STP-MIB

All MIBs › STP-MIB

Organization: admin Inc.

Last Updated: 1999-04-23

Category: Spanning Tree

Description: Manages Spanning Tree Protocol bridge and port configuration, state machines, and topology change events.

Start monitoring vendor-neutral, standards-based MIB, any SNMPv3-capable network device (SNMP engine identity/boot/clock status) with a free 30-day trial of IPNetwork Monitor. Import MIBs, browse SNMP OIDs, create custom SNMP monitors, configure alerts, and monitor any SNMP-enabled network device from a single console.

What Is STP-MIB?

STP-MIB is a vendor-neutral module for Spanning Tree Protocol (IEEE 802.1D) management on Ethernet bridges and switches, covering bridge and per-port STP configuration, state machines, and topology-change events. It exposes networking/protocol data rather than physical sensors: bridge and port roles, states, priorities, and topology-change notifications. The sampled objects here (stpMIBConformance, stpMIBGroups, stpMIBCompliances) are conformance/compliance statements defining which object groups an agent must implement, so this instance is largely a conformance wrapper rather than a runtime data table; the underlying protocol data it mandates covers port forwarding/blocking state and root-bridge identification, which are key software-status indicators for detecting network loops or link flapping. It is closely tied to the IEEE 802.1D/802.1w standards and complements the standard BRIDGE-MIB. It is deployed on any managed Ethernet switch participating in a spanning-tree topology, especially in campus and data-center LANs. Engineers implementing or auditing this functionality typically reference the STP-MIB RFC/standard documentation for the authoritative specification.

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

vendor-neutral, standards-based MIB, not tied to a specific manufacturer
managed Ethernet switch/bridge

Monitoring Examples

The sampled objects (stpMIBConformance, stpMIBGroups, stpMIBCompliances) are conformance statements, not runtime data objects, so this instance does not itself expose pollable counters; it instead specifies that a compliant agent must implement the underlying per-port STP state and bridge identification objects. In practice an admin relying on those mandated objects would poll per-port state (forwarding/blocking/listening) and the topology-change counter to detect an unstable link causing repeated STP recalculations. A jump in topology-change count combined with a port cycling between blocking and forwarding typically indicates a flapping uplink or misconfigured redundant path.

Imported Objects

From ADMIN-MASTER-MIB

gbnL2

OBJECT-IDENTITY

From SNMPv2-CONF

MODULE-COMPLIANCE
OBJECT-GROUP

From SNMPv2-SMI

Counter32
Integer32
MODULE-IDENTITY
OBJECT-TYPE
TimeTicks

How to Use in IPNetwork Monitor

Example using stpDot1dStpTopChanges OID:

