All MIBs › IEEE8021-MSTP-MIB › ieee8021MstpCistTopologyChange
ieee8021MstpCistTopologyChange
Module: IEEE8021-MSTP-MIB
OID (symbolic): IEEE8021-MSTP-MIB::ieee8021MstpCistTopologyChange
OID (numeric): 1.3.111.2.802.1.1.6.1.1.1.3
Node type: OBJECT-TYPE
Type: TruthValue
Access: read-only
Description: In an STP Bridge, the value of the Topology Change parameter (14.8.1.1.3, item d of IEEE Std 802.1D, 2004 Edition), or in an RSTP or MSTP Bridge, asserted if the tcWhile timer for any Port for the CIST is non-zero.
What is ieee8021MstpCistTopologyChange?
True whenever any port's topology-change timer (tcWhile) is currently running for the CIST, meaning a recent topology change is still being flooded through the network — a switch stuck with this true for a long time suggests a flapping link somewhere.
Examples
Walk all instances (SNMPv2c):
snmpwalk -v2c -c public <target> 1.3.111.2.802.1.1.6.1.1.1.3 snmpwalk -v2c -c public <target> IEEE8021-MSTP-MIB::ieee8021MstpCistTopologyChange
Get a specific instance (index 1):
snmpget -v2c -c public <target> 1.3.111.2.802.1.1.6.1.1.1.3.1 snmpget -v2c -c public <target> IEEE8021-MSTP-MIB::ieee8021MstpCistTopologyChange.1
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OID Breakdown
Upper-level ancestors (3 from the standard OID tree / other modules)
| Numeric OID | Name | Module |
|---|---|---|
| 1 | iso | LANART-AGENT |
| 1.3 | org | AirPair-MIB |
| 1.3.111.2.802.1.1 | ieee802dot1mibs | IEEE8021-TC-MIB |
| Numeric OID | Name | Module |
|---|---|---|
| 1.3.111.2.802.1.1.6 | ieee8021MstpMib | IEEE8021-MSTP-MIB |
| 1.3.111.2.802.1.1.6.1 | ieee8021MstpObjects | IEEE8021-MSTP-MIB |
| 1.3.111.2.802.1.1.6.1.1 | ieee8021MstpCistTable | IEEE8021-MSTP-MIB |
| 1.3.111.2.802.1.1.6.1.1.1 | ieee8021MstpCistEntry | IEEE8021-MSTP-MIB |
| 1.3.111.2.802.1.1.6.1.1.1.3 | ieee8021MstpCistTopologyChange | IEEE8021-MSTP-MIB |