is because the port number cannot be re-allocated until the port is truely deleted in the current view. This is necessary since there is no guarantee of order when processing changes to multiple protocol ports so without the pending deletion state, the same port number could be temporarily assigned to two ports for a short period of time. The portNum is set as component critical since bridging also uses the port number as a key for indexing into its data structures. If a port is deleted then re-added under the same protocol port, CAS treats the change as a SET to the portNum attribute.

This attribute specifies the media type the frame must be in before it is to be forwarded over the outbound supported WAN Bridge Protocol Port. The attribute only applies to outbound Bridge Protocol Port. For supported bridge ports, if the attribute value remains set to the default value of unaltered then there will be no frame conversion. When the value is set to the value ethernetConv then all frames being forwarded out the outbound WAN Port will be converted to ethernet before forwarding takes place. The only outbound WAN medias that currently support conversion are: FR (Frame Relay) and VNS. All other medias will fail the Bridge Port semantic check when attempts are made to alter this attribute. The following is an example of what the user may be able to do. Frames originating from a Token Ring are to be flooded out onto another Token Ring and a Frame Relay Port. The token ring Outbound port performs no translation, yet the FR Port has the outboundFrameMediaType attribute set to ethernetConv which results in the frame being translated into Ethernet format from Token Ring format before Frame Relay does its encapsulation and transmits over the FR port. Enumeration: 'unaltered': 1, 'ethernetConv': 2.

This group houses all the port specific provisionable attributes that belong to the Tb group. The Tb group is only applicable bridge port types that operate in the TB mode. These attributes in part influence the working of a bridge port operating in the TB mode.

An entry in the vrPpTbseTbProvTable.

This attribute specifies whether the port secure feature is enabled. The secure feature, if enabled causes the following things to happen: a) disallows dynamic learning, b) disallows frames to be forwarded that do not satisfy the following condition: the mac address of the source should be found in the forwarding table and the destination mac address of the frame should also be found in the forwarding table. In addition to this, the port the frame was received on should figure as the in port, given the destination mac address found in the frame. c) disallows frames to be forwarded if the allowed to go port map for the destination mac address is empty. This feature in effect allows the user to choose the hosts that can generate traffic and the hosts that can receive traffic through this bridge unit. Enumeration: 'disabled': 0, 'enabled': 1.

This group houses all the port specific provisionable attributes that belong to the Stp group. The Stp group is applicable to all the bridge ports that participate in the spanning tree protocol. These attributes influence the participation of the bridge port in the spanning tree protocol.

An entry in the vrPpTbseStpProvTable.

This attribute defines the current administrative state for this component. enabled indicates that the component is available for operation. disabled indicates the component is unavailable for operation. Enumeration: 'down': 2, 'up': 1.

This attribute specifies whether or not spanning tree protocol state for this bridge port is controlled by the spanning tree protocol. In essence it indicates the participation of this bridge port in the spanning tree protocol, by accepting and acting on received bridge protocol data units and by sending out the same. on signifies that this bridge port's spanning tree port state is controlled by the spanning tree protocol. A value of off signifies that the spanning tree port state of this bridge port is unaffected by the spanning tree protocol. This in effect puts the bridge port out of reach of the spanning tree protocol and in the forwarding state. Care should be taken while assigning a value of off to this attribute, as this might cause network loops. Please do not set this attribute to off unless you are absolutely sure about the effect of such an action on your network topology. Enumeration: 'on': 1, 'off': 0.

This attribute specifies the type of spanning tree protocol the port is participating in. A bridge port could participate in either the ieee8021 spanning tree protocol or the dec spanning tree protocol. If the value of the attribute protocolSpec in the SpanningTreeProtocol component, provisioned under the TransparentBridge component is in conflict with the value of this attribute, the value of the protocolSpec attribute will prevail. Prevailing stp type is reflected in the value of the attribute stpTypeOper. Enumeration: 'dec': 2, 'ieee8021': 3.

This attribute specifies the value for port priority, which is contained in the first octet of the port identifier. Valid values are as follows: 1) 0..255 for stp type DEC and 2) 0..65535 for stp type IEEE.

This attribute specifies the contribution of this port, to all the paths to the root bridge that include this port. Please note that the value of the attribute pathCostMethod is applied only when the value of the attribute pathCostMethod is set to on and is ignored if otherwise.

This attribute specifies the method used by the bridging logic, to calculate the path cost to the bridge considered to be the root bridge in the spanning tree topology. This attribute should be set to off before attempting to provision a value for pathCostProv. Enumeration: 'dec': 2, 'off': 1, 'ieee8021': 3.

This group houses all the provisionable, domain specific attributes for a non-encapsulating bridge port.

An entry in the vrPpTbseDIProvTable.

This attribute specifies the domain number associated with this bridge port. Domain numbers are used for confining frames to a domain. Domain based filtering provides a complete segregation of traffic based on domain number associated with frames. There can exist only sixteen domains when a spanning tree is desired specific to each domain. When there is only a single spanning tree spanning all the domains the maximum number of domains possible are 4294967293. This attribute is of no relevance when associated with backbone bridge port. Its value is ignored in such a situation.

This attribute specifies if the domain information should be preserved or embedded in the frame header. This attribute applies only to backbone ports and does not affect the access bridge ports. By setting this attribute to a value of on, domain information could be preserved in frames being tunnelled across the a backbone, so that this information can be deciphered at the other end of the backbone tunnel. This preserves the integrity of the domains thus preventing domain breaches while tunnelling frames across backbone network. If the value of this attribute is set to off then domain information is not preserved in the header of the frames tunnelling through the backbone. This eliminates the overhead incurred to preserve domain information across the backbone while tunnelling frames across it. Preserve domain is relevant when used in conjunction with the following media: FDDI, ATM MPE, Frame Relay and PPP. It is ignored when used with other types of media. Enumeration: 'on': 1, 'off': 0.

This group contains the three OSI State attributes. The descriptions generically indicate what each state attribute implies about the component. Note that not all the values and state combinations described here are supported by every component which uses this group. For component-specific information and the valid state combinations, refer to NTP 241-7001-150, Passport Operations and Maintenance Guide.

An entry in the vrPpTbseStateTable.

This attribute indicates the OSI Administrative State of the component. The value locked indicates that the component is administratively prohibited from providing services for its users. A Lock or Lock - force command has been previously issued for this component. When the value is locked, the value of usageState must be idle. The value shuttingDown indicates that the component is administratively permitted to provide service to its existing users only. A Lock command was issued against the component and it is in the process of shutting down. The value unlocked indicates that the component is administratively permitted to provide services for its users. To enter this state, issue an Unlock command to this component. Enumeration: 'locked': 0, 'shuttingDown': 2, 'unlocked': 1.

