does debug ip OSPF adjacency will cause high CPU

[thiyagarajankalaiselvan]

Hello All,

We are finding a OSPF flapping issue on Cisco 3750x switches. To isolate the issue TAC has suggested "debug ip ospf adj"

Does this command will cause high CPU utilization?

There are 12 OSPF neighbours connected to that switch and we have the hello interval of 1 second.

Any of your help would be appreciable.

Regards,

Thiyagu

[Bilal Nawaz]

It may do... But unlikely. There is always a risk with debug commands that have large output. Especially that you have hello intervals set to 1 second. I would advise to do out of hours if necessary to mitigate risks of impacting production. What version of ios are you on and show the output of 'show proc cpu sorted' I have had a similar experience and multicast was the problem. It was high CPU and dropping ospf adjacencies. We downgraded to 12.2 55 SE 8 It helped the problem for CPU utilisation but didn't fix it. Since then we are using 6509Es in VSS