Spanning Tree Troubleshooting

Unanswered Question
Nov 3rd, 2009

Hi All,

Is there a way on a cisco switch to verify how long its been since Spanning Tree has re-converged, or even to see what *revision* number of STP is running. Essentially I want to see if spanning tree is constantly re-converging and causing network performance issues.


I have this problem too.
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Giuseppe Larosa Tue, 11/03/2009 - 11:45

Hello Mark,

some years ago we used some MIB variables that provide STP "uptime" and number of STP executions as a measure of stability.

However, we had noticed that return data was expressed or in msec or in seconds depending on the IOS version.

let us know if an SNMP MIB poling approach can fit your needs.

Hope to help


rais Tue, 11/03/2009 - 12:06

You can use:

show span vlan detail

The output contains something like:

Number of topology changes 9 last change occurred 14w5d ago......



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