High CPU Utilization in 7603 router with RSP720-10GE

[Alireza Karimi]

Hi everyone

We have a 7603 router with "RSP720-10GE" and we have high cpu utilization due to high amount of interrupts.

The output of “show cef drop” and “show ip cef switching statistics” commands show lots of packets that have been dropped by CEF.

But CEF is enabled on every physical interfaces and on every GRE tunnel that we have on this router.

As I understand the output of “show ip cef switching statistics” command shows some of the reasons for CEF dropping packets like “Routed to Null0” but I don’t know how to solve them. For example I can’t delete routes to Null0 because it’s going to cause routing loops in our network. Could you please help me

[Rajeev Sharma]

Hey,

The output shows high interrupt to CPU, So collect the last output multiple times to see if the DROP values are incrementing. Also configure NetDr captures to see what packets are punted to CPU. I am adding a link for same:

http://www.cisco.com/c/en/us/support/docs/switches/catalyst-6500-series-switches/116475-technote-product-00.html

HTH.

Regards,

RS