NORTEL-NETWORKS-MULTIPLE-SPANNING-TREE-MIB

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Organization: Nortel Networks

Last Updated: 2014-06-24

Category: Spanning Tree

Description: Manages Nortel proprietary Multiple Spanning Tree instances and per-VLAN port roles as a precursor to IEEE 802.1s.

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What Is NORTEL-NETWORKS-MULTIPLE-SPANNING-TREE-MIB?

This MIB is a Nortel Networks proprietary module implementing Multiple Spanning Tree (MST) management, an early Nortel-specific precursor to the IEEE 802.1s standard, allowing multiple spanning-tree instances to be mapped to different VLANs for load balancing and redundancy. It exposes configuration data such as the number of supported MST instances, maximum hop count, bridge address and priority, and per-instance root bridge/cost/port information for the Common and Internal Spanning Tree (CIST). Its monitoring value is on the software/protocol status of Layer 2 topology: administrators can confirm which bridge is acting as root, detect root-bridge changes indicating a topology recalculation, and verify bridge timer parameters (max age, forward delay) are configured correctly, revealing spanning-tree instability that could cause network loops or outages. It is explicitly designed as a Nortel precursor to the IEEE 802.1s Multiple Spanning Tree standard, so its object model closely parallels the eventual standard MIB. It is typically deployed on Nortel Networks Layer 2 switches operating VLANs that require per-instance spanning-tree load distribution, where a NORTEL-NETWORKS-MULTIPLE-SPANNING-TREE-MIB download helps administrators confirm root-bridge stability across those VLAN instances.

IPNetwork Monitor allows you to monitor SNMP objects defined in NORTEL-NETWORKS-MULTIPLE-SPANNING-TREE-MIB. Use the built-in SNMP Monitoring Browser to explore available variables, view their current values and descriptions, and select the objects you want to monitor. You can then create SNMP monitors, configure thresholds, and receive alerts when monitored values change.

Supported Devices

Nortel Networks Layer 2 switch

Monitoring Examples

An administrator would poll nnMstCistRoot and nnMstCistRegionalRoot to determine which bridge the switch currently believes is the CIST root, and a change in this value across polls would reveal a topology recalculation event, potentially due to a root bridge failure or a new switch with a lower priority joining the network. Polling nnMstCistRootCost and nnMstCistRootPort would show the cost and port path to that root, useful for validating the expected physical topology. nnMstNoOfInstancesSupported and nnMstMaxHopCount confirm the device's MST capacity and configured region boundary, while the nnMstNotifications group (under nnMstObjects/nnMstScalars) would alert on spanning-tree topology change events as they happen.

What Can Be Monitored

CIST root bridge identity
CIST root path cost and root port
bridge priority and address
bridge max age and forward delay timers
number of supported MST instances
spanning-tree topology change notifications

Imported Objects

From BRIDGE-MIB

BridgeId
Timeout

From Q-BRIDGE-MIB

VlanId

From SNMPv2-SMI

Counter32
Integer32
MODULE-IDENTITY
NOTIFICATION-TYPE
OBJECT-TYPE
TimeTicks

From SNMPv2-TC

MacAddress
RowStatus
TEXTUAL-CONVENTION
TruthValue

From SYNOPTICS-ROOT-MIB

bayStackMibs

OBJECT-IDENTITY

How to Use in IPNetwork Monitor

Example using nnMstMstpUpCount OID:

Select a Nortel Networks Layer 2 switch (Multiple Spanning Tree) as the target host to create a monitor — the SNMP service should be up and running on it. Click New Monitor, then check SNMP Custom on the Favorites tab, click Next, and confirm the host. On the next page, click Select... to open the built-in SNMP MIB Browser and type nnMstMstpUpCount into the Find box to locate it in the OID tree, then select it and click OK. The number of times MSTP Module has been enabled. On the monitor's Main parameters page you can set the target's SNMP port (default 161), credentials, polling interval, and other settings — see the SNMP Monitor help for details. On the State conditions and Alerting tabs, configure when the monitor should change state and trigger an alert; since this is a Counter32-type OID, Value bounds is the most useful condition here — trigger an alert if the counter increases sharply between polls relative to its normal baseline, since an unexpected spike often reflects a real change in traffic or activity. Click Finish to create the monitor; you can adjust any parameter later.

