[c-nsp] High CPU caused by interupt on 7600 router

[Phil Mayers]

On 01/10/10 10:34, Rin wrote:

> PE-Router#sho proc cpu sort 5min
> CPU utilization for five seconds: 1%/1%; one minute: 3%; five minutes: 6%

The CPU is low at this point; you need to catch it when it's high.

>
> I followed the troubleshooting high CPU Utilization Guide but still cannot
> detect which kind of traffic is punted to CPU. Can anyone in the list show
> me the way how to detect which packets sending to CPU on 7609 router?

Have you tried this when it's high?

You could ERSPAN the RP/SP CPU to a remote machine, then correlate CPU 
spikes with the captured traffic.

Do you have any CoPP or MLS limiters enabled? I am thinking particularly 
the TTL and MTU ones.

How many BGP routes and peers do you have? What is the churn rate on the 
BGP table? Is there any IGP stability? Is there any possibility of a loop?