MSTP-MIB

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Last Updated: 2000-07-15

Category: STP/RSTP

Description: Manages Multiple Spanning Tree Protocol instance configuration and port state.

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What Is MSTP-MIB?

MSTP-MIB is a MIB module for managing Multiple Spanning Tree Protocol (MSTP, IEEE 802.1s) instances, which allow multiple spanning-tree instances to be mapped onto VLANs for loop-free Layer 2 topologies. It exposes configuration and status data for each MST instance and its per-port state, including port role, forwarding/blocking state, and bridge priority/region parameters. Its monitoring focus is network topology and port operational status: administrators track port state transitions (blocking, learning, forwarding) and instance-to-VLAN mapping to detect spanning-tree topology changes, loops, or misconfigured regions rather than physical hardware sensors. It commonly builds on the base bridge MIB (BRIDGE-MIB) and IEEE 802.1 spanning-tree conventions, since MSTP is an extension of classic STP/RSTP bridging. It is deployed on enterprise and data-center Ethernet switches running MSTP for VLAN-aware loop prevention, and this MSTP-MIB reference documents the objects available for tracking that state.

IPNetwork Monitor allows you to monitor SNMP objects defined in MSTP-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

Enterprise/data-center Ethernet switch

Monitoring Examples

An operator polling the per-instance port table would check a port's spanning-tree state and role for a given MST instance, revealing whether a port is unexpectedly stuck in blocking state, which would indicate a topology change or misconfigured region boundary. Comparing instance-to-VLAN mappings across switches helps confirm consistent MSTP region configuration network-wide, catching a switch that fell out of sync after a topology change.

What Can Be Monitored

MST instance port state (forwarding/blocking/learning)
port role per instance
MST region/bridge priority configuration
instance-to-VLAN mapping
topology change count

