High CPU on router

[cisco.ccnapie1]

Hello, 

I have got an issue with one of my routers having high CPU. Could someone please guide me in troubleshooting high CPU. What I should be checking on the router and what could be the cause of high CPU. 

Thanks

[Nikhil Kapoor · Accepted solution]

Hi, 

There could be many reasons for high CPU. For high CPU on the router it could be process causing the high CPU or traffic (interrupts). Therefore first thing is to check if the CPU is being caused by some process or it is interrupts. 

Few checks that you could quickly do on the router. 
1. Show proc cpu sorted 5sec | ex 0.00 << This will confirm if there is process involved or interrupt.
2. Show stacks >> Any recent crash happened
3. Show ip traffic >> Any high amount of traffic which you think causing the issues. 
4. Check if there is any debug running on the router. 
5. Show interface switching >> Check if the how packets are being process. 

Below document would be helpful in isolating the issue. 

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

HTH,
Nikhil 

[cisco.ccnapie1]

Thanks  I checked and it was some debug logs on router.
 

[Leo Laohoo]

Post the output to the command "sh proc cpu sorted | ex 0.00".