This attribute indicates the OSI Operational State of the component. The value enabled indicates that the component is available for operation. Note that if adminState is locked, it would still not be providing service. The value disabled indicates that the component is not available for operation. For example, something is wrong with the component itself, or with another component on which this one depends. If the value is disabled, the usageState must be idle. Enumeration: 'disabled': 0, 'enabled': 1.

This attribute indicates the OSI Usage State of the component. The value idle indicates that the component is not currently in use. The value active indicates that the component is in use and has spare capacity to provide for additional users. The value busy indicates that the component is in use and has no spare operating capacity for additional users at this time. Enumeration: 'active': 1, 'idle': 0, 'busy': 2.

This group includes the Operational Status attribute. This attribute defines the current operational state of this component.

An entry in the vrPpTbseOperStatusTable.

The current state of the interface. The up state indicates the interface is operational and capable of forwarding packets. The down state indicates the interface is not operational, thus unable to forward packets. testing state indicates that no operational packets can be passed. Enumeration: 'down': 2, 'testing': 3, 'up': 1.

This group houses all the operational attributes belonging to the base group. The base group of attributes is applicable to all types of bridge ports and represent the common factor between them. These attributes in part, reflect the state of a bridge port.

An entry in the vrPpTbseOperTable.

The attribute portName is a string of the form 'BridgePortName-i', where BridgePortName is the abbreviation of the corresponding bridge port and i is the instance identifier of the ProtocolPort, the bridge port is provisioned under. For example a TransparentBridgePort provisioned under ProtocolPort/myport would have a name TBP-myport.

This attribute specifies the accumulated up time of this bridge port since the last reset occurred.

This attribute specifies the accumulated down time of this bridge port since the last reset occurred.

This attribute specifies the mode of bridging this port can support. It in turn implies the format of frames, this bridge port can process and forward. Enumeration: 'unknown': 1, 'tb': 2, 'srt': 4, 'sr': 3.

This attribute specifies the bridge port's configuration. It indicates if the bridge port is operating as an access port or as a backbone port. An access bridge port does not encapsulate a MAC frame and does not preserve domain information in the encapsulation, whereas a backbone bridge port encapsulates the MAC frame and optionally preserves domain information in the encapsulated frame.A backbone bridge port is typically used to transport frames across a high bandwidth backbone network to another bridge unit for further processing/forwarding of the frame. Enumeration: 'access': 1, 'backbone': 2.

This attribute specifies the type of bridge port that was provisioned. It takes into consideration the bridgingMode, bridgePortConfig and the media the bridge port is linked to before branding a bridge port. Enumeration: 'fddiBridgePort': 2, 'ethernetBridgePort': 0, 'snaDlrBridgePort': 21, 'clusterTbBridgePort': 18, 'lanEmulationClientEthernet': 22, 'frameRelayBridgePort': 6, 'srtbBridgePort': 15, 'srEncapSrBridgePort': 11, 'tbsrBridgePort': 16, 'unknown': 19, 'vcpBridgePort': 9, 'clusterSrBridgePort': 17, 'srEncapTbBridgePort': 12, 'fddiEncapsulatingBridgePort': 4, 'sourceGateSrBridgePort': 13, 'sourceGateTbBridgePort': 14, 'x25BridgePort': 10, 'smdsBridgePort': 8, 'tokenRingBridgePort': 1, 'tokenBusBridgePort': 3, 'vnsBridgePort': 5, 'atmMpeBridgePort': 20, 'pppBridgePort': 7.

This attribute specifies the index into the Interface Table where in information about the media interface corresponding to the bridge port is maintained.

This attribute is indicative of the number of frames that were discarded because the time taken to process these frames exceeded the transit delay allowed for this bridge unit. This attribute is not supported by bridging and will always have a value of 0.

This attribute is indicative of the number of frames discarded because the size of the out bound frame exceeded the message transfer unit (mtu) allowed for the bridge port. Note that this counter only refers to the outbound frames for this bridge port. This counter wraps around its maximum value of 4294967295. This counter is influenced by the attribute fragmentIp. This counter is incremented when the a frame larger than the mtu allowed is encountered and cannot be fragmented. If this counter is increasing steadily, it might be useful to set the value of the attribute fragmentIp to a value of on.

This group houses all the port specific operational attributes that belong to the Tb group. This group also houses all the port specific statistical attributes that belong to the Tb group. The Tb group is only applicable bridge port types that operate in the TB mode. These attributes reflect the state of a bridge port operating in the TB mode

An entry in the vrPpTbseTbOperTable.

This attribute specifies the maximum size of the information field in a TB frame. This excludes the header field.

This attribute is indicative of the number of incoming frames that were discarded because: a) the value of the secureOption attribute was set to on and b) it is not allowed to receive frames originating from the mac address found in the source address field of the frame (source mac address look up in the forwarding table failed.) on this bridge port. c) for the destination mac address found in the frame, the port the frame was received on does not appear as in port in the corresponding static table entry. Permission to receive frames from a mac address is granted via the static table entries. This attribute, badVerifyDiscards, is directly influenced by: 1. secureOption and 2. the static table entries. This counter wraps around its maximum value of 4294967295.

This attribute is indicative of the number frames discarded because the MAC address found in the destination field did not match the local MAC address of the bridge port. This counter is only applicable for the protocols that are being routed currently.This counter wraps around its maximum value of 4294967295.

This attribute is indicative of the number of frames that were discarded because of the following two reasons: a) there was no entry for the 'allowed to go' field in the static table entry, where the input port is this bridge port. b) for spanning tree bpdus that are locally processed. This counter wraps around its maximum value of 4294967295. It might prove useful to check the static table entry corresponding to the bridge port in question, if this counter consistently displays a high value. Ideally this counter should be as low as possible.

This attribute is indicative of the number of incoming frames that a) were discarded because of the fact that the bridge port, the frame is to go out of matches the bridge port it came in from or b) if the stp port state of the out port is not forwarding. This counter wraps around its maximum value of 4294967295.

This attribute is indicative of the number of frames that were discarded while this bridge port was in a state other than the forwarding state. While in learning state the frame is discarded after the information from its header is learnt. This counter wraps around its maximum value of 4294967295.

This attribute is indicative of the number of frames that were received by this bridge port and were discarded by the forwarding process. This includes frames that could have been discarded due to filtering. A repidly increasing value for this attribute could indicate a shrtage of resource in terms of memory needed to process the incoming frames. More memory can be provisioned through the VirtualRouter's memory manager.

