I have a 6509 that the CPU usage spikes on every 15 seconds or so. The kernel process goes up to nearly 100% then drops back down to it's baseline 20%. The switch is currently only servicing 6 x 4900M switches, 2 blade switches and 2 san switches.
The traffic flow through the switch is well below capacity, and I cannot see any misconfigurations on the device. Spanning tree, VTP, etherchannel and all other configuration looks to be working ok. Nothing is generated in the logs, no flapping interfaces, etc.
The only misconfiguration I can see is in sh ver:
'Patching is not available since the system is not running from an installed image. To install please use the "install file" command.'
I think this is due to the 'install bind sup-bootflash:/sys' command not being applied as the image already exists and is booting from the sup-bootflash. I doubt this would cause the kind of CPU spike I am seeing, though..
I have already been through the 6500 guide linked below for diagnosing this problem and have found nothing relevant.
Can anyone give me a pointer or 2 on where to go next?
Please let me know if you need any further information or output from the device.
Thanks in advance.