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Switch 3550 - High CPU Utilization

Hi,

I have six 3550 switch connected in a cascading manner. But out of six switchs 3 switchs have nearly 60% CPU utilization. Please find the attached show tech file. Please help me to resovle the issue.

4 REPLIES

Re: Switch 3550 - High CPU Utilization

I dont think you should worry. The normal CPU range for the XL series is 30-80%

The 91% may be seen when you executed the sh tech command.

Also have a look at the following links

http://www.cisco.com/en/US/products/hw/switches/ps607/products_tech_note09186a0080094e78.shtml

http://www.cisco.com/en/US/products/hw/switches/ps607/products_tech_note09186a0080094e78.shtml

HTH

Narayan

New Member

Re: Switch 3550 - High CPU Utilization

Hi,

Thanks for promt reply.

But other 3 switches have 10% cpu utilization and other 3 switches have 60% utilitzation.

New Member

Re: Switch 3550 - High CPU Utilization

Are all 6 running the same IOS version? Also I had a similar problem with 2 switches and I update the IOS to the latest on just one and it fixed the CPU problem, your IOS seems quite old, might be worth updating on just one of them.

Re: Switch 3550 - High CPU Utilization

Hi,

First of all, your switch is not 3550. 3550 is not XL series, your switches are 3548XL.

Your IOS is affected by the bug regarding high-cpu utilization for "Router AutoConf Process" (Bug ID: CSCdv21552). Though from the "show proc cpu" there is no indication that your high-cpu utilization is cause by this bug, if you have an active maintenance, it will not hurt to update the IOS.

I noticed that you put "spanning-tree portfast" in all if not most of your physical interfaces. Make sure that non of them is connected to a hub, switch, or routers - otherwise you will create a network loop and will cause high-cpu utilization. "spanning-tree portfast" setting for the physical interface is recommended only if the interface is connected to a host.

Anything from the logs?

Regards,

Dandy

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