Select a device implementing STP-MIB 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 stpDot1dStpTopChanges into the Find box to locate it in the OID tree, then select it and click OK. The total number of topology changes detected by this bridge since the management entity was last reset or initialized. 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
stpMib	1.3.6.1.4.1.13464.1.2.4.3			STP module management.
stpMIBObjects	1.3.6.1.4.1.13464.1.2.4.3.1
stpDot1dStp	1.3.6.1.4.1.13464.1.2.4.3.1.1
INT stpDot1dStpProtocolSpecification	1.3.6.1.4.1.13464.1.2.4.3.1.1.1	INTEGER	read-only	An indication of what version of the Spanning Tree Protocol is being run. The value 'decLb100(2)' indicates the DEC LANbridge 100 Spanning Tree protocol. IEEE 802.1d implementations will return 'ieee8021d(3)'. If future versions of the IEEE Spanning Tree Protocol are released that are incompatible with the current version a new value will be defined.
INT stpDot1dStpPriority	1.3.6.1.4.1.13464.1.2.4.3.1.1.2	INTEGER	read-write	DURABLE: { 32768:all } The value of the write-able portion of the Bridge ID, i.e., the first two octets of the (8 octet long) Bridge ID. The other (last) 6 octets of the Bridge ID are given by the value of dot1dBaseBridgeAddress.The value has to be a multiple of 4096
TIK stpDot1dStpTimeSinceTopologyChange	1.3.6.1.4.1.13464.1.2.4.3.1.1.3	TimeTicks	read-only	The time (in hundredths of a second) since the last time a topology change was detected by the bridge entity.
C32 stpDot1dStpTopChangesEx	1.3.6.1.4.1.13464.1.2.4.3.1.1.4	Counter32	read-only	The total number of topology changes detected by this bridge since the management entity was last reset or initialized.
BRI stpDot1dStpDesignatedRoot	1.3.6.1.4.1.13464.1.2.4.3.1.1.5	BridgeId	read-only	The bridge identifier of the root of the spanning tree as determined by the Spanning Tree Protocol as executed by this node. This value is used as the Root Identifier parameter in all Configuration Bridge PDUs originated by this node.
I32 stpDot1dStpRootCost	1.3.6.1.4.1.13464.1.2.4.3.1.1.6	Integer32	read-only	The cost of the path to the root as seen from this bridge.
I32 stpDot1dStpRootPort	1.3.6.1.4.1.13464.1.2.4.3.1.1.7	Integer32	read-only	The port number of the port which offers the lowest cost path from this bridge to the root bridge.
TIM stpDot1dStpMaxAge	1.3.6.1.4.1.13464.1.2.4.3.1.1.8	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 stpDot1dStpHelloTime	1.3.6.1.4.1.13464.1.2.4.3.1.1.9	Timeout	read-only	The amount of time between the transmission of Configuration bridge PDUs 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. This is the actual value that this bridge is currently using.
I32 stpDot1dStpHoldTime	1.3.6.1.4.1.13464.1.2.4.3.1.1.10	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 stpDot1dStpForwardDelay	1.3.6.1.4.1.13464.1.2.4.3.1.1.11	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 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. [Note that this value is the one that this bridge is currently using, in contrast to stpDot1dStpBridgeForwardDelay which is the value that this bridge and all others would start using if/when this bridge were to become the root.]
TIM stpDot1dStpBridgeMaxAge	1.3.6.1.4.1.13464.1.2.4.3.1.1.12	Timeout	read-write	DURABLE: { 2000:all } The value that all bridges use for MaxAge when this bridge is acting as the root. Note that 802.1D-1990 specifies that the range for this parameter is related to the value of stpDot1dStpBridgeHelloTime. 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.
TIM stpDot1dStpBridgeHelloTime	1.3.6.1.4.1.13464.1.2.4.3.1.1.13	Timeout	read-write	DURABLE: { 200:all } The value that all bridges use for HelloTime when this bridge is acting as the root. 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.
