Hello,

IP input is a generic process which handles process switching of packets. Normally, a 6500 should hardware switch all packets and therefore CPU would not go up.

In this case you had high amount of traffic being sent to the CPU for processing and making the processor run high.

We have a good feature called control plane policing which basically allows you to define a service policy to the control plane. This allows you to 'prioritise' and limit traffic coming into the processor and hence stop this happening again.

The site which explains it in more details is:

http://www.cisco.com/en/US/products/sw/iosswrel/ps1838/products_feature_guide09186a008052446b.html

I hope this helps.

Michael

Cisco TAC

Hi ,

i have got 99% CPU utilization on my distribution switche.

Switch_6509-E#show process cpu sorted
CPU utilization for five seconds: 99%/21%; one minute: 99%; five minutes: 99%
 PID Runtime(ms)   Invoked      uSecs   5Sec   1Min   5Min TTY Process
 564    79927284 129968237        614 49.16% 49.43% 49.23%   0 DHCPD Receive    
 276    32843180 185673510        176 21.66% 21.45% 21.61%   0 IP Input         
 502     1124192   5205617        215  1.27%  0.68%  0.64%   0 Port manager per

the process DHCPD Receive utilizing total 50% cpu..., after taking the netdr output i found 2 endpoint (voip phone) are culprit.

after removing those endpoint CPU is came to 6% and now switch is stable.

can someone please help me understand the Root cause of this issue.

Thanks!

RNS