K2AclCamMan Audit re ....4500 cpu peaks

Unanswered Question
Nov 8th, 2009

Hi Guys

I have 2 4506's that are running a collapsed core at a smaller site, one of my colleagues advised me that there were a significant number of cpu peaks of 60% or more, so I wanted to find out what was causing the peaks when the average cpu utilisation was only around 25%.

I started out with a show proc cpu history and sure enough the peaks were there, 5 second cpu bursts every 2 minutes, and even higher spikes of 80-90% every 4 hours (not sure of duration)

so just looking at the 60% issue, i did the following

Switch#show processes cpu

31 26534564 9274947 2860 43.19% 8.21% 6.95% 0 Cat4k Mgmt LoPri

this appeared to be the cause of the 60% 5 second bursts so following the cisco docs i then did a

Switch#show platform health

K2AclCamMan Audit re 1.00 42.70 10 5 100 500 0 0 0 16:48

and this little bugger appears to be the culprit of the 60% but for the life of me I cannot find any info as to what the process is or does....

breaking it apart...

Acl...access control list?

Cam...Cam table?

Man...Management?

Audit..ok.

re ....review?

is it auditing cam tables for aged entries??? auditing acl's?????

the next step in the process is Switch#show platform cpu packet statistics but i dont seem to get anything that stands out to me..

see attachments

hope someone can point me in the right direction....

cheers

Greg

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Giuseppe Larosa Sun, 11/08/2009 - 23:10

Hello Greg,

have a look at the following documents specific for C4500 platform

K2AclCamMan:

Manages the input and output TCAM hardware for QoS and security features

as explained in first link below

! high cpu usage

http://www.cisco.com/en/US/products/hw/switches/ps663/products_tech_note09186a00804cef15.shtml

! ACL and TCAM

http://www.cisco.com/en/US/products/hw/switches/ps663/products_tech_note09186a008054a499.shtml#subopt

! common issues

http://www.cisco.com/en/US/products/hw/switches/ps4324/products_tech_note09186a008063c36f.shtml#mymac

Hope to help

Giuseppe

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