Imported Objects

From DLINK-ID-REC-MIB

dlink-common-mgmt

From RFC1155-SMI

Counter

From SNMPv2-CONF

MODULE-COMPLIANCE
NOTIFICATION-GROUP
OBJECT-GROUP

From SNMPv2-SMI

MODULE-IDENTITY
OBJECT-TYPE
TimeTicks
Unsigned32

From SNMPv2-TC

DisplayString
RowStatus
TruthValue

OIDs

OID symbolic	OID numeric	Type	Access	Description
swMSTPCtrl	1.3.6.1.4.1.171.12.15.2
swMSTPGblMgmt	1.3.6.1.4.1.171.12.15.1
swMSTPInstanceCtrlEntry	1.3.6.1.4.1.171.12.15.2.3.1		not-accessible	.
swMSTPInstanceCtrlTable	1.3.6.1.4.1.171.12.15.2.3		not-accessible	A table that contains MSTP instance information.
BRI swMSTPInstDesignatedBridge	1.3.6.1.4.1.171.12.15.2.3.1.17	BridgeId	read-only	The Bridge Identifier for the transmitting bridge for this CIST or MSTI
BRI swMSTPInstDesignatedRootBridge	1.3.6.1.4.1.171.12.15.2.3.1.13	BridgeId	read-only	The bridge identifier of the CIST. For MST instance, this object is unused.
INT swMSTPInstExternalRootCost	1.3.6.1.4.1.171.12.15.2.3.1.14	INTEGER	read-only	The path cost between MST Regions from the transmitting Bridge to the CIST Root. For MST instance this object is unused.
INT swMSTPInstForwardDelay	1.3.6.1.4.1.171.12.15.2.3.1.20	INTEGER	read-only	This value, controls how fast a port changes its spanning state when moving towards the Forwarding state. The value determines how long the port stays in each of the Listening and Learning states, which precede the Forwarding state. This value is also used, when a topology change has been detected and is underway, to age all dynamic entries in the Forwarding Database.
INT swMSTPInstId	1.3.6.1.4.1.171.12.15.2.3.1.1	INTEGER	read-only	This object indicates the specific instance. An MSTP Instance Id(MSTID) of zero is used to identify the CIST.
INT swMSTPInstInternalRootCost	1.3.6.1.4.1.171.12.15.2.3.1.16	INTEGER	read-only	For CIST, the internal path cost is the path cost to the CIST Regional Root; For MSTI, the internal path cost is the path cost to the MSTI Regional Root for this particular MSTI in this MST Region
TIK swMSTPInstLastTopologyChange	1.3.6.1.4.1.171.12.15.2.3.1.21	TimeTicks	read-only	The time (in hundredths of a second) since the last time a topology change was detected by the bridge entity.
INT swMSTPInstMaxAge	1.3.6.1.4.1.171.12.15.2.3.1.19	INTEGER	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.
INT swMSTPInstPriority	1.3.6.1.4.1.171.12.15.2.3.1.12	INTEGER	read-create	The priority of the instance. The priority must be dividable by 4096
BRI swMSTPInstRegionalRootBridge	1.3.6.1.4.1.171.12.15.2.3.1.15	BridgeId	read-only	For CIST, Regional Root Identifier is the Bridge Identifier of the single bridge in a Region whose CIST Root Port is a Boundary Port, or the Bridge Identifier of the CIST Root if that is within the Region; For MSTI,MSTI Regional Root Identifier is the Bridge Identifier of the MSTI Regional Root for this particular MSTI in this MST Region; The Regional Root Bridge of this instance.
INT swMSTPInstRemainHops	1.3.6.1.4.1.171.12.15.2.3.1.23	INTEGER	read-only	.
INT swMSTPInstRootPort	1.3.6.1.4.1.171.12.15.2.3.1.18	INTEGER	read-only	The port number of the port which offers the lowest cost path from this bridge to the CIST or MSTI root bridge.
ROW swMSTPInstRowStatus	1.3.6.1.4.1.171.12.15.2.3.1.24	RowStatus	read-create	This object indicates the RowStatus of this entry.
INT swMSTPInstStatus	1.3.6.1.4.1.171.12.15.2.3.1.11	INTEGER	read-only	The instance state that could be enabled/disabled.
CTR swMSTPInstTopChangesCount	1.3.6.1.4.1.171.12.15.2.3.1.22	Counter	read-only	The total number of topology changes detected by this bridge since the management entity was last reset or initialized.
INT swMSTPInstType	1.3.6.1.4.1.171.12.15.2.3.1.10	INTEGER	read-only	This object indicates the type of instance.
OCT swMSTPInstVlanRangeList129to192	1.3.6.1.4.1.171.12.15.2.3.1.4	OCTET STRING	read-create	This object indicates the VLAN range (1025-1536) that belongs to the instance.
OCT swMSTPInstVlanRangeList193to256	1.3.6.1.4.1.171.12.15.2.3.1.5	OCTET STRING	read-create	This object indicates the VLAN range(1537-2048) that belongs to the instance.
