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Cisco switch WS-C3750X-48T cpu utilization issue

Hi All,

I have a cisco switch WS-C3750X-48T .I have a issue that of cpu utilization .please suggest the reason why  the switch is behaving like this and what is the solution .

Please find the log as mention below.

UG-GW-CORE#sh proc cpu | e 0.00

CPU utilization for five seconds: 34%/1%; one minute: 36%; five minutes: 36%

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

  10      833688   1686490        494  0.31%  0.71%  0.63%   0 ARP Input

  69      144766     30391       4763  0.15%  0.13%  0.11%   0 Compute load avg

  74     4470389    735065       6081  2.86%  2.75%  2.77%   0 RedEarth Tx Mana

  80     1068811     60462      17677  0.79%  0.70%  0.65%   0 Adjust Regions

116     2567337    295705       8682  1.58%  1.55%  1.56%   0 hpm counter proc

156    24497604   2908539       8422 15.57% 14.80% 14.65%   0 Hulc LED Process

167      546741     30415      17976  0.31%  0.31%  0.31%   0 HQM Stack Proces

198      604538   1052522        574  0.31%  0.58%  0.55%   0 IP Input

217     8967911   1674951       5354  6.04%  5.16%  5.23%   0 Spanning Tree


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Cisco switch WS-C3750X-48T cpu utilization issue

This issue can be due to Hulc LED Process:


Hulc LED Process - Is responsible for link status detection.

Symptom:

Hulc LED Process uses 15-30% CPU on Catalyst 3560X/3750X platforms.

Conditions:

The is seen in 12.2(53)SE releases or later.

Workaround:

This is an expected behavior and there is no workaround.

Further Problem Description:

The "Hulc LED" process does following tasks:

- Check Link status on every port
- If the switch supports POE, it checks to see if there is a Power Device (PD) detected
- Check the status of the transceiver
- Update Fan status
- Set Main LED and ports LEDs
- Update both Power Supplies and RPS
- Check on system temperature status

Bug details at :

http://tools.cisco.com/Support/BugToolKit/search/getBugDetails.do?method=fetchBugDetails&bugId=CSCtn4279

Hence, this is expected behavior and you should not worry about it. As per what I can see your switch has a 34% of cpu usage which should not cause any issues, it is normal.

Most of the IOS images on this platform have this bug, and even if you upgrade you might see the same issue again.

So as a workaround to reduce the CPU consumption of this process, go ahead and shut down all unused interfaces, and it might bring down the CPU consumed due to HULC LED little bit.

The High CPU consumption because of HULC LED process won't imact your network at all.

Hope this helps, and remember to rate any useful posts.

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