This attribute is indicative of the number of frames that have been received by this port from its segment. Note that a frame received on this bridge port is counted if and only if it can be processed by the bridge logic contained in this bridge unit, a protocol that can be processed by the bridge logic. This counter wraps around its maximum value of 4294967295.

This attribute is indicative of the number of frames that have been transmitted out this bridge port. Note that frame transmitted out this bridge port is counted if and only if it is for a protocol being processed by the bridge unit. This also includes management frames.This counter wraps around its maximum value of 4294967295.

This group houses all the port specific operational attributes that belong to the Stp group. The Stp group is applicable to all the bridge ports that participate in the spanning tree protocol. These attributes reflect the state of the bridge port's participation in the spanning tree protocol.

An entry in the vrPpTbseStpOperTable.

This attribute specifies the spanning tree protocol state of the bridge port. Enumeration: 'listening': 3, 'disabled': 1, 'broken': 6, 'learning': 4, 'forwarding': 5, 'blocking': 2.

This attribute specifies the type of spanning tree protocol the port is participating in. A bridge port could participate in either the ieee8021 spanning tree protocol or the dec spanning tree protocol. Enumeration: 'none': 0, 'dec': 2, 'ieee8021': 3.

This attribute specifies the path cost of the designated port of the lan segment connected to the port.

This attribute specifies the contribution of this port, to all the paths to the root bridge that include this port. This attribute pathCostOper will track the value of the attribute pathCostProv when the value of the attribute pathCostMethod is set of off.

This attribute specifies the identifier of the bridge that this port considers to be the designated bridge.

This attribute specifies the port identifier of the port on the designated bridge, attached to the same lan as this port is attached to.

This attribute is indicative of the number of times this bridge port transitioned from the learning state to the forwarding state. This counter wraps around its maximum value of 4294967295. A rapidly increasing value might be indicative of an unstable spanning tree topology.

This attribute is indicative of the number of incoming frames that were discarded because the bridge port was in the blocking state. This counter wraps around its maximum value of 4294967295.

This attribute specifies the bridge identifier of the bridge recorded as the root bridge, in the configuration BPDUs sent out by the designated bridge on the segment to which the port is attached.

This group houses all the statistical attributes applicable to all types of bridge ports and represents the common factor between them. These attributes in part reflect the state of the bridge port.

An entry in the vrPpTbseStatsTable.

This attribute is indicative of the number of frames that were discarded because the data that was abstracted, from frames coming in through this bridge port, did not conform to the format expected by the bridge logic.This counter wraps around its maximum value of 4294967295.

This attribute is indicative of the number of frames received on this bridge port that used the tinygram compression scheme.

This attribute is indicative of the number of frames transmitted out this bridge port that used the tinygram compression scheme.

This attribute is indicative of the number of frames discarded at the in filter point. This includes a) frames discarded due to application of the filter defined with PCF for the in filter point and b) the frames discarded due to domain based filtering at the in filter point. This counter wraps around its maximum value of 4294967295.

This attribute is indicative of the number of frames discarded at the out filter point. This includes: a) frames discarded due to application of the filter defined with PCF for the out filter point and b) the frames discarded due to domain based filtering at the out filter point. This counter wraps around its maximum value of 4294967295.

This entry controls the addition and deletion of vrPpSrsg components.

A single entry in the table represents a single vrPpSrsg component.

This variable is used as the basis for SNMP naming of vrPpSrsg components. These components can be added and deleted.

This variable provides the component's string name for use with the ASCII Console Interface

This variable represents the storage type value for the vrPpSrsg tables.

This variable represents the index for the vrPpSrsg tables.

This group houses all the provisionable attributes that belong to the this group. This group of attributes is applicable to all types of bridge ports and represent the common factor between them. These attributes influence the working of a bridge port.

An entry in the vrPpSrsgProvTable.

This attribute specifies the type of translation to be performed on frames carrying IPX packets. Ethernet frames carrying IPX payload could be translated to IEEE 802.3 frames (with the same IPX payload) or vice- versa. The main reason to do so is to allow the bridge unit to consistently forward one type of frames carrying IPX packets. Translations can be turned off altogether in which case the IPX frames will pass through the bridge unit unchanged. Enumeration: 'snap': 3, 'ethernet': 2, 'sap': 4, 'off': 0, 'ieee8023': 1.

This attribute specifies if or not outbound frames carrying IP datagrams should be fragmented to conform to message transfer unit (mtu) sizes dictated by the media. Enumeration: 'on': 1, 'off': 0.

This attribute specifies if the frames should be ordered or not before they are transmitted through a bridge port. If this attribute has a value of ordered the received frames are ordered as in the original message, before they are transmitted out through a bridge port. If it has a value of notOrdered, received then frames pass through the bridge unit in the order they are received. This feature can be used over multiple telecommunication links to increase data flow. Please note that this attribute only affects link protocols and is ineffective with lan media. Enumeration: 'notOrdered': 1, 'ordered': 0.

This attribute is indicative of the state of the MAC address format conversion process for ARP/RARP frames. The MAC addresses may be translated if need be from a canonical format to a non-canonical format, based on the needs of the associated media. If this attribute is set to a value of on then all Mac addresses will converted if need be to suit the format of mac address, the outgoing media will support. If this attribute is set to a value of off no such conversion takes place. Enumeration: 'on': 1, 'off': 0.

This attribute is indicative of the unique number assigned to the bridge port. It is used for SNMP management of this bridge port and in spanning tree as an identifier this bridge port. Notes regarding portNum: Escape routines exist for initializing, copying, and deleting port numbers. This is necessary because SNMP requires a unique port instance identifier. The initPortNum escape routine sets the port number to a value in the range 1-255 for this purpose. The setCopiedPortNum escape routine exists to maintain the uniqueness of the port number in cases when one port is copied to another. When a bridge port is deleted, the releasePortNum escape routine places the port number being released into a pending deletion state. This is because the port number cannot be re-allocated until the port is truely deleted in the current view. This is necessary since there is no guarantee of order when processing changes to multiple protocol ports so without the pending deletion state, the same port number could be temporarily assigned to two ports for a short period of time. The portNum is set as component critical since bridging also uses the port number as a key for indexing into its data structures. If a port is deleted then re-added under the same protocol port, CAS treats the change as a SET to the portNum attribute.

