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High CPU usage on WS-C4503 switch

Unanswered Question
Sep 18th, 2013
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Hello,


We are facing High CPU usage on one of our Cisco WS-C4503 switch. Below are the details of troubleshooting done so far.


  • CPU is high since last 4 days continuosly at around 80%.
  • No configuration changes done on this switch since last 2 months.
  • 'show proc cpu | ex 0.00' shows follwing:


CPU utilization for five seconds: 82%/12%; one minute: 85%; five minutes: 84%

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

5 123813968 21267941 5821 0.07% 0.09% 0.06% 0 Check heaps

18 78283824 525816929 148 0.07% 0.05% 0.06% 0 ARP Input

29 15653926804247055113 368 2.07% 2.09% 2.07% 0 Cat4k Mgmt HiPri

30 19606539603324989972 589 66.95% 70.39% 69.14% 0 Cat4k Mgmt LoPri

49 19054536 771244767 24 0.31% 0.26% 0.26% 0 Spanning Tree

55 878251841188637774 73 0.07% 0.04% 0.02% 0 IP Input

57 3533592 278116997 12 0.07% 0.05% 0.05% 0 CDP Protocol

85 11427508 484514562 23 0.07% 0.05% 0.05% 0 HSRP (Standby)


  • 'show platform health' output show following process using high CPU:


K2CpuMan Review 30.00 61.35 30 27 100 500 105 66 92 2031101:03


  • 'show platform cpu packet statistics' shows the following important details.


Packets Received by Packet Queue

Queue Total 5 sec avg 1 min avg 5 min avg 1 hour avg
---------------------- --------------- --------- --------- --------- ----------
Esmp 9896088557 83 77 63 53
Control 257381732 1 0 0 0
Host Learning 35793135 0 0 0 0
L3 Fwd Low 5969363 0 0 0 0
L2 Fwd Low 1044827476 2 0 1 2
L3 Rx Low 271999128 4 0 0 0
RPF Failure 141 0 0 0 0
ACL fwd(snooping) 2434588515 26 16 13 5
ACL log, unreach 726996875089 4656 3791 2245 11232
ACL sw processing 11 0 0 0 0

Packets Dropped by Packet Queue

Queue Total 5 sec avg 1 min avg 5 min avg 1 hour avg
---------------------- --------------- --------- --------- --------- ----------
Host Learning 1214 0 0 0 0
ACL log, unreach 4021191190 0 0 10 469


Based on the outputs above, I have checked & found that there are no ACL with 'log' keyword configured. Need your suggestions to troubleshoot & identify root cause for this issue along with possible resolution.


Please do revert for any further clarifications. Thanks in advance for your support.


Regards,

Nitin


Message was edited by: Nitin Saraswat

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wipronitin Wed, 09/18/2013 - 22:36
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Hello,


I am not able to access the link provided by you.


Also, I have already tried troubleshooting this using the Cisco document for high cpu usage on 4500 series switches.


As already mentioned earlier, as per that document the hig cpu is realted to ACL log, unreach packets. However i checked the ACL on the switch & there is not statement with log keyword.


Do revert for any clarifications.


Regards,

Nitin

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