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How to find which switch that is causing a topology change

Posted on 2010-09-05
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Last Modified: 2012-05-10
I have a network based on 3com switches, with a switch 5500G in the core and switch 4500 and 4400 on the edge. I have some problems with stability in the network and I have started to dig into spanning tree-related issues. When I view the STP-statistics on the coreswitch I can see that the topology in the network changes quite often (by using the "display stp"-command), even if I have not changed anything in the network. No switches are shut down and no swithes are added. It seems the the switch logs a topology change many times every dag, in fact several times per hour. My question is: How can I determine what is causing to topology change? Probably a link on a switch in the network is flapping up and down and causing the event, but how to find it? Any tips?
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Question by:thoree
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AndyEastham earned 500 total points
ID: 33609572
Firstly, the odd topology change is not necessarily a really bad thing, but naturally you want to trace the issue.

Have a look at this:
http://forums13.itrc.hp.com/service/forums/questionanswer.do?admit=109447627+1283760280987+28353475&threadId=1269077

I think the recommendations about setting the core switch priority and also checking everything has the latest firmware are the first things to check.

This post also discusses diagnostics you can try.
http://forums13.itrc.hp.com/service/forums/questionanswer.do?admit=109447627+1283760422721+28353475&threadId=1134288

Hope this helps,

Andy
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by:thoree
ID: 33731873
problem solved
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