OIDs

OID symbolic	OID numeric	Type	Access	Description
nnMultipleSpanningTreeMib	1.3.6.1.4.1.45.5.5			Nortel Networks Multiple Spanning-Tree MIB Copyright 2003 Nortel Networks, Inc. All rights reserved. This Nortel Networks SNMP Management Information Base Specification embodies Nortel Networks' confidential and proprietary intellectual property. Nortel Networks retains all title and ownership in the Specification, including any revisions. This Specification is supplied 'AS IS,' and Nortel Networks makes no warranty, either express or implied, as to the use, operation, condition, or performance of the Specification.
nnMstNotifications	1.3.6.1.4.1.45.5.5.0
NTF nnMstGeneralEvent	1.3.6.1.4.1.45.5.5.0.1			Generated when any of the general events like protocol up or protocol down occurs
NTF nnMstErrorEvent	1.3.6.1.4.1.45.5.5.0.2			Generated when any of the error events like memory failure or buffer failure or protocol migration or new root or topology change occurs
NTF nnMstNewRoot	1.3.6.1.4.1.45.5.5.0.3			Generated whenever a new root bridge is selected in the topology
NTF nnMstTopologyChange	1.3.6.1.4.1.45.5.5.0.4			Generated when topology change is detected
NTF nnMstProtocolMigration	1.3.6.1.4.1.45.5.5.0.5			Generated when port protocol migration happens in the port
NTF nnMstRegionConfigChange	1.3.6.1.4.1.45.5.5.0.6			Generated when the MST region's configuration identifier changes.
nnMstObjects	1.3.6.1.4.1.45.5.5.1
nnMstScalars	1.3.6.1.4.1.45.5.5.1.1
I32 nnMstNoOfInstancesSupported	1.3.6.1.4.1.45.5.5.1.1.1	Integer32	read-only	Indicates Maximum number of spanning tree Instances supported.
I32 nnMstMaxHopCount	1.3.6.1.4.1.45.5.5.1.1.2	Integer32	read-write	Indicates the Maximum Hop Count value. The granularity of this timer is specified to be 1 second. An agent may return a badValue error if a set is attempted to a value which is not a whole number of seconds.
MAC nnMstBrgAddress	1.3.6.1.4.1.45.5.5.1.1.3	MacAddress	read-only	The MAC address used by this bridge when it must be referred to in a unique fashion. It is recommended that this be the numerically smallest MAC address of all ports that belong to this bridge. However it is only required to be unique. When concatenated with nnMstCistBridgePriority or nnMstBridgePriority a unique BridgeIdentifier is formed which is used in the Spanning Tree Protocol.
BRI nnMstCistRoot	1.3.6.1.4.1.45.5.5.1.1.4	BridgeId	read-only	The bridge identifier of the Root of the common spanning tree as determined by the Spanning Tree Protocol as executed by this node. This value is used as the CIST Root Identifier parameter in all Configuration Bridge PDUs originated by this node.
BRI nnMstCistRegionalRoot	1.3.6.1.4.1.45.5.5.1.1.5	BridgeId	read-only	The bridge identifier of the Root of the Multiple spanning tree region as determined by the Spanning Tree Protocol as executed by this node. This value is used as the CIST Regional Root Identifier parameter in all Configuration Bridge PDUs originated by this node.
I32 nnMstCistRootCost	1.3.6.1.4.1.45.5.5.1.1.6	Integer32	read-only	The Cost of the path to the CIST Root as seen from this bridge.
I32 nnMstCistRegionalRootCost	1.3.6.1.4.1.45.5.5.1.1.7	Integer32	read-only	The Cost of the path to the CIST Regional Root as seen from this bridge.
I32 nnMstCistRootPort	1.3.6.1.4.1.45.5.5.1.1.8	Integer32	read-only	The Port Number of the Port which offers the lowest path cost from this bridge to the CIST Root Bridge.
I32 nnMstCistBridgePriority	1.3.6.1.4.1.45.5.5.1.1.9	Integer32	read-write	The Value of the writable portion of the Bridge Identifier comprising of the first two octets. The values that are set for Bridge Priority must be in steps of 4096.