This attribute specifies the media type the frame must be in before it is to be forwarded over the outbound supported WAN Bridge Protocol Port. The attribute only applies to outbound Bridge Protocol Port. For supported bridge ports, if the attribute value remains set to the default value of unaltered then there will be no frame conversion. When the value is set to the value ethernetConv then all frames being forwarded out the outbound WAN Port will be converted to ethernet before forwarding takes place. The only outbound WAN medias that currently support conversion are: FR (Frame Relay) and VNS. All other medias will fail the Bridge Port semantic check when attempts are made to alter this attribute. The following is an example of what the user may be able to do. Frames originating from a Token Ring are to be flooded out onto another Token Ring and a Frame Relay Port. The token ring Outbound port performs no translation, yet the FR Port has the outboundFrameMediaType attribute set to ethernetConv which results in the frame being translated into Ethernet format from Token Ring format before Frame Relay does its encapsulation and transmits over the FR port. Enumeration: 'unaltered': 1, 'ethernetConv': 2.

This group houses all the port specific provisionable attributes that belong to the Stp group. The Stp group is applicable to all the bridge ports that participate in the spanning tree protocol. These attributes influence the participation of the bridge port in the spanning tree protocol.

An entry in the vrPpSrsgStpProvTable.

This attribute defines the current administrative state for this component. enabled indicates that the component is available for operation. disabled indicates the component is unavailable for operation. Enumeration: 'down': 2, 'up': 1.

This attribute specifies whether or not spanning tree protocol state for this bridge port is controlled by the spanning tree protocol. In essence it indicates the participation of this bridge port in the spanning tree protocol, by accepting and acting on received bridge protocol data units and by sending out the same. on signifies that this bridge port's spanning tree port state is controlled by the spanning tree protocol. A value of off signifies that the spanning tree port state of this bridge port is unaffected by the spanning tree protocol. This in effect puts the bridge port out of reach of the spanning tree protocol and in the forwarding state. Care should be taken while assigning a value of off to this attribute, as this might cause network loops. Please do not set this attribute to off unless you are absolutely sure about the effect of such an action on your network topology. Enumeration: 'on': 1, 'off': 0.

This attribute specifies the type of spanning tree protocol the port is participating in. A bridge port could participate in either the ieee8021 spanning tree protocol or the dec spanning tree protocol. If the value of the attribute protocolSpec in the SpanningTreeProtocol component, provisioned under the TransparentBridge component is in conflict with the value of this attribute, the value of the protocolSpec attribute will prevail. Prevailing stp type is reflected in the value of the attribute stpTypeOper. Enumeration: 'dec': 2, 'ieee8021': 3.

This attribute specifies the value for port priority, which is contained in the first octet of the port identifier. Valid values are as follows: 1) 0..255 for stp type DEC and 2) 0..65535 for stp type IEEE.

This attribute specifies the contribution of this port, to all the paths to the root bridge that include this port. Please note that the value of the attribute pathCostMethod is applied only when the value of the attribute pathCostMethod is set to on and is ignored if otherwise.

This attribute specifies the method used by the bridging logic, to calculate the path cost to the bridge considered to be the root bridge in the spanning tree topology. This attribute should be set to off before attempting to provision a value for pathCostProv. Enumeration: 'dec': 2, 'off': 1, 'ieee8021': 3.

This group houses all the provisionable, domain specific attributes for a non-encapsulating bridge port.

An entry in the vrPpSrsgDIProvTable.

This attribute specifies the domain number associated with this bridge port. Domain numbers are used for confining frames to a domain. Domain based filtering provides a complete segregation of traffic based on domain number associated with frames. There can exist only sixteen domains when a spanning tree is desired specific to each domain. When there is only a single spanning tree spanning all the domains the maximum number of domains possible are 4294967293. This attribute is of no relevance when associated with backbone bridge port. Its value is ignored in such a situation.

This attribute specifies if the domain information should be preserved or embedded in the frame header. This attribute applies only to backbone ports and does not affect the access bridge ports. By setting this attribute to a value of on, domain information could be preserved in frames being tunnelled across the a backbone, so that this information can be deciphered at the other end of the backbone tunnel. This preserves the integrity of the domains thus preventing domain breaches while tunnelling frames across backbone network. If the value of this attribute is set to off then domain information is not preserved in the header of the frames tunnelling through the backbone. This eliminates the overhead incurred to preserve domain information across the backbone while tunnelling frames across it. Preserve domain is relevant when used in conjunction with the following media: FDDI, ATM MPE, Frame Relay and PPP. It is ignored when used with other types of media. Enumeration: 'on': 1, 'off': 0.

This group contains the three OSI State attributes. The descriptions generically indicate what each state attribute implies about the component. Note that not all the values and state combinations described here are supported by every component which uses this group. For component-specific information and the valid state combinations, refer to NTP 241-7001-150, Passport Operations and Maintenance Guide.

An entry in the vrPpSrsgStateTable.

This attribute indicates the OSI Administrative State of the component. The value locked indicates that the component is administratively prohibited from providing services for its users. A Lock or Lock - force command has been previously issued for this component. When the value is locked, the value of usageState must be idle. The value shuttingDown indicates that the component is administratively permitted to provide service to its existing users only. A Lock command was issued against the component and it is in the process of shutting down. The value unlocked indicates that the component is administratively permitted to provide services for its users. To enter this state, issue an Unlock command to this component. Enumeration: 'locked': 0, 'shuttingDown': 2, 'unlocked': 1.

This attribute indicates the OSI Operational State of the component. The value enabled indicates that the component is available for operation. Note that if adminState is locked, it would still not be providing service. The value disabled indicates that the component is not available for operation. For example, something is wrong with the component itself, or with another component on which this one depends. If the value is disabled, the usageState must be idle. Enumeration: 'disabled': 0, 'enabled': 1.

This attribute indicates the OSI Usage State of the component. The value idle indicates that the component is not currently in use. The value active indicates that the component is in use and has spare capacity to provide for additional users. The value busy indicates that the component is in use and has no spare operating capacity for additional users at this time. Enumeration: 'active': 1, 'idle': 0, 'busy': 2.

This group includes the Operational Status attribute. This attribute defines the current operational state of this component.

An entry in the vrPpSrsgOperStatusTable.

The current state of the interface. The up state indicates the interface is operational and capable of forwarding packets. The down state indicates the interface is not operational, thus unable to forward packets. testing state indicates that no operational packets can be passed. Enumeration: 'down': 2, 'testing': 3, 'up': 1.

This group houses all the operational attributes belonging to the base group. The base group of attributes is applicable to all types of bridge ports and represent the common factor between them. These attributes in part, reflect the state of a bridge port.

