High CPU on interrupt

[s.lachica]

Hi,

We have a setup of router serving as DHCP server to some VLANs and performing NAT at the same time. We are seeing about 95%/90% on the show proc cpu sort output. The device is ISR 1941 router. How can we determine the cause of the high CPU interrupt? We are suspecting due to the large number of ARP requests and DHCP requests but we have no proof.

Any inputs will be much appreciated.

Thanks,

Son

[Venkatesh Perumal]

refer below docs consists the basic troubleshooting approach for high CPU on Cisco routers. and let us know once you narrow down the issue to specific, as there could be multiple cause for high CPU.

http://www.cisco.com/c/en/us/support/docs/routers/10000-series-routers/15095-highcpu.html

https://supportforums.cisco.com/discussion/12080376/high-cpu-cisco1941

regards,

-Do rate helpful posts.

[Joseph W. Doherty]

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Posting

I don't know if there is a way to determine the breakout of interrupt CPU.

What's the aggregate volume of transit traffic during the high CPU?