My customer has a 7206VXR Router which has been experiencing high cpu utilization (90%)
When I do a show process cpu, the individual processes dont add upto anywhere near 90% at all. Can anybody help explain why is it showing such output as it is very difficult to identify a corrupt or hogging process from this.
Also a few tips on troubleshooting high cpu would prove useful to me.
High CPU usually occurs when a large number of packets are punted out of the fast switching path (CEF) and into process switching (CPU). When the IP_Input process is unusually high this is a sign of excessive process switching.
As a start, use 'show interface statistics' to see how many packets each interface is process switching versus fast switching.
Also, make sure there is no debugging enabled. 'undebug all'.
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