An entry in the vrPpSrsgOperTable.

The attribute portName is a string of the form 'BridgePortName-i', where BridgePortName is the abbreviation of the corresponding bridge port and i is the instance identifier of the ProtocolPort, the bridge port is provisioned under. For example a TransparentBridgePort provisioned under ProtocolPort/myport would have a name TBP-myport.

This attribute specifies the accumulated up time of this bridge port since the last reset occurred.

This attribute specifies the accumulated down time of this bridge port since the last reset occurred.

This attribute specifies the mode of bridging this port can support. It in turn implies the format of frames, this bridge port can process and forward. Enumeration: 'unknown': 1, 'tb': 2, 'srt': 4, 'sr': 3.

This attribute specifies the bridge port's configuration. It indicates if the bridge port is operating as an access port or as a backbone port. An access bridge port does not encapsulate a MAC frame and does not preserve domain information in the encapsulation, whereas a backbone bridge port encapsulates the MAC frame and optionally preserves domain information in the encapsulated frame.A backbone bridge port is typically used to transport frames across a high bandwidth backbone network to another bridge unit for further processing/forwarding of the frame. Enumeration: 'access': 1, 'backbone': 2.

This attribute specifies the type of bridge port that was provisioned. It takes into consideration the bridgingMode, bridgePortConfig and the media the bridge port is linked to before branding a bridge port. Enumeration: 'fddiBridgePort': 2, 'ethernetBridgePort': 0, 'snaDlrBridgePort': 21, 'clusterTbBridgePort': 18, 'lanEmulationClientEthernet': 22, 'frameRelayBridgePort': 6, 'srtbBridgePort': 15, 'srEncapSrBridgePort': 11, 'tbsrBridgePort': 16, 'unknown': 19, 'vcpBridgePort': 9, 'clusterSrBridgePort': 17, 'srEncapTbBridgePort': 12, 'fddiEncapsulatingBridgePort': 4, 'sourceGateSrBridgePort': 13, 'sourceGateTbBridgePort': 14, 'x25BridgePort': 10, 'smdsBridgePort': 8, 'tokenRingBridgePort': 1, 'tokenBusBridgePort': 3, 'vnsBridgePort': 5, 'atmMpeBridgePort': 20, 'pppBridgePort': 7.

This attribute specifies the index into the Interface Table where in information about the media interface corresponding to the bridge port is maintained.

This attribute is indicative of the number of frames that were discarded because the time taken to process these frames exceeded the transit delay allowed for this bridge unit. This attribute is not supported by bridging and will always have a value of 0.

This attribute is indicative of the number of frames discarded because the size of the out bound frame exceeded the message transfer unit (mtu) allowed for the bridge port. Note that this counter only refers to the outbound frames for this bridge port. This counter wraps around its maximum value of 4294967295. This counter is influenced by the attribute fragmentIp. This counter is incremented when the a frame larger than the mtu allowed is encountered and cannot be fragmented. If this counter is increasing steadily, it might be useful to set the value of the attribute fragmentIp to a value of on.

This group houses all the port specific operational attributes that belong to the Stp group. The Stp group is applicable to all the bridge ports that participate in the spanning tree protocol. These attributes reflect the state of the bridge port's participation in the spanning tree protocol.

An entry in the vrPpSrsgStpOperTable.

This attribute specifies the spanning tree protocol state of the bridge port. Enumeration: 'listening': 3, 'disabled': 1, 'broken': 6, 'learning': 4, 'forwarding': 5, 'blocking': 2.

This attribute specifies the type of spanning tree protocol the port is participating in. A bridge port could participate in either the ieee8021 spanning tree protocol or the dec spanning tree protocol. Enumeration: 'none': 0, 'dec': 2, 'ieee8021': 3.

This attribute specifies the path cost of the designated port of the lan segment connected to the port.

This attribute specifies the contribution of this port, to all the paths to the root bridge that include this port. This attribute pathCostOper will track the value of the attribute pathCostProv when the value of the attribute pathCostMethod is set of off.

This attribute specifies the identifier of the bridge that this port considers to be the designated bridge.

This attribute specifies the port identifier of the port on the designated bridge, attached to the same lan as this port is attached to.

This attribute is indicative of the number of times this bridge port transitioned from the learning state to the forwarding state. This counter wraps around its maximum value of 4294967295. A rapidly increasing value might be indicative of an unstable spanning tree topology.

This attribute is indicative of the number of incoming frames that were discarded because the bridge port was in the blocking state. This counter wraps around its maximum value of 4294967295.

This attribute specifies the bridge identifier of the bridge recorded as the root bridge, in the configuration BPDUs sent out by the designated bridge on the segment to which the port is attached.

This group houses all the statistical attributes applicable to all types of bridge ports and represents the common factor between them. These attributes in part reflect the state of the bridge port.

An entry in the vrPpSrsgStatsTable.

This attribute is indicative of the number of frames that were discarded because the data that was abstracted, from frames coming in through this bridge port, did not conform to the format expected by the bridge logic.This counter wraps around its maximum value of 4294967295.

This attribute is indicative of the number of frames received on this bridge port that used the tinygram compression scheme.

This attribute is indicative of the number of frames transmitted out this bridge port that used the tinygram compression scheme.

This attribute is indicative of the number of frames discarded at the in filter point. This includes a) frames discarded due to application of the filter defined with PCF for the in filter point and b) the frames discarded due to domain based filtering at the in filter point. This counter wraps around its maximum value of 4294967295.

This attribute is indicative of the number of frames discarded at the out filter point. This includes: a) frames discarded due to application of the filter defined with PCF for the out filter point and b) the frames discarded due to domain based filtering at the out filter point. This counter wraps around its maximum value of 4294967295.

This group contains all port specific, provisionable attributes associated with SourceRouteBridge ports.

An entry in the vrPpSrsgSrProvTable.

This attribute specifies the maximum number of hops allowed in Spanning Tree Explore and All Routes Explore frames. This value is one less than the maximum number of route descriptors allowed in a source route frame

This attribute specifies whether or not explore frames received from SourceRouteBridge ports will be sent to the SRTB-8209 translation or the encapsulated SourceRouteBridge logic. This option is used only when both the TbsrBridgePort and the SrtbBridgePort are provisioned and enabled. A value of Xlate implies that the explore frames will be sent to the Srtb translation logic and a value of Encap implies that the frames will be sent to the Encapsulated source route bridging logic. Enumeration: 'xlate': 1, 'encap': 0.