TIM nnMstCistBridgeMaxAge	1.3.6.1.4.1.45.5.5.1.1.10	Timeout	read-write	The value that all bridges use for MaxAge when this bridge is acting as the root. The granularity of this timer is specified to be 1 second. An agent may return a badValue error if a set is attempted to a value which is not a whole number of seconds.
TIM nnMstCistBridgeForwardDelay	1.3.6.1.4.1.45.5.5.1.1.11	Timeout	read-write	The value that all bridges use for ForwardDelay when this bridge is acting as the root. Note that 802.1D specifies that the range for this parameter is related to the value of BridgeMaxAge. The granularity of this timer is specified to be 1 second. An agent may return a badValue error if a set is attempted to a value which is not a whole number of seconds.
I32 nnMstCistHoldTime	1.3.6.1.4.1.45.5.5.1.1.12	Integer32	read-only	This time value determines the interval length during which no more than two Configuration bridge PDUs shall be transmitted by this node, in units of hundredths of a second.
TIM nnMstCistMaxAge	1.3.6.1.4.1.45.5.5.1.1.13	Timeout	read-only	The maximum age of Spanning Tree Protocol information learned from the network on any port before it is discarded, in units of hundredths of a second. This is the actual value that this bridge is currently using.
TIM nnMstCistForwardDelay	1.3.6.1.4.1.45.5.5.1.1.14	Timeout	read-only	This time value, measured in units of hundredths of a second, controls how fast a port changes its spanning state when moving towards the Forwarding state. The value determines how long the port stays in a particular state before moving to the next state.
C32 nnMstMstpUpCountEx	1.3.6.1.4.1.45.5.5.1.1.15	Counter32	read-only	The number of times MSTP Module has been enabled. A Trap is generated on the occurence of this event.
C32 nnMstMstpDownCount	1.3.6.1.4.1.45.5.5.1.1.16	Counter32	read-only	The number of times MSTP Module has been disabled. A Trap is generated on the occurence of this event.
INT nnMstPathCostDefaultType	1.3.6.1.4.1.45.5.5.1.1.17	INTEGER	read-write	The version of the Spanning Tree default Path Costs that are to be used by this Bridge. A value of 8021d1998(1) uses the 16-bit default Path Costs from IEEE Std. 802.1D-1998. A value of stp8021t2001(2) uses the 32-bit default Path Costs from IEEE Std. 802.1t.
INT nnMstForceProtocolVersion	1.3.6.1.4.1.45.5.5.1.1.18	INTEGER	read-write	The version of Spanning Tree Protocol the bridge is currently running. The value 'stpCompatible(0)' indicates the Spanning Tree Protocol specified in IEEE 802.1D and 'rstp(2)' indicates the Rapid Spanning Tree Protocol specified in IEEE 802.1w and 'mstp(3)' indicates the Multiple Spanning Tree Protocol Specified in IEEE 802.1s.
INT nnMstTxHoldCount	1.3.6.1.4.1.45.5.5.1.1.19	INTEGER	read-write	The value used by the Port Transmit state machine to limit the maximum transmission rate.
I32 nnMstConfigIdSel	1.3.6.1.4.1.45.5.5.1.1.20	Integer32	read-write	The Configuration Identifier Format Selector used by the Bridge. This has a fixed value of 0 to indicate RegionName, RegionVersion are specified as in Standard.
OCT nnMstRegionName	1.3.6.1.4.1.45.5.5.1.1.21	OCTET STRING	read-write	The Name for the Region's configuration. By Default Region Name will be equal to the Bridge Mac Address.
I32 nnMstRegionVersion	1.3.6.1.4.1.45.5.5.1.1.22	Integer32	read-write	Version of the MST Region.
OCT nnMstConfigDigest	1.3.6.1.4.1.45.5.5.1.1.23	OCTET STRING	read-only	The Configuration Digest value for this Region, this is an MD5 digest value, and hence must always be 16 octets long.
C32 nnMstRegionConfigChangeCount	1.3.6.1.4.1.45.5.5.1.1.24	Counter32	read-only	The number of times a Region Configuration Identifier Change was detected. A Trap is generated on the occurence of this event.
INT nnMstCistBridgeRoleSelectionSemState	1.3.6.1.4.1.45.5.5.1.1.25	INTEGER	read-only	Current state of the Port Role Selection State Machine of this bridge in Common Spanning Tree context