TIM stpDot1dStpBridgeForwardDelay	1.3.6.1.4.1.13464.1.2.4.3.1.1.14	Timeout	read-write	DURABLE: { 1500:all } The value that all bridges use for ForwardDelay when this bridge is acting as the root. Note that 802.1D-1990 specifies that the range for this parameter is related to the value of stpDot1dStpBridgeMaxAge. 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.
stpDot1dStpPortTable	1.3.6.1.4.1.13464.1.2.4.3.1.1.15		not-accessible	A table that contains port-specific information for the Spanning Tree Protocol.
stpDot1dStpPortEntry	1.3.6.1.4.1.13464.1.2.4.3.1.1.15.1		not-accessible	A list of information maintained by every port about the Spanning Tree Protocol state for that port.
INT stpDot1dStpPort	1.3.6.1.4.1.13464.1.2.4.3.1.1.15.1.1	INTEGER	read-only	The port number of the port for which this entry contains Spanning Tree Protocol management information.
INT stpDot1dStpPortPriority	1.3.6.1.4.1.13464.1.2.4.3.1.1.15.1.2	INTEGER	read-write	DURABLE: { 128:all } The value of the priority field which is contained in the first (in network byte order) octet of the (2 octet long) Port ID. The other octet of the Port ID is given by the value of stpDot1dStpPort.The value has to be a multiple of 16
INT stpDot1dStpPortState	1.3.6.1.4.1.13464.1.2.4.3.1.1.15.1.3	INTEGER	read-only	The port's current state as defined by application of the Spanning Tree Protocol. This state controls what action a port takes on reception of a frame. If the bridge has detected a port that is malfunctioning it will place that port into the broken(6) state. For ports which are disabled (see stpDot1dStpPortEnable), this object will have a value of disabled(1).
INT stpDot1dStpPortEnable	1.3.6.1.4.1.13464.1.2.4.3.1.1.15.1.4	INTEGER	read-write	The enabled/disabled status of the port.
INT stpDot1dStpPortPathCost	1.3.6.1.4.1.13464.1.2.4.3.1.1.15.1.5	INTEGER	read-write	DURABLE: { 10:all } The contribution of this port to the path cost of paths towards the spanning tree root which include this port. 802.1D-1990 recommends that the default value of this parameter be in inverse proportion to the speed of the attached LAN.
BRI stpDot1dStpPortDesignatedRoot	1.3.6.1.4.1.13464.1.2.4.3.1.1.15.1.6	BridgeId	read-only	The unique Bridge Identifier of the Bridge recorded as the Root in the Configuration BPDUs transmitted by the Designated Bridge for the segment to which the port is attached.
I32 stpDot1dStpPortDesignatedCost	1.3.6.1.4.1.13464.1.2.4.3.1.1.15.1.7	Integer32	read-only	The path cost of the Designated Port of the segment connected to this port. This value is compared to the Root Path Cost field in received bridge PDUs.
BRI stpDot1dStpPortDesignatedBridge	1.3.6.1.4.1.13464.1.2.4.3.1.1.15.1.8	BridgeId	read-only	The Bridge Identifier of the bridge which this port considers to be the Designated Bridge for this port's segment.
OCT stpDot1dStpPortDesignatedPort	1.3.6.1.4.1.13464.1.2.4.3.1.1.15.1.9	OCTET STRING	read-only	The Port Identifier of the port on the Designated Bridge for this port's segment.
C32 stpDot1dStpPortForwardTransitions	1.3.6.1.4.1.13464.1.2.4.3.1.1.15.1.10	Counter32	read-only	The number of times this port has transitioned from the Learning state to the Forwarding state.
INT stpDot1dRemoteLoopDetect	1.3.6.1.4.1.13464.1.2.4.3.1.1.15.1.11	INTEGER	read-write	The LOOP DETECT status of the port.
INT stpDot1wRstpPortTxHoldCount	1.3.6.1.4.1.13464.1.2.4.3.1.1.15.1.12	INTEGER	read-write	Maximum number of BPDUs allowed to be transmitted during per helloTime
INT stpDot1wRstpPortOperP2p	1.3.6.1.4.1.13464.1.2.4.3.1.1.15.1.13	INTEGER	read-only	The operational point-to-point status of the LAN segment attached to this port