This attribute specifies the identifier for the physical LAN that this port is attached. All SourceRouteBridge ports are assigned to a physical LAN and a logical internal LAN. Current source route bridge implementations limit the lanId to a value in the range 0 to 4095.

This attribute specifies the identifier for the internal logical LAN this port is attached. All SourceRouteBridge ports are assigned to a physical LAN and a logical internal LAN. Current source route bridge implementations limit the lanId to a value in the range 0 to 4095.

This attribute specifies the value that is used to identify this bridge when more than one bridge is used to span the same two LAN segments.

This attribute specifies the maximum frame size (LLC and above) in octets, allowed by this SourceRouteBridge port. This field is used to determine whether a modification of the largest frame field of the routing control field of the routing information field is warranted.

This attribute determines how this bridge port will react when presented with a Spanning Tree Explore frame. If disabled, the Spanning Tree Explore frame is discarded regardless of the value of stpPortState. If the value of this attribute is forced, the Spanning Tree Explore frame is forwarded regardless of the value of stpPortState. autoSpan uses the stpPortState value to decide whether or not Spanning Tree Explore frames should be forwarded out this bridge port. If the port is in the forwarding state, the frame is received and transmitted otherwise the frame is discarded. Enumeration: 'disabled': 2, 'autoSpan': 1, 'forced': 3.

This attribute specifies the number of route descriptors allowed in an All Routes Explore frame received on a SourceRouteBridgePort or SourceRouteTransparentBridgePort. Current source route bridge implementations limit the areRdLimit to a value in the range 0 to 8.

This attribute specifies the number of route descriptors allowed in a Spanning Tree Explore frame received on a SourceRouteBridgePort or SourceRouteTransparentBridgePort. Current source route bridge implementations limit the steRdLimit to a value in the range 0 to 8.

This group contains all port specific statistical attributes associated with SourceRouteBridge ports.

An entry in the vrPpSrsgSrStatsTable.

This attribute specifies the number of specifically routed frames that were received by this bridge port. A specifically routed frame has a route descriptor, constructed by the originating host which details an explicit route to the destination host. This counter will wrap to zero when it exceeds its maximum.

This attribute specifies the number of specifically routed frames that were transmitted from this bridge port. This counter will wrap to zero when it exceeds its maximum.

This attribute specifies the number of All Path Explore frames received on this bridge port. The All Path Explore frames are forwarded to all SourceRouteBridge ports assigned to this bridge regardless of the port's portStpStates. This counter will wrap to zero when it exceeds its maximum.

This attribute specifies the number of All Path Explore frames transmitted on this bridge port. The All Path Explore frames are forwarded to all SourceRouteBridge ports assigned to this bridge regardless of the port's portStpState state. This counter will wrap to zero when it exceeds its maximum.

This attribute specifies the number of Spanning Tree Explore frames received on this bridge port. The Spanning Tree Explore frames are only forwarded through bridge ports whose portStpState has a value of forwarding. This counter will wrap to zero when it exceeds its maximum.

This attribute specifies the number of Spanning Tree Frames transmitted on this bridge port. This counter will wrap to zero when it exceeds its maximum.

This attribute specifies the number of All Routes Explore and Spanning Tree Explore frames that were discarded due to an invalid next segment value in the routing information field. This counter will wrap to zero when it exceeds its maximum.

This attribute specifies the number of frames discarded due to the presence of a duplicate segment identifier in the route descriptor field which may indicate a loop in the network topology. This counter will wrap to zero when it exceeds its maximum.

This attribute specifies the number of All Routes Explore and Spanning Tree Explore frames discarded by this bridge port due to a frame exceeding the maximum size allowed for a route descriptor length. This counter will wrap to zero when it exceeds its maximum.

This attribute specifies the number frames received which contain duplicate LAN IDs or Tree errors. This attribute is helpful in debugging problems in networks which contain older IBM-SR bridges. This counter will wrap to zero when it exceeds its maximum.

This attributes counts the number of All Routes Explore or Spanning Tree Explore frames that were discarded because the last LAN ID in the routing information field did not equal the LAN ID. This counter will wrap to zero when it exceeds its maximum.

This attribute is indicative of the number of explorer frames discarded due to fact that the outbound SourceRouteBridge port was disabled or deleted. This counter will wrap to zero when it exceeds its maximum.

This attribute specifies the number of frames discarded due to receiving a frame with a target LAN ID which did not match the internal LAN ID of the receiving bridge port. This counter will wrap to zero when it exceeds its maximum.

This entry controls the addition and deletion of vrPpTbsg components.

A single entry in the table represents a single vrPpTbsg component.

This variable is used as the basis for SNMP naming of vrPpTbsg components. These components can be added and deleted.

This variable provides the component's string name for use with the ASCII Console Interface

This variable represents the storage type value for the vrPpTbsg tables.

This variable represents the index for the vrPpTbsg tables.

This group houses all the provisionable attributes that belong to the this group. This group of attributes is applicable to all types of bridge ports and represent the common factor between them. These attributes influence the working of a bridge port.

An entry in the vrPpTbsgProvTable.

This attribute specifies the type of translation to be performed on frames carrying IPX packets. Ethernet frames carrying IPX payload could be translated to IEEE 802.3 frames (with the same IPX payload) or vice- versa. The main reason to do so is to allow the bridge unit to consistently forward one type of frames carrying IPX packets. Translations can be turned off altogether in which case the IPX frames will pass through the bridge unit unchanged. Enumeration: 'snap': 3, 'ethernet': 2, 'sap': 4, 'off': 0, 'ieee8023': 1.

This attribute specifies if or not outbound frames carrying IP datagrams should be fragmented to conform to message transfer unit (mtu) sizes dictated by the media. Enumeration: 'on': 1, 'off': 0.

This attribute specifies if the frames should be ordered or not before they are transmitted through a bridge port. If this attribute has a value of ordered the received frames are ordered as in the original message, before they are transmitted out through a bridge port. If it has a value of notOrdered, received then frames pass through the bridge unit in the order they are received. This feature can be used over multiple telecommunication links to increase data flow. Please note that this attribute only affects link protocols and is ineffective with lan media. Enumeration: 'notOrdered': 1, 'ordered': 0.

This attribute is indicative of the state of the MAC address format conversion process for ARP/RARP frames. The MAC addresses may be translated if need be from a canonical format to a non-canonical format, based on the needs of the associated media. If this attribute is set to a value of on then all Mac addresses will converted if need be to suit the format of mac address, the outgoing media will support. If this attribute is set to a value of off no such conversion takes place. Enumeration: 'on': 1, 'off': 0.