TIK nnMstCistTimeSinceTopologyChange	1.3.6.1.4.1.45.5.5.1.1.26	TimeTicks	read-only	The time (in hundredths of a second) since the TcWhile Timer for any port in this Bridge was non-zero for Common Spanning Tree context.
C32 nnMstCistTopChanges	1.3.6.1.4.1.45.5.5.1.1.27	Counter32	read-only	The number of times that there have been atleast one non-zero TcWhile Timer on this Bridge for Common Spanning Tree context.
C32 nnMstCistNewRootBridgeCount	1.3.6.1.4.1.45.5.5.1.1.28	Counter32	read-only	The number of times this Bridge has detected a Root Bridge change for Common Spanning Tree context. A Trap is generated on the occurence of this event.
nnMstBridgeTable	1.3.6.1.4.1.45.5.5.1.2		not-accessible	Table containing Bridge Information specific to Spanning Tree Instance.
nnMstBridgeEntry	1.3.6.1.4.1.45.5.5.1.2.1		not-accessible	Entry indicating the Bridge Information.
I32 nnMstBridgeInstance	1.3.6.1.4.1.45.5.5.1.2.1.1	Integer32	not-accessible	Spanning Tree Instance to which the information belongs.
BRI nnMstBridgeRegionalRoot	1.3.6.1.4.1.45.5.5.1.2.1.2	BridgeId	read-only	MSTI Regional Root Identifier value for the Instance. This value is used as the MSTI Regional Root Identifier parameter in all Configuration Bridge PDUs originated by this node
I32 nnMstBridgePriority	1.3.6.1.4.1.45.5.5.1.2.1.3	Integer32	read-create	The writable portion of the MSTI Bridge Identifier. comprising of the first two octets. The values that are set for Bridge Priority must be in steps of 4096.
I32 nnMstBridgeRootCost	1.3.6.1.4.1.45.5.5.1.2.1.4	Integer32	read-only	The Cost of the path to the MSTI Regional Root as seen by this bridge.
I32 nnMstBridgeRootPort	1.3.6.1.4.1.45.5.5.1.2.1.5	Integer32	read-only	The Port Number of the Port which offers the lowest path cost from this bridge to the MSTI Region Root Bridge.
TIK nnMstBridgeTimeSinceTopologyChange	1.3.6.1.4.1.45.5.5.1.2.1.6	TimeTicks	read-only	The time (in hundredths of a second) since the TcWhile Timer for any port in this Bridge was non-zero for this spanning tree instance.
C32 nnMstBridgeTopChanges	1.3.6.1.4.1.45.5.5.1.2.1.7	Counter32	read-only	The number of times that there have been atleast one non-zero TcWhile Timer on this Bridge for this spanning tree instance.
C32 nnMstBridgeNewRootCount	1.3.6.1.4.1.45.5.5.1.2.1.8	Counter32	read-only	The number of times this Bridge has detected a Root Bridge change for this spanning tree instance. A Trap is generated on the occurence of this event.
INT nnMstBridgeRoleSelectionSemState	1.3.6.1.4.1.45.5.5.1.2.1.9	INTEGER	read-only	Current state of the Port Role Selection State Machine for this spanning tree instance for this bridge.
C32 nnMstBridgeInstanceUpCount	1.3.6.1.4.1.45.5.5.1.2.1.10	Counter32	read-only	The number of times a new spanning tree instance has been created. A Trap is generated on the occurence of this event.
C32 nnMstBridgeInstanceDownCount	1.3.6.1.4.1.45.5.5.1.2.1.11	Counter32	read-only	The number of times a spanning tree instance has been deleted. A Trap is generated on the occurence of this event.
BRI nnMstBridgeOldDesignatedRoot	1.3.6.1.4.1.45.5.5.1.2.1.12	BridgeId	read-only	The bridge identifier of the old root of the spanning tree instance as determined by the Spanning Tree Protocol as executed by this node.
T/F nnMstBridgeEnabled	1.3.6.1.4.1.45.5.5.1.2.1.13	TruthValue	read-create	This object is used to control whether this bridge instance is enabled or disabled.
ROW nnMstBridgeRowStatus	1.3.6.1.4.1.45.5.5.1.2.1.14	RowStatus	read-create	This object is used to control row creation/deletion.
nnMstCistPortTable	1.3.6.1.4.1.45.5.5.1.3		not-accessible	This table contains Common Spanning Tree Port Information.