OCT swMSTPInstVlanRangeList1to64	1.3.6.1.4.1.171.12.15.2.3.1.2	OCTET STRING	read-create	This object indicates the VLAN range (1-512) that belongs to the instance.
OCT swMSTPInstVlanRangeList257to320	1.3.6.1.4.1.171.12.15.2.3.1.6	OCTET STRING	read-create	This object indicates the VLAN range (2049-2560) that belongs to the instance.
OCT swMSTPInstVlanRangeList321to384	1.3.6.1.4.1.171.12.15.2.3.1.7	OCTET STRING	read-create	This object indicates the VLAN range (2561-3072) that belongs to the instance.
OCT swMSTPInstVlanRangeList385to448	1.3.6.1.4.1.171.12.15.2.3.1.8	OCTET STRING	read-create	This object indicates the VLAN range (3073-3584) that belongs to the instance.
OCT swMSTPInstVlanRangeList449to512	1.3.6.1.4.1.171.12.15.2.3.1.9	OCTET STRING	read-create	This object indicates the VLAN range (3585-4096) that belongs to the instance.
OCT swMSTPInstVlanRangeList65to128	1.3.6.1.4.1.171.12.15.2.3.1.3	OCTET STRING	read-create	This object indicates the VLAN range (513-1024) that belongs to the instance.
swMSTPMIB	1.3.6.1.4.1.171.12.15			The MIB module for managing MSTP.
INT swMSTPMstPort	1.3.6.1.4.1.171.12.15.2.5.1.1	INTEGER	read-only	The port number of the port for this entry.
BRI swMSTPMstPortDesignatedBridge	1.3.6.1.4.1.171.12.15.2.5.1.3	BridgeId	read-only	.
swMSTPMstPortEntry	1.3.6.1.4.1.171.12.15.2.5.1		not-accessible	A list of information maintained by every port about the MST state for that port.
INT swMSTPMstPortInsID	1.3.6.1.4.1.171.12.15.2.5.1.2	INTEGER	read-only	This object indicates the MSTP Instance Id(MSTID).
INT swMSTPMstPortInternalPathCost	1.3.6.1.4.1.171.12.15.2.5.1.4	INTEGER	read-write	This is the value of this port to the path cost of paths towards the MSTI root.
INT swMSTPMstPortPriority	1.3.6.1.4.1.171.12.15.2.5.1.5	INTEGER	read-write	The value of the priority field which is contained in the first (in network byte order) octet of the (2 octet long) Port ID..
INT swMSTPMstPortRole	1.3.6.1.4.1.171.12.15.2.5.1.7	INTEGER	read-only	When the port Enable state is enabled, the port's current port role as defined by application of the Spanning Tree Protocol. If the Port Enable state is disabled, the the port role will be nonstp(5)
INT swMSTPMstPortStatus	1.3.6.1.4.1.171.12.15.2.5.1.6	INTEGER	read-only	When the port Enable state is enabled, the port's current state as defined by application of the Spanning Tree Protocol. If the PortEnable is disabled, the the port status will be no-stp-enabled(7); If the port is in error disabled status, the port status will be err-disable(8)
swMSTPMstPortTable	1.3.6.1.4.1.171.12.15.2.5		not-accessible	A table that contains port-specific information for the MST Protocol.
OCT swMSTPName	1.3.6.1.4.1.171.12.15.2.1	OCTET STRING	read-write	The object indicates the name of MST Configuration Identication.
INT swMSTPPort	1.3.6.1.4.1.171.12.15.2.4.1.1	INTEGER	read-only	The port number of the port for this entry.
INT swMSTPPortAdminEdgePort	1.3.6.1.4.1.171.12.15.2.4.1.7	INTEGER	read-write	The value of the Edge Port parameter. A value of TRUE indicates that this port should be assumed as an edge-port and a value of FALSE indicates that this port should be assumed as a non-edge-port
INT swMSTPPortAdminHelloTime	1.3.6.1.4.1.171.12.15.2.4.1.3	INTEGER	read-write	The amount of time between the transmission of BPDU by this node on any port when it is the root of the spanning tree or trying to become so, in units of hundredths of a second.
INT swMSTPPortAdminP2P	1.3.6.1.4.1.171.12.15.2.4.1.9	INTEGER	read-write	The point-to-point status of the LAN segment attached to this port.
INT swMSTPPortBPDUFiltering	1.3.6.1.4.1.171.12.15.2.4.1.12	INTEGER	read-write	The enabled/disabled status is used to BPDU Filtering attached to this port.
swMSTPPortEntry	1.3.6.1.4.1.171.12.15.2.4.1		not-accessible	A list of information maintained by every port about the Spanning Tree Protocol state for that port.
INT swMSTPPortExternalPathCost	1.3.6.1.4.1.171.12.15.2.4.1.5	INTEGER	read-write	The contribution of this port to the path cost of paths towards the CIST root which include this port.
