High CPU utilisation 3600 series

[charleslim2006]

Hi.

I had a problematice router will always hit cpu utilisation of 70% - 80%. is it normal for a router with series 3600 to encounter such issues and what is the best recommendated usage of a router cpu threshold? is there any official recommendation from cisco?

worry - lim

[spremkumar]

Hi

Can you try enabling ip route-cache flow and check based on the flow stats.

you can view the same using show ip cache flow which will give you the transactions happening and the source/destination ip address as well port numbers involved in transactions.

This will give you an idea about any irratic behavior happening with the traffic pattern and traffic being processed by the router..

The port numbers in the result will be displayed in Hex which you can decrypt the transactions and the traffic destined to specific ports...

regds

[Pavel Bykov]

can you please post running configuration of your router? It could be some complex functions that are run through HW, that are not really required for operation.

We had similar problems on Catalyst switches. Optimizing configuration reduced average switch load from 85 to 35 percent.

[charleslim2006]

Hi..all Cisco Expert.. thank for the help, in the meantime, we will to a higher version of the router to resolve this issues. cause it is confirm that it might be due to a lot of interruption in the route-cache that causes the cpu to shoot to that kinda of extended.

last but not least , i thank all the inputs and suggestion given.. really appreciated as networking was not a standalone job afterall..

cheers