High CPU Process on WS-C3750G

[vpatrick]

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

[Danilo Dy]

http://www.cisco.com/en/US/products/hw/switches/ps5023/products_tech_note09186a00807213f5.shtml

Search for hulc

[Ivan Shirshin]

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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