This attribute is indicative of the unique number assigned to the bridge port. It is used for SNMP management of this bridge port and in spanning tree as an identifier this bridge port. Notes regarding portNum: Escape routines exist for initializing, copying, and deleting port numbers. This is necessary because SNMP requires a unique port instance identifier. The initPortNum escape routine sets the port number to a value in the range 1-255 for this purpose. The setCopiedPortNum escape routine exists to maintain the uniqueness of the port number in cases when one port is copied to another. When a bridge port is deleted, the releasePortNum escape routine places the port number being released into a pending deletion state. This is because the port number cannot be re-allocated until the port is truely deleted in the current view. This is necessary since there is no guarantee of order when processing changes to multiple protocol ports so without the pending deletion state, the same port number could be temporarily assigned to two ports for a short period of time. The portNum is set as component critical since bridging also uses the port number as a key for indexing into its data structures. If a port is deleted then re-added under the same protocol port, CAS treats the change as a SET to the portNum attribute.

This attribute specifies the media type the frame must be in before it is to be forwarded over the outbound supported WAN Bridge Protocol Port. The attribute only applies to outbound Bridge Protocol Port. For supported bridge ports, if the attribute value remains set to the default value of unaltered then there will be no frame conversion. When the value is set to the value ethernetConv then all frames being forwarded out the outbound WAN Port will be converted to ethernet before forwarding takes place. The only outbound WAN medias that currently support conversion are: FR (Frame Relay) and VNS. All other medias will fail the Bridge Port semantic check when attempts are made to alter this attribute. The following is an example of what the user may be able to do. Frames originating from a Token Ring are to be flooded out onto another Token Ring and a Frame Relay Port. The token ring Outbound port performs no translation, yet the FR Port has the outboundFrameMediaType attribute set to ethernetConv which results in the frame being translated into Ethernet format from Token Ring format before Frame Relay does its encapsulation and transmits over the FR port. Enumeration: 'unaltered': 1, 'ethernetConv': 2.

This group houses all the port specific provisionable attributes that belong to the Tb group. The Tb group is only applicable bridge port types that operate in the TB mode. These attributes in part influence the working of a bridge port operating in the TB mode.

An entry in the vrPpTbsgTbProvTable.

This attribute specifies whether the port secure feature is enabled. The secure feature, if enabled causes the following things to happen: a) disallows dynamic learning, b) disallows frames to be forwarded that do not satisfy the following condition: the mac address of the source should be found in the forwarding table and the destination mac address of the frame should also be found in the forwarding table. In addition to this, the port the frame was received on should figure as the in port, given the destination mac address found in the frame. c) disallows frames to be forwarded if the allowed to go port map for the destination mac address is empty. This feature in effect allows the user to choose the hosts that can generate traffic and the hosts that can receive traffic through this bridge unit. Enumeration: 'disabled': 0, 'enabled': 1.

This group houses all the port specific provisionable attributes that belong to the Stp group. The Stp group is applicable to all the bridge ports that participate in the spanning tree protocol. These attributes influence the participation of the bridge port in the spanning tree protocol.

An entry in the vrPpTbsgStpProvTable.

This attribute defines the current administrative state for this component. enabled indicates that the component is available for operation. disabled indicates the component is unavailable for operation. Enumeration: 'down': 2, 'up': 1.

This attribute specifies whether or not spanning tree protocol state for this bridge port is controlled by the spanning tree protocol. In essence it indicates the participation of this bridge port in the spanning tree protocol, by accepting and acting on received bridge protocol data units and by sending out the same. on signifies that this bridge port's spanning tree port state is controlled by the spanning tree protocol. A value of off signifies that the spanning tree port state of this bridge port is unaffected by the spanning tree protocol. This in effect puts the bridge port out of reach of the spanning tree protocol and in the forwarding state. Care should be taken while assigning a value of off to this attribute, as this might cause network loops. Please do not set this attribute to off unless you are absolutely sure about the effect of such an action on your network topology. Enumeration: 'on': 1, 'off': 0.

This attribute specifies the type of spanning tree protocol the port is participating in. A bridge port could participate in either the ieee8021 spanning tree protocol or the dec spanning tree protocol. If the value of the attribute protocolSpec in the SpanningTreeProtocol component, provisioned under the TransparentBridge component is in conflict with the value of this attribute, the value of the protocolSpec attribute will prevail. Prevailing stp type is reflected in the value of the attribute stpTypeOper. Enumeration: 'dec': 2, 'ieee8021': 3.

This attribute specifies the value for port priority, which is contained in the first octet of the port identifier. Valid values are as follows: 1) 0..255 for stp type DEC and 2) 0..65535 for stp type IEEE.

This attribute specifies the contribution of this port, to all the paths to the root bridge that include this port. Please note that the value of the attribute pathCostMethod is applied only when the value of the attribute pathCostMethod is set to on and is ignored if otherwise.

This attribute specifies the method used by the bridging logic, to calculate the path cost to the bridge considered to be the root bridge in the spanning tree topology. This attribute should be set to off before attempting to provision a value for pathCostProv. Enumeration: 'dec': 2, 'off': 1, 'ieee8021': 3.

This group houses all the provisionable, domain specific attributes for a non-encapsulating bridge port.

An entry in the vrPpTbsgDIProvTable.

This attribute specifies the domain number associated with this bridge port. Domain numbers are used for confining frames to a domain. Domain based filtering provides a complete segregation of traffic based on domain number associated with frames. There can exist only sixteen domains when a spanning tree is desired specific to each domain. When there is only a single spanning tree spanning all the domains the maximum number of domains possible are 4294967293. This attribute is of no relevance when associated with backbone bridge port. Its value is ignored in such a situation.

This attribute specifies if the domain information should be preserved or embedded in the frame header. This attribute applies only to backbone ports and does not affect the access bridge ports. By setting this attribute to a value of on, domain information could be preserved in frames being tunnelled across the a backbone, so that this information can be deciphered at the other end of the backbone tunnel. This preserves the integrity of the domains thus preventing domain breaches while tunnelling frames across backbone network. If the value of this attribute is set to off then domain information is not preserved in the header of the frames tunnelling through the backbone. This eliminates the overhead incurred to preserve domain information across the backbone while tunnelling frames across it. Preserve domain is relevant when used in conjunction with the following media: FDDI, ATM MPE, Frame Relay and PPP. It is ignored when used with other types of media. Enumeration: 'on': 1, 'off': 0.

