Hector Herrera wrote:
During a high network usage event, the cpu load increased to 90%
sustained, while a 'show processes cpu' did not reveal any culprits.
I suspected IP Input may be consuming a high amount of cpu, but it was
only at 2.7%
The 3550 is working as a L3 router with two static entries for the
default gw (for load balancing on our uplink).
Traffic levels at the time of the high cpu usage were ~120Mbps.
I also examined broadcast packet counts and traffic destined for the
router itself. They also did not reveal anything out of the ordinary.
Do you have any suggestions on what I should be looking at to
determine the source of the high cpu usage?
What did the topmost line in the "show processes cpu" say? At the five
second average you got two values; one is for interrupts and the other
is for process cpu usage. My guess is you was seing a lot of interrupts
which means traffic was punted to the CPU. Take a look at some of the
other threads on c-nsp to find out what kind of traffic was being punted
("show cef not-cef-switched" is a good start).
Hope this was helpfull
--
Harald Firing Karlsen
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