nnMstCistPortEntry	1.3.6.1.4.1.45.5.5.1.3.1		not-accessible	A list of information maintained by every port for Common Spanning tree.
I32 nnMstCistPort	1.3.6.1.4.1.45.5.5.1.3.1.1	Integer32	not-accessible	The Port number of the port for which this entry contains spanning tree information.
I32 nnMstCistPortPathCost	1.3.6.1.4.1.45.5.5.1.3.1.2	Integer32	read-write	The contribution of this port to the path cost of paths towards the CIST Root which include this port.
I32 nnMstCistPortPriority	1.3.6.1.4.1.45.5.5.1.3.1.3	Integer32	read-write	The four most significant bits of the Port Identifier of the Spanning Tree instance can be modified by setting the CistPortPriority value. The values that are set for Port Priority must be in steps of 16.
BRI nnMstCistPortDesignatedRoot	1.3.6.1.4.1.45.5.5.1.3.1.4	BridgeId	read-only	The unique Bridge Identifier of the bridge recorded as the CIST Root in the configuration BPDUs transmitted.
BRI nnMstCistPortDesignatedBridge	1.3.6.1.4.1.45.5.5.1.3.1.5	BridgeId	read-only	The unique Bridge Identifier of the bridge which this port considers to be the Designated Bridge for the port's segment.
OCT nnMstCistPortDesignatedPort	1.3.6.1.4.1.45.5.5.1.3.1.6	OCTET STRING	read-only	The Port identifier of the port on the Designated Bridge for this port's segment.
INT nnMstCistPortAdminP2P	1.3.6.1.4.1.45.5.5.1.3.1.7	INTEGER	read-write	The administrative point-to-point status of the LAN segment attached to this port. A value of forceTrue(0) indicates that this port should always be treated as if it is connected to a point-to-point link. A value of forceFalse(1) indicates that this port should be treated as having a shared media connection. A value of auto(2) indicates that this port is considered to have a point-to-point link if it is an Aggregator and all of its members are aggregatable, or if the MAC entity is configured for full duplex operation, either through auto-negotiation or by management means.
T/F nnMstCistPortOperP2P	1.3.6.1.4.1.45.5.5.1.3.1.8	TruthValue	read-only	The operational point-to-point status of the LAN segment attached to this port. It indicates whether a port is considered to have a point-to-point connection or not. The value is determined by management or by auto-detection, as described in the nnMstCistPortAdminP2P object.
T/F nnMstCistPortAdminEdgeStatus	1.3.6.1.4.1.45.5.5.1.3.1.9	TruthValue	read-write	The administrative value of the Edge Port parameter. A value of TRUE(1) indicates that this port should be assumed as an edge-port and a value of FALSE(2) indicates that this port should be assumed as a non-edge-port.
T/F nnMstCistPortOperEdgeStatus	1.3.6.1.4.1.45.5.5.1.3.1.10	TruthValue	read-only	The operational value of the Edge Port parameter. The object is initialized to the value of nnMstCistPortAdminEdgeStatus and is set FALSE on reception of a BPDU.
T/F nnMstCistPortProtocolMigration	1.3.6.1.4.1.45.5.5.1.3.1.11	TruthValue	read-write	Indicates the Protocol migration state of this Port. When operating in RSTP/MSTP (version >= 2) mode, writing TRUE(1) to this object forces this port to transmit MSTP BPDUs without instance information. Any other operation on this object has no effect and it always returns FALSE(2) when read.
INT nnMstCistPortState	1.3.6.1.4.1.45.5.5.1.3.1.12	INTEGER	read-only	Current state of the Port as defined by the Common spanning tree protocol.
INT nnMstCistForcePortState	1.3.6.1.4.1.45.5.5.1.3.1.13	INTEGER	read-write	Current state of the Port which can be changed to either Disabled or Enabled for the base spanning tree instance.
C32 nnMstCistPortForwardTransitions	1.3.6.1.4.1.45.5.5.1.3.1.14	Counter32	read-only	Number of times this port has transitioned to the Forwarding State.
C32 nnMstCistPortRxMstBpduCount	1.3.6.1.4.1.45.5.5.1.3.1.15	Counter32	read-only	Number of MST BPDUs received on this port.
