Catalyst 2960S problem

[allen_huang]

Hi,

I have 4 Catalyst 2960S, and they have the same problem.

The CPU usage is 60% before I telnet them.

It fell to 20% when I using telnet to login. And raised to above 60% after logout.

This is the output of 'show proc cpu' when I login.

This is the output of 'show proc cpu' 2 mins later.

And the traffic chart will like this.

How can I to solve this problem?

The hardware & software version is:

WS-C2960S-48TS-L   12.2(53)SE1           C2960S-UNIVERSALK9-M

Many thanks for any comments.

[Ganesh Hariharan]

Hi,
I have 4 Catalyst 2960S, and they have the same problem.
The CPU usage is 60% before I telnet them.
It fell to 20% when I using telnet to login. And raised to above 60% after logout.
This is the output of 'show proc cpu' when I login.
This is the output of 'show proc cpu' 2 mins later.
And the traffic chart will like this.
How can I to solve this problem?
The hardware & software version is:
WS-C2960S-48TS-L   12.2(53)SE1           C2960S-UNIVERSALK9-M
Many thanks for any comments.

Hi,

Check out the below link for troubleshooting high cpu in cisco 2960 switches hope to help !!

http://www.cisco.com/en/US/docs/switches/lan/catalyst3750/software/troubleshooting/cpu_util.html

Ganesh.H

[allen_huang]

Hi, Genash,

Thanks for your response.

But there is no matched conditions in our 2960S.

I have four 2960S and six 2960G on the same rack and connected to the same 3750-stack.

They have the same configuration.

But only 2960S got this problem.

Allen Huang

[Jayakrishna Mada]

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[mliu00002]

If you are running rancid, disable it. it cause high ssh process time on 2960

[Leo Laohoo]

WS-C2960S-48TS-L   12.2(53)SE1

Try 12.2(53)SE2.

[allen_huang]

Hi, leolaohoo,

Thanks for your response.

After upgrade one of them to 12.2(53)SE2.

Still the same situation.

CPU usage raised to 60% after boot completed.

It fell to 20% when I using telnet to login switch.

And raised back to 60% after logout.

[Jayakrishna Mada]

Allen,

Can you get "show proc cpu | e  0.00" and "show controller cpu-int" (couple of times) from the switch  when it is running high cpu.

Thanks.

JayaKrishna

[Viral Bhutta]

What happens when you console in to the switch.Does the cpu remain high? If yes then get show proc cpu | ex 0.00

[nelson.garcia]

Just going to throw this out here but if all of his switches are displaying the same symptom, high CPU usage, and that they are all connected to the 3750 stack, perhaps he's running some sort of process, STP, routing protocols, that are misconfigured and causing the high CPU usage.

[Viral Bhutta]

You might want to check this CSCth24278

[thomascollins]

We were seeing the same problem on our 2960s, and CSCth24278 was the culprit.  Cisco says it's a cosmetic bug that doesn't affect switch operations, though I have my doubts (we're seeing some performance problems that I suspect are high CPU related).  No fix yet -- eta March 2011!

[Leo Laohoo]

I'm currently running 12.5(55)SE on the 2960S.  I'm testing the same code on the 3750/3750E/3750X and so far so good.

[thomascollins]

Do you mean it fixed the high CPU?  Cisco TAC told me that high CPU (CSCth24278) was NOT fixed in 12.5(55)SE, but would be fixed in a release coming in 2011.

[vragotha]

CSCth24728 (http://tools.cisco.com/Support/BugToolKit/search/getBugDetails.do?method=fetchBugDetails&bugId=CSCth24278) is a cosmetic issue. It will be fixed in 12.2(58)SE

If this is impacting performance, then it is probably a different issue.