High CPU Utilization on CISCO switch

[Hemakumar Sampath]

ADDADF#show processes cpu sorted

CPU utilization for five seconds: 84%/0%; one minute: 74%; five minutes: 76%

PID Runtime(ms)   Invoked      uSecs   5Sec   1Min   5Min TTY Process

  36  16866406122007858316        840 59.07% 48.08% 50.55%   0 Cat4k Mgmt LoPri

  35   6076311842177929303          0 17.90% 18.60% 18.62%   0 Cat4k Mgmt HiPri

145    13056060   4525419       2885  1.99%  0.32%  0.27%   0 SpanTree Flush

Show logging

==========

017359: Aug  9 09:00:32.939 IST: %C4K_HWNETFLOWMAN-4-FLOWSLOSTERR: Netflow stats lost either due to hardware hash collisions or full hardware flow table. Stats lost for 3 packets.

show platform health

=================

K2FibAdjMan Stats Re   2.00   1.04     10     11  100  500    1   1    0  5026:14

K2FibAdjMan Host Mov   2.00  14.24     10     11  100  500   18  42   27  27542:31

K2FibAdjMan Adj Chan   2.00   0.00     10      1  100  500    0   0    0  0:00

K2FibMulticast Signa   2.00   0.00     10      3  100  500    0   0    0  418:40

[nkarpysh]

Hello,

Isee the host is moving:

K2FibAdjMan Host Mov 2.00 14.24

So it seems some MAc addresses flap between ports. You can enabled mac-move notification for every such move to be registered within log.

mac address-table notification mac-move

Please also use the following link for details 4500 CPU troubleshooting

http://www.cisco.com/en/US/customer/products/hw/switches/ps663/products_tech_note09186a00804cef15.shtml

Nik