[c-nsp] high cpu load not by processes

Phil Mayers p.mayers at imperial.ac.uk
Thu Feb 19 12:57:49 EST 2009

Mihai Todor wrote:
> Hello,
> Do you have any ideea on how to see what interrups are loading a router's
> CPU?

It is (tediously) difficult to break down interrupt CPU use.

The best approach is to SPAN the RP or SP CPU ports:


...and see if you're getting a lot of packets.

You can try doing:

sh ip traffic

...and comparing snapshots a few seconds apart to see if you're getting 
e.g. a lot of packets causing time-exceeded or ICMP unreachables.

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