08-14-2013 04:13 AM
Dears,
I'm facing problem in the CPU Utilization on Cisco 3750x, the below is the resault of "show process cpu sorted":
5Sec 1Min 5Min TTY Process
16.47% 16.93% 17.03% Hulc LED Process
how i can minimze the CPU Utilziation for this process. I'm using to SFP interface only.
This normal behavior or i can optimize that ?
the version on switch: c3750e-universalk9-mz.122-58.SE2.bin
Best Regards
Nadeem
08-14-2013 06:29 AM
Hello
I have the same problem with most of our 3750X
CPU utilization for five seconds: 44%/1%; one minute: 44%; five minutes: 44%
PID Runtime(ms) Invoked uSecs 5Sec 1Min 5Min TTY Process
179 367617815 42704985 8608 19.77% 19.58% 19.46% 0 Hulc LED Process
Soft is
Switch Ports Model SW Version SW Image
------ ----- ----- ---------- ----------
* 1 54 WS-C3750X-48P 15.0(2)SE4 C3750E-UNIVERSALK9-M
2 54 WS-C3750X-48P 15.0(2)SE4 C3750E-UNIVERSALK9-M
3 54 WS-C3750X-48P 15.0(2)SE4 C3750E-UNIVERSALK9-M
Best Regards
Darek
08-14-2013 07:22 AM
The Hulc LED process accounting for a fairly significant amount of switch CPU resources is not at all unusual. There are numerous threads here on CSC about this exact issue going back several years.
It has waxed and waned with varying IOS releases but has been around for at least four years. The conclusion that most folks come to is that it's normal behavior. (Sandeep's explanation here is the best one I've seen.) The LED process, among other things, is constantly scanning the ports' link status, system environment and other things and is pretty much the background workhorse on the switch.
Unless and until you have other process which, when added to the CPU load caused by the LED process, push your switch's CPU to the point of dropping traffic it is generally not an issue.
08-14-2013 03:54 PM
Hmmmmm ... 3750X ... with PoE.
If you are running PoE and/or 802.1x, it's best to AVOID 15.0. This means even the one you are running.
Consider 12.2(55)SE8. All my 3750 fleet are running this version and I have both PoE & 802.1x.
08-14-2013 10:37 PM
Thanks Marvin for your support.
yes Leo I'm using the POE because we have Telephony on our Network.
Best regards
Nadeem Saleem
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