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High CPU Process on WS-C3750G

Unanswered Question
May 30th, 2012
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I have a process whick take all the CPU on two differents Stack of WS-C3750G in version 12.2.53(SE2):


XFRPALSN02R#sh proc cpu sorted
CPU utilization for five seconds: 97%/3%; one minute: 95%; five minutes: 95%
PID Runtime(ms)   Invoked      uSecs   5Sec   1Min   5Min TTY Process
307     5450059   4167397       1307 86.74% 83.63% 83.35%   0 hulc nrgyz PD di

XFRPALSN02R#sh proc cpu sorted
CPU utilization for five seconds: 96%/3%; one minute: 96%; five minutes: 96%
PID Runtime(ms)   Invoked      uSecs   5Sec   1Min   5Min TTY Process
307     7779608   5947379       1308 86.26% 85.75% 85.30%   0 hulc nrgyz PD di


Can you give me some explanations about this process.


Thanks

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Ivan Shirshin Wed, 05/30/2012 - 08:24
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  • Cisco Employee,

Hi,


This is EnergyWise PD discovery process. It looks like you are hitting the following bug:


CSCth62705    EnergyWise PD discovery process caused CPU high, fixed in 12.2(58)SE2


Symptom:

The switch experiences high CPU usage when new domain members or EnergyWise capable endpoints with a different EnergyWise domain are added to a existing domain and EtherChannel is configured.

Conditions:

A combination of cross domain traffic introduced via a endpoint or domain member and Etherchannel configuration between a access and distribution switch that has EnergyWise enabled at both ends is necessary to reproduce the problem.

Workaround:

The workaround would be to disable the port channel in the case where the high CPU usage is seen.


Here you can read more information on EnergyWise features:


http://www.cisco.com/en/US/prod/collateral/switches/ps5718/ps10195/white_paper_c11-568212.pdf


http://www.cisco.com/en/US/docs/switches/lan/energywise/phase1/ios/configuration/guide/configex.html


Kind Regards,

Ivan


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