INT swMSTPPortLBD	1.3.6.1.4.1.171.12.15.2.4.1.11	INTEGER	read-write	The enabled/disabled status is used to Loop-back prevention attached to this port.
T/F swMSTPPortMigration	1.3.6.1.4.1.171.12.15.2.4.1.6	TruthValue	read-write	When operating in MSTP mode or RSTP mode, writing TRUE(1) to this object forces this port to transmit MST BPDUs. Any other operation on this object has no effect and it always returns FALSE(2) when read.
INT swMSTPPortOperEdgePort	1.3.6.1.4.1.171.12.15.2.4.1.8	INTEGER	read-only	It is the acuture value of edge port status
INT swMSTPPortOperHelloTime	1.3.6.1.4.1.171.12.15.2.4.1.2	INTEGER	read-only	Is the actual value of the hello time.
INT swMSTPPortOperP2P	1.3.6.1.4.1.171.12.15.2.4.1.10	INTEGER	read-only	It is the acture value of P2P status.
T/F swMSTPPortRestrictedRole	1.3.6.1.4.1.171.12.15.2.4.1.13	TruthValue	read-write	If TRUE, causes the port not to be selected as Root Port for the CIST or any MSTI, even it has the best spanning tree priority vector.
T/F swMSTPPortRestrictedTCN	1.3.6.1.4.1.171.12.15.2.4.1.14	TruthValue	read-write	If TRUE, causes the port not to propagate received topology change notifications and topology changes to other Ports.
swMSTPPortTable	1.3.6.1.4.1.171.12.15.2.4		not-accessible	A table that contains port-specific information for the Spanning Tree Protocol.
INT swMSTPRevisionLevel	1.3.6.1.4.1.171.12.15.2.2	INTEGER	read-write	The object indicates the revision level of the MST Configuration Identification.
INT swMSTPStpAdminState	1.3.6.1.4.1.171.12.15.1.1	INTEGER	read-write	This object indicates the spanning tree state of the bridge.
INT swMSTPStpForwardBPDU	1.3.6.1.4.1.171.12.15.1.8	INTEGER	read-write	The enabled/disabled status is used to forward BPDU to non stp port.
INT swMSTPStpForwardDelay	1.3.6.1.4.1.171.12.15.1.5	INTEGER	read-write	This value, controls how long a port changes its spanning state from blocking to learning state and from learning to forwarding state. Note that the range for this parameter is related to MaxAge
INT swMSTPStpHelloTime	1.3.6.1.4.1.171.12.15.1.4	INTEGER	read-write	The value is used for HelloTime when this bridge is acting in RSTP or STP mode. Only in RSTP or STP mode can read/write this value.
INT swMSTPStpLBD	1.3.6.1.4.1.171.12.15.1.9	INTEGER	read-write	The enabled/disabled status is used to Loop-back prevention.
INT swMSTPStpLBDRecoverTime	1.3.6.1.4.1.171.12.15.1.10	INTEGER	read-write	The period of time(in second) on which STP module keeps checking the BPDU loop status, The valid range is 60 to 1000000 . If set this value from 1 to 59 will get 'bad value' return code. The value of zero is a special value which means to disable the auto-recovery mechanism for LBD feature.
INT swMSTPStpMaxAge	1.3.6.1.4.1.171.12.15.1.3	INTEGER	read-write	The value that all bridges use for MaxAge when this bridge is acting as the root. Note that the range for this parameter is related to the value of StpForwardDelay and PortAdminHelloTime. MaxAge = 2(HelloTime + 1) The granularity of this timer is specified by 802.1D-1990 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.
INT swMSTPStpMaxHops	1.3.6.1.4.1.171.12.15.1.6	INTEGER	read-write	This value applies to all Spanning Trees within an MST Region for which the Bridge is the Regional Root.
INT swMSTPSTPPortEnable	1.3.6.1.4.1.171.12.15.2.4.1.4	INTEGER	read-write	The enabled/disabled status of the port.
INT swMSTPStpTxHoldCount	1.3.6.1.4.1.171.12.15.1.7	INTEGER	read-write	The value used by the Port Transmit state machine to limit the maximum transmission rate.
INT swMSTPStpVersion	1.3.6.1.4.1.171.12.15.1.2	INTEGER	read-write	The version of Spanning Tree Protocol the bridge is currently running.

RFC description

Multiple Spanning Tree Protocol management for bridge instance control and port topology state.

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Download MSTP-MIB

What Is MSTP-MIB?

Supported Devices

Monitoring Examples

What Can Be Monitored

This MIB depends on

Related MIBs

RFC description