INT stpDot1wRstpPortOperEdge	1.3.6.1.4.1.13464.1.2.4.3.1.1.15.1.14	INTEGER	read-only	The operational value of the Edge Port parameter
INT stpDot1wRstpPortMcheck	1.3.6.1.4.1.13464.1.2.4.3.1.1.15.1.15	INTEGER	read-write	force port into transmitting rstp packets
INT stpDot1wRstpPortTxTcn	1.3.6.1.4.1.13464.1.2.4.3.1.1.15.1.16	INTEGER	read-only	Output statistics of TCN packets
INT stpDot1wRstpPortTxConfig	1.3.6.1.4.1.13464.1.2.4.3.1.1.15.1.17	INTEGER	read-only	Output statistics of CONFIG packets
INT stpDot1wRstpPortTxRstp	1.3.6.1.4.1.13464.1.2.4.3.1.1.15.1.18	INTEGER	read-only	Output statistics of RSTP packets
INT stpDot1wRstpPortRxTcn	1.3.6.1.4.1.13464.1.2.4.3.1.1.15.1.19	INTEGER	read-only	Input statistics of TCN packets
INT stpDot1wRstpPortRxConfig	1.3.6.1.4.1.13464.1.2.4.3.1.1.15.1.20	INTEGER	read-only	Input statistics of CONFIG packets
INT stpDot1wRstpPortRxRstp	1.3.6.1.4.1.13464.1.2.4.3.1.1.15.1.21	INTEGER	read-only	Input statistics of RSTP packets
INT stpDot1wRstpPortClear	1.3.6.1.4.1.13464.1.2.4.3.1.1.15.1.22	INTEGER	read-write	Clear port spanning-tree statistics
INT stpDot1wRstpPortAdminP2p	1.3.6.1.4.1.13464.1.2.4.3.1.1.15.1.23	INTEGER	read-write	The administrative point-to-point status of the LAN segment attached to this port
INT stpDot1wRstpPortAdminEdge	1.3.6.1.4.1.13464.1.2.4.3.1.1.15.1.24	INTEGER	read-write	The administrative value of the Edge Port parameter
INT stpPropStpEnable	1.3.6.1.4.1.13464.1.2.4.3.1.1.16	INTEGER	read-write	DURABLE: { enabled:all } The enabled/disabled status of STP for the bridge entity.
INT spanOnOff	1.3.6.1.4.1.13464.1.2.4.3.1.1.17	INTEGER	read-write	DURABLE: { enable } Enable/Disable Spanning Tree for the bridge. When 'disable(2)', all ports of the device are placed in the forwarding mode, regardless of current Spanning Tree state. When 'enable(1)', the normal STP state transitions take place.
stpDot1dStpTrap	1.3.6.1.4.1.13464.1.2.4.3.1.1.18
NTF stpDot1dStpPortBlocking	1.3.6.1.4.1.13464.1.2.4.3.1.1.18.1			Port status is turned from forwarding to blocking.
NTF stpDot1dStpPortException	1.3.6.1.4.1.13464.1.2.4.3.1.1.18.2			Port packet flood to CPU rate is too big, port exception happen.
NTF stpDot1dStpPortRecover	1.3.6.1.4.1.13464.1.2.4.3.1.1.18.3			Port recover time pass after port encounter port CAR exception, and Port packet flood to CPU rate is normal, recover port.
NTF stpDot1dStpPortRmtLoop	1.3.6.1.4.1.13464.1.2.4.3.1.1.18.4			Port is blocked because of remote loop.
NTF stpDot1dStpPortRmtLoopFree	1.3.6.1.4.1.13464.1.2.4.3.1.1.18.5			Port is released from remote loop.
NTF stpDot1dStpNewRoot	1.3.6.1.4.1.13464.1.2.4.3.1.1.18.6			Root bridge changed for the stp.
NTF stpDot1dStpPortForwarding	1.3.6.1.4.1.13464.1.2.4.3.1.1.18.7			Port status is turned from blocking to forwarding.
INT stpDot1wRstpForceVersion	1.3.6.1.4.1.13464.1.2.4.3.1.1.19	INTEGER	read-write	which protocol mode the bridge chooses to execute ,RSTP or STP compatible
stpMIBConformance	1.3.6.1.4.1.13464.1.2.4.3.2
stpMIBGroups	1.3.6.1.4.1.13464.1.2.4.3.2.1
stpMIBBaseGroup	1.3.6.1.4.1.13464.1.2.4.3.2.1.1			STP module groups.
stpMIBCompliances	1.3.6.1.4.1.13464.1.2.4.3.2.2
stpMIBCompliance	1.3.6.1.4.1.13464.1.2.4.3.2.2.1			The compliance statement for STP module.

RFC description

Monitors Spanning Tree Protocol parameters, bridge IDs, and timer configuration for switch networks.

Start monitoring vendor-neutral, standards-based MIB, managed Ethernet switch/bridge running Spanning Tree Protocol (802.1D) with a free 30-day trial of IPNetwork Monitor. Import MIBs, browse SNMP OIDs, create custom SNMP monitors, configure alerts, and monitor any SNMP-enabled network device from a single console.

Download STP-MIB

What Is STP-MIB?

Supported Devices

Monitoring Examples

This MIB depends on

Related MIBs

How to Use in IPNetwork Monitor

RFC description