RSTP-MIB

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Organization: IETF Bridge MIB Working Group

Last Updated: 2005-12-07

Category: VLAN and Bridging

Description: Defines managed objects for bridges implementing the Rapid Spanning Tree Protocol (IEEE 802.1w), providing faster convergence parameters beyond the base BRIDGE-MIB.

IPNetwork Monitor uses several OIDs from this MIB in network discovery and polling the applicable devices. Start monitoring RSTP-MIB with a free 30-day trial of IPNetwork Monitor.

What Is RSTP-MIB?

RSTP-MIB is the vendor-neutral IETF standards MIB (RFC 4318) that extends the base BRIDGE-MIB to manage IEEE 802.1w Rapid Spanning Tree Protocol on Ethernet bridges/switches, the faster-converging successor to classic STP. It exposes spanning-tree protocol configuration and per-port state such as STP version, transmit hold count, port role/edge-port administrative and operational settings, point-to-point link detection, and path cost, alongside notifications for topology-related events. Its monitoring value is centered on software/protocol status rather than physical sensors: administrators use it to confirm whether a port is correctly negotiated as an edge port or point-to-point link, whether protocol migration has occurred, and whether the bridge is running the expected STP version -- all revealing misconfigurations that could slow convergence or cause loops. It explicitly extends the IETF BRIDGE-MIB (RFC 4188) and implements IEEE 802.1w, so it is meaningless without that base bridge MIB context. It is deployed on any managed Ethernet switch supporting RSTP, typically in enterprise or data center LANs needing rapid failover on redundant links, with the RSTP-MIB RFC (RFC 4318) serving as the definitive reference for its object definitions.

IPNetwork Monitor allows you to monitor SNMP objects defined in RSTP-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 supporting IEEE 802.1w RSTP

Monitoring Examples

An administrator would poll dot1dStpExtPortTable / dot1dStpExtPortEntry rows to check dot1dStpPortAdminEdgePort against dot1dStpPortOperEdgePort -- a mismatch reveals a port expected to be an edge port that is instead negotiating as part of the active spanning tree, delaying convergence. Checking dot1dStpPortOperPointToPoint against dot1dStpPortAdminPointToPoint confirms full-duplex point-to-point links are recognized correctly, and monitoring dot1dStpPortProtocolMigration flags a port falling back to legacy STP compatibility mode. dot1dStpVersion confirms the bridge is actually running RSTP rather than classic STP.

What Can Be Monitored

STP protocol version in use
per-port edge-port admin/oper status
per-port point-to-point link admin/oper status
port protocol migration flag
port path cost
transmit hold count

Imported Objects

From BRIDGE-MIB

dot1dStp	OBJECT-IDENTITY
dot1dStpPortEntry

From SNMPv2-CONF

MODULE-COMPLIANCE
OBJECT-GROUP

From SNMPv2-SMI

Integer32
MODULE-IDENTITY
OBJECT-TYPE
mib-2

From SNMPv2-TC

TruthValue

OIDs

OID symbolic	OID numeric	Type	Access	Description
INT dot1dStpVersion	1.3.6.1.2.1.17.2.16	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-1998 and 'rstp(2)' indicates the Rapid Spanning Tree Protocol specified in IEEE 802.1w and clause 17 of 802.1D-2004. The values are directly from the IEEE standard. New values may be defined as future versions of the protocol become available. The value of this object MUST be retained across reinitializations of the management system.
I32 dot1dStpTxHoldCount	1.3.6.1.2.1.17.2.17	Integer32	read-write	The value used by the Port Transmit state machine to limit the maximum transmission rate. The value of this object MUST be retained across reinitializations of the management system.
dot1dStpExtPortTable	1.3.6.1.2.1.17.2.19		not-accessible	A table that contains port-specific Rapid Spanning Tree information.
dot1dStpExtPortEntry	1.3.6.1.2.1.17.2.19.1		not-accessible	A list of Rapid Spanning Tree information maintained by each port.
T/F dot1dStpPortProtocolMigration	1.3.6.1.2.1.17.2.19.1.1	TruthValue	read-write	When operating in RSTP (version 2) mode, writing true(1) to this object forces this port to transmit RSTP BPDUs. Any other operation on this object has no effect and it always returns false(2) when read.
T/F dot1dStpPortAdminEdgePort	1.3.6.1.2.1.17.2.19.1.2	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. Setting this object will also cause the corresponding instance of dot1dStpPortOperEdgePort to change to the same value. Note that even when this object's value is true, the value of the corresponding instance of dot1dStpPortOperEdgePort can be false if a BPDU has been received. The value of this object MUST be retained across reinitializations of the management system.
T/F dot1dStpPortOperEdgePort	1.3.6.1.2.1.17.2.19.1.3	TruthValue	read-only	The operational value of the Edge Port parameter. The object is initialized to the value of the corresponding instance of dot1dStpPortAdminEdgePort. When the corresponding instance of dot1dStpPortAdminEdgePort is set, this object will be changed as well. This object will also be changed to false on reception of a BPDU.
INT dot1dStpPortAdminPointToPoint	1.3.6.1.2.1.17.2.19.1.4	INTEGER	read-write	The administrative point-to-point status of the LAN segment attached to this port, using the enumeration values of the IEEE 802.1w clause. 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. Manipulating this object changes the underlying adminPortToPortMAC. The value of this object MUST be retained across reinitializations of the management system.
T/F dot1dStpPortOperPointToPoint	1.3.6.1.2.1.17.2.19.1.5	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. If adminPointToPointMAC is set to auto(2), then the value of operPointToPointMAC is determined in accordance with the specific procedures defined for the MAC entity concerned, as defined in IEEE 802.1w, clause 6.5. The value is determined dynamically; that is, it is re-evaluated whenever the value of adminPointToPointMAC changes, and whenever the specific procedures defined for the MAC entity evaluate a change in its point-to-point status.
I32 dot1dStpPortAdminPathCost	1.3.6.1.2.1.17.2.19.1.6	Integer32	read-write	The administratively assigned value for the contribution of this port to the path cost of paths toward the spanning tree root. Writing a value of '0' assigns the automatically calculated default Path Cost value to the port. If the default Path Cost is being used, this object returns '0' when read. This complements the object dot1dStpPortPathCost or dot1dStpPortPathCost32, which returns the operational value of the path cost. The value of this object MUST be retained across reinitializations of the management system.
rstpMIB	1.3.6.1.2.1.134			The Bridge MIB Extension module for managing devices that support the Rapid Spanning Tree Protocol defined by IEEE 802.1w. Copyright (C) The Internet Society (2005). This version of this MIB module is part of RFC 4318; See the RFC itself for full legal notices.
rstpNotifications	1.3.6.1.2.1.134.0
rstpObjects	1.3.6.1.2.1.134.1
rstpConformance	1.3.6.1.2.1.134.2
rstpGroups	1.3.6.1.2.1.134.2.1
rstpBridgeGroup	1.3.6.1.2.1.134.2.1.1			Rapid Spanning Tree information for the bridge.
rstpPortGroup	1.3.6.1.2.1.134.2.1.2			Rapid Spanning Tree information for individual ports.
rstpCompliances	1.3.6.1.2.1.134.2.2
rstpCompliance	1.3.6.1.2.1.134.2.2.1			The compliance statement for device support of Rapid Spanning Tree Protocol (RSTP) bridging services.

RFC description

Manages IEEE 802.1w Rapid Spanning Tree Protocol configuration and status on bridge devices.

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Download RSTP-MIB

What Is RSTP-MIB?

Supported Devices

Monitoring Examples

What Can Be Monitored

This MIB depends on

Related MIBs

RFC description