C32 nnMstCistPortRxRstBpduCount	1.3.6.1.4.1.45.5.5.1.3.1.16	Counter32	read-only	Number of RST BPDUs received on this port.
C32 nnMstCistPortRxConfigBpduCount	1.3.6.1.4.1.45.5.5.1.3.1.17	Counter32	read-only	Number of Configuration BPDUs received on this port.
C32 nnMstCistPortRxTcnBpduCount	1.3.6.1.4.1.45.5.5.1.3.1.18	Counter32	read-only	Number of TCN BPDUs received on this port.
C32 nnMstCistPortTxMstBpduCount	1.3.6.1.4.1.45.5.5.1.3.1.19	Counter32	read-only	Number of MST BPDUs Transmitted from this port.
C32 nnMstCistPortTxRstBpduCount	1.3.6.1.4.1.45.5.5.1.3.1.20	Counter32	read-only	Number of RST BPDUs Transmitted from this port.
C32 nnMstCistPortTxConfigBpduCount	1.3.6.1.4.1.45.5.5.1.3.1.21	Counter32	read-only	Number of Configuration BPDUs Transmitted from this port.
C32 nnMstCistPortTxTcnBpduCount	1.3.6.1.4.1.45.5.5.1.3.1.22	Counter32	read-only	Number of TCN BPDUs Transmitted from this port.
C32 nnMstCistPortInvalidMstBpduRxCount	1.3.6.1.4.1.45.5.5.1.3.1.23	Counter32	read-only	Number of Invalid MST BPDUs Received on this port.
C32 nnMstCistPortInvalidRstBpduRxCount	1.3.6.1.4.1.45.5.5.1.3.1.24	Counter32	read-only	Number of Invalid RST BPDUs Received on this port.
C32 nnMstCistPortInvalidConfigBpduRxCount	1.3.6.1.4.1.45.5.5.1.3.1.25	Counter32	read-only	Number of Invalid Configuration BPDUs Received on this port.
C32 nnMstCistPortInvalidTcnBpduRxCount	1.3.6.1.4.1.45.5.5.1.3.1.26	Counter32	read-only	Number of Invalid TCN BPDUs Received on this port.
INT nnMstCistPortTransmitSemState	1.3.6.1.4.1.45.5.5.1.3.1.27	INTEGER	read-only	Indicates current State of the Port Transmit state machine.
INT nnMstCistPortReceiveSemState	1.3.6.1.4.1.45.5.5.1.3.1.28	INTEGER	read-only	Indicates current State of the Port Receive state machine.
INT nnMstCistPortProtMigrationSemState	1.3.6.1.4.1.45.5.5.1.3.1.29	INTEGER	read-only	Indicates current State of the Port Protocol Migration State machine.
C32 nnMstCistProtocolMigrationCount	1.3.6.1.4.1.45.5.5.1.3.1.30	Counter32	read-only	The number of times this Port has migrated from one STP protocol version to another. The relevant protocols are STP-COMPATIBLE and RSTP/MSTP. A Trap is generated on the occurence of this event.
I32 nnMstCistPortDesignatedCost	1.3.6.1.4.1.45.5.5.1.3.1.31	Integer32	read-only	The path cost of the Designated Port of the segment connected to this port.
BRI nnMstCistPortRegionalRoot	1.3.6.1.4.1.45.5.5.1.3.1.32	BridgeId	read-only	The unique Bridge Identifier of the bridge recorded as the CIST Regional Root Identifier in the configuration BPDUs transmitted.
I32 nnMstCistPortRegionalPathCost	1.3.6.1.4.1.45.5.5.1.3.1.33	Integer32	read-only	The contribution of this port to the path cost of paths towards the CIST Regional Root which include this port.
INT nnMstCistSelectedPortRole	1.3.6.1.4.1.45.5.5.1.3.1.34	INTEGER	read-only	Selected Port Role of the port for this spanning tree instance.
INT nnMstCistCurrentPortRole	1.3.6.1.4.1.45.5.5.1.3.1.35	INTEGER	read-only	Current Port Role of the port for this spanning tree instance.
INT nnMstCistPortInfoSemState	1.3.6.1.4.1.45.5.5.1.3.1.36	INTEGER	read-only	Current state of the Port Information State Machine for this port in this spanning tree context.
INT nnMstCistPortRoleTransitionSemState	1.3.6.1.4.1.45.5.5.1.3.1.37	INTEGER	read-only	Current state of the Port Role Transition State Machine for this port in this spanning tree context.
INT nnMstCistPortStateTransitionSemState	1.3.6.1.4.1.45.5.5.1.3.1.38	INTEGER	read-only	Current state of the Port State Transition State Machine for this port in this spanning tree context.
INT nnMstCistPortTopologyChangeSemState	1.3.6.1.4.1.45.5.5.1.3.1.39	INTEGER	read-only	Current state of the Topology Change State Machine for this port in this spanning tree context.
