A cisco 2960S 100% cpu

[stinutrixo]

hi

On a Cisco 2960S-48TS-L, After a Mac flapping the CPU went to 100 %  

700sw10_emb#sh proc cpu sort
CPU utilization for five seconds: 99%/5%; one minute: 99%; five minutes: 99%
 PID Runtime(ms)     Invoked      uSecs   5Sec   1Min   5Min TTY Process
 155    37771767     3603617      10481 23.51% 23.68% 23.53%   0 Hulc LED Proces
s
 225     4213295      956535       4404 23.31% 23.01% 22.98%   0 HULC DAI Proces
s
 234     3486099     1061257       3284 20.21% 20.41% 20.48%   0 IP Host Track P
r
 182     3761068      742168       5067 18.51% 18.40% 18.46%   0 Auth Manager

 104      244786     3413567         71  1.80%  1.57%  1.51%   0 HLFM address le

here is the log

Mar 13 17:43:38.076: %LINEPROTO-5-UPDOWN: Line protocol on Interface GigabitEthe
rnet1/0/29, changed state to up
Mar 14 08:05:25.076: %SW_MATM-4-MACFLAP_NOTIF: Host 000b.6b22.7b72 in vlan 1 is
flapping between port Gi1/0/48 and port Gi1/0/51
Mar 14 08:07:52.602: %SW_MATM-4-MACFLAP_NOTIF: Host 000b.6b22.7b72 in vlan 1 is
flapping between port Gi1/0/48 and port Gi1/0/51
Mar 14 08:09:16.681: %SW_MATM-4-MACFLAP_NOTIF: Host 000b.6b22.7b72 in vlan 1 is
flapping between port Gi1/0/48 and port Gi1/0/51
.Mar 14 08:38:10.808: %SW_MATM-4-MACFLAP_NOTIF: Host 000b.6b22.79de in vlan 1 is
 flapping between port Gi1/0/48 and port Gi1/0/51

The only solution is restart the switch

regards

[shine pothen]

look at the process

max is utlizaied by LED process.

can you tell us from when did you notice the spike in CPU.

[stinutrixo]

I saw it just after the last mac flapping. telnet and snmp connections doen't work.

But everything is ok on the second VLAN

regards

[Leo Laohoo]

I am not sure what IOS version you are using but here's my recommendation:  

1.  If you are running 12.2 then use 12.2(55)SE8; or

2.  If you are running 15.X then use 15.0(2)SE4.

Don't even bother using the others.