vlan 1 showing 99% utilisation due to spanning tree

Unanswered Question
May 19th, 2009

Has anyone experienced this situation with very high and sustained switch CPU consumption? (Cisco 2960)

It does not appear to be due to unstable STP (only possible unusual aspect is a Alteon load balancer running own STP also connected to the 2960) Thanks in advance

I have this problem too.
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mvsheik123 Thu, 05/21/2009 - 08:26


Did you try 'show proc cpu sorted'. It will get you sorted output based on percentage of utilization. The top process will be on the top(use the command during high utilization period). As far as spanning tree, check if the switch got any redundant connections which are blocked properly.




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