It is expected to have something like 30% SP CPU due to the diagnostics tests
that run on the LCs.
Excessive SP CPU usage is typically related to Layer 2 operations like STP,
IGMP and LACP.
But another root cause of SP CPU running wild can be HSRP on multiple SVIs. If
this applies - have You set priority? Do You use preempt?
Applied "no ip proxy-arp" on SVIs? "no ip redirects"?
You may also try to disable the diagnostic monitoring of LCs and verify
switch(config)#no diagnostic monitor module all
switch#remote command switch show proc cpu hi
cisco-nsp mailing list firstname.lastname@example.org
archive at http://puck.nether.net/pipermail/cisco-nsp/