NMS-STP

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Category: STP/RSTP

Description: Manages NMS Communications Spanning Tree Protocol port states, bridge priority, and topology change events.

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What Is NMS-STP?

NMS-STP is a vendor-specific MIB from NMS Communications that models Spanning Tree Protocol (STP/RSTP/MSTP) hardening features on switch ports, including PortFast, BPDU Guard, BPDU Filter, UplinkFast, BackboneFast, Loop Guard, and Root Guard. It exposes both global enable/disable scalars (stpOptfPortFast, stpOptfBpduGuard, stpOptfBpduFilter, stpOptfUplinkFast, stpOptfBackboneFast, stpOptfLoopGuard) and a per-interface stpPortOptfTable, indexed by ifIndex, holding the same set of protections plus a combined stpPortOptfRootLoopGuard object. This kind of data is useful for monitoring because it reveals whether loop-prevention and fast-convergence protections are actually enabled on a per-port basis, which matters when diagnosing unexpected forwarding-state changes or topology instability. It depends on the standard ifIndex identifiers from RFC1213-MIB to map STP settings onto physical interfaces, and it is deployed on NMS Communications switches running Layer 2 spanning tree; administrators can download the NMS-STP MIB file to load it into their MIB browser.

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

nms Co., Ltd. switch (STP/RSTP/MSTP hardening features, vendor unidentified)

Monitoring Examples

An operator polls stpPortOptfTable entries for a given ifIndex to confirm that stpPortOptfBpduGuard and stpPortOptfLoopFast are set to enabled(1) on access ports; if stpPortOptfPortFast shows enabled while stpPortOptfBpduGuard is disabled on the same port, that combination would flag a misconfigured edge port vulnerable to accidental loop formation.

What Can Be Monitored

per-port PortFast state
BPDU Guard/Filter status
UplinkFast and BackboneFast enablement
Loop Guard and Root Guard state
combined root/loop guard mode per port

Imported Objects

From NMS-SMI

nmsMgmt

OBJECT-IDENTITY

From RFC1213-MIB

ifIndex

From SNMPv2-CONF

MODULE-COMPLIANCE
NOTIFICATION-GROUP
OBJECT-GROUP

From SNMPv2-SMI

Counter64
Integer32
MODULE-IDENTITY
NOTIFICATION-TYPE
OBJECT-TYPE
Unsigned32

OIDs

OID symbolic	OID numeric	Type	Access	Description
stp	1.3.6.1.4.1.11606.10.9.253
INT stpOptfPortFast	1.3.6.1.4.1.11606.10.9.253.1	INTEGER	read-write	Port Fast immediately brings a port to the forwarding state from a blocking state, bypassing the listening and learning states.
INT stpOptfBpduGuard	1.3.6.1.4.1.11606.10.9.253.2	INTEGER	read-write	BPDU guard can operate in all spanning tree modes, but the feature operates with some differences. In SSTP and PVST modes, if a Port Fast-enabled port receives a BPDU,it will be shutdown. In RSTP and MSTP modes, if a port receives a BPDU, it will be blocked for double forward time. In all spanning tree modes, a BPDU guard-enabled port will not send BPDUs.
INT stpOptfBpduFilter	1.3.6.1.4.1.11606.10.9.253.3	INTEGER	read-write	This feature prevents ports from sending BPDUs. If a BPDU is received on a Port Fast-enabled port, the port loses its Port Fast-operational status,and BPDU filtering is disabled.
INT stpOptfUplinkFast	1.3.6.1.4.1.11606.10.9.253.4	INTEGER	read-write	UplinkFast can accelerate the choice of a new root port when a link or switch fails or when the spanning tree reconfigures itself. The root port transitions to the forwarding state immediately without going through the listening and learning states, as it would with the normal spanning-tree procedures.
INT stpOptfBackboneFast	1.3.6.1.4.1.11606.10.9.253.5	INTEGER	read-write	BackboneFast detects indirect failures in the core of the backbone. When a switch receives an inferior BPDU from the designated port of another switch, the BPDU is a signal that the other switch might have lost its path to the root, and BackboneFast tries to find an alternate path to the root.
INT stpOptfLoopGuard	1.3.6.1.4.1.11606.10.9.253.6	INTEGER	read-write	Loop guard prevents alternate and root ports from becoming designated ports. In SSTP and PVST modes, if a Loop guard-enabled port is designated port, it is always blocked. In RSTP and MSTP modes, if a Loop guard-enabled port becomes designated port because of a failure that can't receive BPDUs, it is blocked.
stpPortOptfTable	1.3.6.1.4.1.11606.10.9.253.7		not-accessible	A table of stpPortOptf operation.
stpPortOptfTableEntry	1.3.6.1.4.1.11606.10.9.253.7.1		not-accessible	A collection of Stp Port Optf operation.
INT stpPortOptfPortFast	1.3.6.1.4.1.11606.10.9.253.7.1.1	INTEGER	read-write	Port Fast immediately brings a port to the forwarding state from a blocking state, bypassing the listening and learning states.
INT stpPortOptfBpduGuard	1.3.6.1.4.1.11606.10.9.253.7.1.2	INTEGER	read-write	BPDU guard can operate in all spanning tree modes, but the feature operates with some differences. In SSTP and PVST modes, if a Port Fast-enabled port receives a BPDU,it will be shutdown. In RSTP and MSTP modes, if a port receives a BPDU, it will be blocked for double forward time. In all spanning tree modes, a BPDU guard-enabled port will not send BPDUs.
INT stpPortOptfBpduFilter	1.3.6.1.4.1.11606.10.9.253.7.1.3	INTEGER	read-write	This featue prevents ports from sending BPDUs. If a BPDU is received on a Port Fast-enabled port, the port loses its Port Fast-operational status,and BPDU filtering is disabled.
INT stpPortOptfLoopFast	1.3.6.1.4.1.11606.10.9.253.7.1.4	INTEGER	read-write	This feature is used to minimize the convergence time in RSTP mode.
INT stpPortOptfRootLoopGuard	1.3.6.1.4.1.11606.10.9.253.7.1.5	INTEGER	read-write	Root Guard prevents a port that is receiving superior BPDUs from becoming root port. In SSTP and PVST modes, if a Root Guard-enabled port is receiving superior BPDUs, it is always blocked. In RSTP and MSTP modes, if a Root Guard-enabled port originally didn't receive superior BPDUs, but now it is receiving superior BPUDs, it is blocked. Loop guard prevents alternate and root ports from becoming designated ports. In SSTP and PVST modes, if a Loop guard-enabled port is designated port, it is always blocked. In RSTP and MSTP modes, if a Loop guard-enabled port becomes designated port because of a failure that can't receive BPDUs, it is blocked.

RFC description

Provides configuration and monitoring for Spanning Tree Protocol enhancements on NMS devices.

Start monitoring nms Co., Ltd. switch (STP/RSTP/MSTP hardening features, vendor unidentified) 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 NMS-STP

What Is NMS-STP?

Supported Devices

Monitoring Examples

What Can Be Monitored

This MIB depends on

Related MIBs

RFC description