Performance issue of WS-X4013 on 4006

[douglashui]

Dear All,

I have created many vlan on 4006 switch with sup WS-X4013. I found that the cpu usage is high (esp. on STP process).

What is the maximum number of vlan and stp support on WS-X4013 with 4006?

How can I solve this high cpu problem.

Thanks.

[leonvd79]

With many VLANs configured PVST+/Per-VLAN RSTP is known for high CPU utilization.

The solution would be to look for an alternative; Multiple Spanning Tree which is capable of load balancing traffic on a single instance per multiple-VLANs instead of maintaining a single instance per-VLAN.

HTH

Leon

* Please rate useful posts.

[Prashanth Krishnappa]

What you need consider is the number of STP logical ports. The release notes has the maximum supported logical ports details.

http://www.cisco.com/univercd/cc/td/doc/product/lan/cat4000/relnotes/ol_4502.htm#wp78893

[Jacob-Harris]

You could try limiting which VLANS are allowed on which ports. We ran into this issue a while back and ended up limiting all of our trunk ports to 1-3 specific vlans each. The greatly reduced our High cpu usage.