High CPU Utilization in WS-C6509-E with SUP 720 running IOS s72033_rp-IPSERVICESK9_WAN-M

[shanfrancis]

Hi Team,

We are seeing high CPU utilization on one of our Core Switch (WS-C6509-E with SUP 720 running IOS s72033_rp-IPSERVICESK9_WAN-M).

See the output captured for CPU utilization and see ~50% of CPU is used for ARP Input.

Request experts to help here.

c1#sh proc cpu sort
CPU utilization for five seconds: 98%/23%; one minute: 98%; five minutes: 97%
PID Runtime(ms) Invoked uSecs 5Sec 1Min 5Min TTY Process
11 341378540 344648927 990 53.19% 48.92% 47.74% 0 ARP Input
262 6230554362922673118 0 8.71% 9.29% 9.34% 0 IP Input
455 1612284152 517644018 3114 2.63% 1.67% 1.59% 0 Port manager per

[Mark Malone]

Theres multiple reasons you could be arping that high mostly because your punting to the cpu

Theres a few things you can check in this doc regarding configuration and identifying what might be the cause of this.

https://supportforums.cisco.com/document/59926/troubleshooting-high-cpu-6500-sup720

Has it only started happening or have you been running high for a while? any new config introduced

[shanfrancis]

Thank you Mark for quick response !!!

Started seeing this from today morning.

Will check the URL provided and revert with updates.