This group contains the three OSI State attributes. The descriptions generically indicate what each state attribute implies about the component. Note that not all the values and state combinations described here are supported by every component which uses this group. For component-specific information and the valid state combinations, refer to NTP 241-7001-150, Passport Operations and Maintenance Guide.

An entry in the vrPpTbsgStateTable.

This attribute indicates the OSI Administrative State of the component. The value locked indicates that the component is administratively prohibited from providing services for its users. A Lock or Lock - force command has been previously issued for this component. When the value is locked, the value of usageState must be idle. The value shuttingDown indicates that the component is administratively permitted to provide service to its existing users only. A Lock command was issued against the component and it is in the process of shutting down. The value unlocked indicates that the component is administratively permitted to provide services for its users. To enter this state, issue an Unlock command to this component. Enumeration: 'locked': 0, 'shuttingDown': 2, 'unlocked': 1.

This attribute indicates the OSI Operational State of the component. The value enabled indicates that the component is available for operation. Note that if adminState is locked, it would still not be providing service. The value disabled indicates that the component is not available for operation. For example, something is wrong with the component itself, or with another component on which this one depends. If the value is disabled, the usageState must be idle. Enumeration: 'disabled': 0, 'enabled': 1.

This attribute indicates the OSI Usage State of the component. The value idle indicates that the component is not currently in use. The value active indicates that the component is in use and has spare capacity to provide for additional users. The value busy indicates that the component is in use and has no spare operating capacity for additional users at this time. Enumeration: 'active': 1, 'idle': 0, 'busy': 2.

This group includes the Operational Status attribute. This attribute defines the current operational state of this component.

An entry in the vrPpTbsgOperStatusTable.

The current state of the interface. The up state indicates the interface is operational and capable of forwarding packets. The down state indicates the interface is not operational, thus unable to forward packets. testing state indicates that no operational packets can be passed. Enumeration: 'down': 2, 'testing': 3, 'up': 1.

This group houses all the operational attributes belonging to the base group. The base group of attributes is applicable to all types of bridge ports and represent the common factor between them. These attributes in part, reflect the state of a bridge port.

An entry in the vrPpTbsgOperTable.

The attribute portName is a string of the form 'BridgePortName-i', where BridgePortName is the abbreviation of the corresponding bridge port and i is the instance identifier of the ProtocolPort, the bridge port is provisioned under. For example a TransparentBridgePort provisioned under ProtocolPort/myport would have a name TBP-myport.

This attribute specifies the accumulated up time of this bridge port since the last reset occurred.

This attribute specifies the accumulated down time of this bridge port since the last reset occurred.

This attribute specifies the mode of bridging this port can support. It in turn implies the format of frames, this bridge port can process and forward. Enumeration: 'unknown': 1, 'tb': 2, 'srt': 4, 'sr': 3.

This attribute specifies the bridge port's configuration. It indicates if the bridge port is operating as an access port or as a backbone port. An access bridge port does not encapsulate a MAC frame and does not preserve domain information in the encapsulation, whereas a backbone bridge port encapsulates the MAC frame and optionally preserves domain information in the encapsulated frame.A backbone bridge port is typically used to transport frames across a high bandwidth backbone network to another bridge unit for further processing/forwarding of the frame. Enumeration: 'access': 1, 'backbone': 2.

This attribute specifies the type of bridge port that was provisioned. It takes into consideration the bridgingMode, bridgePortConfig and the media the bridge port is linked to before branding a bridge port. Enumeration: 'fddiBridgePort': 2, 'ethernetBridgePort': 0, 'snaDlrBridgePort': 21, 'clusterTbBridgePort': 18, 'lanEmulationClientEthernet': 22, 'frameRelayBridgePort': 6, 'srtbBridgePort': 15, 'srEncapSrBridgePort': 11, 'tbsrBridgePort': 16, 'unknown': 19, 'vcpBridgePort': 9, 'clusterSrBridgePort': 17, 'srEncapTbBridgePort': 12, 'fddiEncapsulatingBridgePort': 4, 'sourceGateSrBridgePort': 13, 'sourceGateTbBridgePort': 14, 'x25BridgePort': 10, 'smdsBridgePort': 8, 'tokenRingBridgePort': 1, 'tokenBusBridgePort': 3, 'vnsBridgePort': 5, 'atmMpeBridgePort': 20, 'pppBridgePort': 7.

This attribute specifies the index into the Interface Table where in information about the media interface corresponding to the bridge port is maintained.

This attribute is indicative of the number of frames that were discarded because the time taken to process these frames exceeded the transit delay allowed for this bridge unit. This attribute is not supported by bridging and will always have a value of 0.

This attribute is indicative of the number of frames discarded because the size of the out bound frame exceeded the message transfer unit (mtu) allowed for the bridge port. Note that this counter only refers to the outbound frames for this bridge port. This counter wraps around its maximum value of 4294967295. This counter is influenced by the attribute fragmentIp. This counter is incremented when the a frame larger than the mtu allowed is encountered and cannot be fragmented. If this counter is increasing steadily, it might be useful to set the value of the attribute fragmentIp to a value of on.

This group houses all the port specific operational attributes that belong to the Tb group. This group also houses all the port specific statistical attributes that belong to the Tb group. The Tb group is only applicable bridge port types that operate in the TB mode. These attributes reflect the state of a bridge port operating in the TB mode

An entry in the vrPpTbsgTbOperTable.

This attribute specifies the maximum size of the information field in a TB frame. This excludes the header field.

This attribute is indicative of the number of incoming frames that were discarded because: a) the value of the secureOption attribute was set to on and b) it is not allowed to receive frames originating from the mac address found in the source address field of the frame (source mac address look up in the forwarding table failed.) on this bridge port. c) for the destination mac address found in the frame, the port the frame was received on does not appear as in port in the corresponding static table entry. Permission to receive frames from a mac address is granted via the static table entries. This attribute, badVerifyDiscards, is directly influenced by: 1. secureOption and 2. the static table entries. This counter wraps around its maximum value of 4294967295.

This attribute is indicative of the number frames discarded because the MAC address found in the destination field did not match the local MAC address of the bridge port. This counter is only applicable for the protocols that are being routed currently.This counter wraps around its maximum value of 4294967295.

This attribute is indicative of the number of frames that were discarded because of the following two reasons: a) there was no entry for the 'allowed to go' field in the static table entry, where the input port is this bridge port. b) for spanning tree bpdus that are locally processed. This counter wraps around its maximum value of 4294967295. It might prove useful to check the static table entry corresponding to the bridge port in question, if this counter consistently displays a high value. Ideally this counter should be as low as possible.