TIM nnMstCistPortHelloTime	1.3.6.1.4.1.45.5.5.1.3.1.40	Timeout	read-write	The amount of time between the transmission of Configuration bridge PDUs by this node on this port in units of hundredths of a second.
INT nnMstCistPortOperVersion	1.3.6.1.4.1.45.5.5.1.3.1.41	INTEGER	read-only	This indicates whether the Port is operationally in the Mstp mode, Rstp mode or the Stp-compatible mode i.e., whether the Port is transmitting MST BPDUs, RST BPDUs or Config/TCN BPDUs.
T/F nnMstCistPortEffectivePortState	1.3.6.1.4.1.45.5.5.1.3.1.42	TruthValue	read-only	The effective operational state of the port for CIST. This will TRUE only when the port is operationally up in the Interface level and Protocol level for CIST. This is will be set to False for all other times.
nnMstPortTable	1.3.6.1.4.1.45.5.5.1.4		not-accessible	This table contains Spanning Tree Instance Specific Port Information.
nnMstPortEntry	1.3.6.1.4.1.45.5.5.1.4.1		not-accessible	A list of information maintained by every port for each and every spanning tree instance.
I32 nnMstPort	1.3.6.1.4.1.45.5.5.1.4.1.1	Integer32	not-accessible	The Port number of the port for which this entry contains spanning tree information.
I32 nnMstPortPathCost	1.3.6.1.4.1.45.5.5.1.4.1.2	Integer32	read-write	The contribution of this port to the path cost of paths towards the MSTI Root which include this port.
I32 nnMstPortPriority	1.3.6.1.4.1.45.5.5.1.4.1.3	Integer32	read-write	The four most significant bits of the Port Identifier for a given Spanning Tree instance can be modified independently for each Spanning Tree instance supported by the Bridge. The values that are set for Port Priority must be in steps of 16.
BRI nnMstPortDesignatedRoot	1.3.6.1.4.1.45.5.5.1.4.1.4	BridgeId	read-only	The unique Bridge Identifier of the bridge recorded as the MSTI Regional Root in the configuration BPDUs transmitted.
BRI nnMstPortDesignatedBridge	1.3.6.1.4.1.45.5.5.1.4.1.5	BridgeId	read-only	The unique Bridge Identifier of the bridge which this port considers to be the Designated Bridge for the port's segment.
OCT nnMstPortDesignatedPort	1.3.6.1.4.1.45.5.5.1.4.1.6	OCTET STRING	read-only	The Port identifier of the port on the Designated Bridge for this port's segment.
INT nnMstPortState	1.3.6.1.4.1.45.5.5.1.4.1.7	INTEGER	read-only	Current state of the Port as defined by the Multiple spanning tree protocol. Port which is Forwarding state in one instance can be in Discarding (Blocking) state in another instance.
INT nnMstPortForcePortState	1.3.6.1.4.1.45.5.5.1.4.1.8	INTEGER	read-write	Current state of the Port which can be changed to either Disabled or Enabled for the specific spanning tree instance.
C32 nnMstPortForwardTransitions	1.3.6.1.4.1.45.5.5.1.4.1.9	Counter32	read-only	Number of times this port has transitioned to the Forwarding State for specific instance.
C32 nnMstPortReceivedBPDUs	1.3.6.1.4.1.45.5.5.1.4.1.10	Counter32	read-only	Number of BPDUs received by this port for this spanning tree instance.
C32 nnMstPortTransmittedBPDUs	1.3.6.1.4.1.45.5.5.1.4.1.11	Counter32	read-only	Number of BPDUs transmitted on this port for this spanning tree instance.
C32 nnMstPortInvalidBPDUsRcvd	1.3.6.1.4.1.45.5.5.1.4.1.12	Counter32	read-only	Number of Invalid BPDUs received on this Port for this spanning tree instance.
I32 nnMstPortDesignatedCost	1.3.6.1.4.1.45.5.5.1.4.1.13	Integer32	read-only	The path cost of the Designated Port of the segment connected to this port.
INT nnMstPortSelectedPortRole	1.3.6.1.4.1.45.5.5.1.4.1.14	INTEGER	read-only	Selected Port Role of the port for this spanning tree instance.
INT nnMstPortCurrentPortRole	1.3.6.1.4.1.45.5.5.1.4.1.15	INTEGER	read-only	Current Port Role of the port for this spanning tree instance.
