constant High CPU on 3550 and 3750 switches due to vlan 1
We are experiencing constant High CPU on 3750 switches due to vlan 1
Further info - we have a pair of Alteon load balances between the 3500 and 3750's which is also running vlan 1. Could this produce high CPU ? (Appreciate vlan 1 usage not best practice but ignore that for now). We run sho proc cpu sorted and see vlan manager proc running cpu at 90% constantly. How would vlan ID manger process push cpu to 90% and hold it there ? - appreciate any ideas on this.
Re: constant High CPU on 3550 and 3750 switches due to vlan 1
The problem you are discribing sound like a spanning tree loop.
Just a question, how is the switch port configuration for the Alteon? If they have spanning portfast enabled, turn it off and make the switch to run its spanning-tree algorithm to see this will improve. Also, you should schedule a maintenance window to test this configuration.
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