INT nnMstPortInfoSemState	1.3.6.1.4.1.45.5.5.1.4.1.16	INTEGER	read-only	Current state of the Port Information State Machine for this port in this spanning tree context.
INT nnMstPortRoleTransitionSemState	1.3.6.1.4.1.45.5.5.1.4.1.17	INTEGER	read-only	Current state of the Port Role Transition State Machine for this port in this spanning tree context.
INT nnMstPortStateTransitionSemState	1.3.6.1.4.1.45.5.5.1.4.1.18	INTEGER	read-only	Current state of the Port State Transition State Machine for this port in this spanning tree context.
INT nnMstPortTopologyChangeSemState	1.3.6.1.4.1.45.5.5.1.4.1.19	INTEGER	read-only	Current state of the Topology Change State Machine for this port in this spanning tree context.
T/F nnMstPortEffectivePortState	1.3.6.1.4.1.45.5.5.1.4.1.20	TruthValue	read-only	The effective operational stae of the port for specific instance. This is will be TRUE only when the port is operationally up in the interface level and Protocol level for the specific instance. This is will be set to false at all other times.
nnMstNotificationControl	1.3.6.1.4.1.45.5.5.1.5
nnMstNotificationControlScalars	1.3.6.1.4.1.45.5.5.1.5.1
I32 nnMstSetNotifications	1.3.6.1.4.1.45.5.5.1.5.1.1	Integer32	read-write	This object is used to enable and disable specific MSTP traps. Currently the following are defined 0 - Notifications are not enabled. 1 - General Notifications like protocol up or down 2 - Exception Notifications like memory failure or buffer failure or port protocol migration or invalid packet rcvd in port 3 - All the above Notifications
INT nnMstGenNotificationType	1.3.6.1.4.1.45.5.5.1.5.1.2	INTEGER	read-only	The general events like none - none of the below values up - protocol UP, down - protocol DOWN instanceUp - MSTP instance enabled instanceDown - MSTP instance disabled
INT nnMstErrNotificationType	1.3.6.1.4.1.45.5.5.1.5.1.3	INTEGER	read-only	The error event like none - none of the below values memfail - memory allocation failure bufffail - buffer allocation failure
nnMstPortNotificationTable	1.3.6.1.4.1.45.5.5.1.5.2		not-accessible	This table is used to store the notification information occured in each of the port for protocol migration and invalid packet received
nnMstPortNotificationEntry	1.3.6.1.4.1.45.5.5.1.5.2.1		not-accessible	This entry is used to store the notification information
I32 nnMstPortNotificationIndex	1.3.6.1.4.1.45.5.5.1.5.2.1.1	Integer32	not-accessible	A unique value, greater than zero, indicating the Port number.
INT nnMstPortNotificationMigrationType	1.3.6.1.4.1.45.5.5.1.5.2.1.2	INTEGER	read-only	Port Protocol migration type occured in the port
INT nnMstPortNotificationPktErrType	1.3.6.1.4.1.45.5.5.1.5.2.1.3	INTEGER	read-only	Type of invalid packet received in each of the port
I32 nnMstPortNotificationPktErrVal	1.3.6.1.4.1.45.5.5.1.5.2.1.4	Integer32	read-only	Packet error value corresponding to the above type
nnMstBridgeVlanMapTable	1.3.6.1.4.1.45.5.5.1.6		not-accessible	Table containing Mapped VlanList specific to Spanning Tree Instance.
nnMstBridgeVlanMapEntry	1.3.6.1.4.1.45.5.5.1.6.1		not-accessible	Entry indicating the Bridge VlanMap Information.
I32 nnMstBridgeInstId	1.3.6.1.4.1.45.5.5.1.6.1.1	Integer32	not-accessible	Spanning Tree Instance to which the information belongs.
OCT nnMstBridgeVlanMap	1.3.6.1.4.1.45.5.5.1.6.1.2	OCTET STRING	read-write	This gives the bitwise representation for the Vlans Mapped for a particular instance. 512*8 bits used to represent 4096 vlans. The 0th bit represents vlan 1, 1st bit represents vlan 2 and so forth. If vlan n is mapped to a particular instance then the n-1 indexed bit is set

RFC description

Manages multiple spanning tree instances and bridge VLAN mappings on Nortel switches.

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