Re: High CPU Utilization

Would you pleasde share the actual configuration that causes the trouble ?
That would be enlightening, to me at least. I fail to imagine a scenario
that would cause a switch to trash in SPT.

-Carlos

Jezz Bird @ 22/01/2011 19:29 -0300 dixit:
> Hello,
>
> Thanks for your replies Guys.
>
> I have now worked out what the problem was: I had configured the native VLAN
> on the trunks as an unused VLAN to prevent VLAN hopping but I had not
> actually configured the VLAN on the switches at each end of the trunks. Once
> I did this the CPU utilization went right down:
>
> CPU utilization for five seconds: 6%/0%; one minute: 5%; five minutes: 5%
> PID Runtime(ms) Invoked uSecs 5Sec 1Min 5Min TTY Process
> 319 6250 1492 4189 0.47% 0.03% 0.18% 5 SSH
> Process
> 4 371297 32106 11564 0.47% 0.11% 0.11% 0 Check
> heaps
> 191 188562 442160 426 0.31% 0.08% 0.05% 0 IP
> Input
> 92 1081515 1783874 606 0.15% 0.01% 0.00% 0 hpm main
> process
> 5 74 1025 72 0.00% 0.00% 0.00% 0 Pool
> Manager
>
> The reason I configured it this way is that I had done so before but only
> between switches and ESX hosts without any issues.
>
> In this case the switch was performing fine: routing, spanning-tree etc. but
> obviously I was concerned about the high CPU usage.
>
> Thanks again for your replies
>
> Jezz
>
> On Sat, Jan 22, 2011 at 9:37 PM, <istong_at_stong.org> wrote:
>
>> Any spanning tree issues going on? What's the output from
>> show spanning, etc
>> Are you using vtp?
>>
>> Ian
>>
>>> Hello All,
>>>
>>> I am seeing very high CPU utilization on a stack of 2 x
>>> 3750s:
>>>
>>> CPU utilization for five seconds: 99%/14%; one minute: 99%
>>> ; five minutes: 99%
>>> PID Runtime(ms) Invoked uSecs 5Sec 1Min 5Min
>>> TTY Process
>>> 270 167303594 789523 211909 77.53% 79.32% 79.49%
>>> 0 VLAN Manager
>>>
>>> 200 1108075 875272 1265 0.62% 0.57% 0.56%
>>> 0 Spanning Tree
>>> 36 122992 4860 25306 0.46% 0.05% 0.00%
>>> 0 Per-minute Jobs
>>> 96 245844 341634 719 0.30% 0.11% 0.12%
>>> 0 hpm counter proc
>>> 4 360969 31240 11554 0.30% 0.13% 0.11%
>>> 0 Check heaps
>>>
>>> The VLAN Manager process appears to be the culprit using
>>> approx 79% - does anyone have any idea why this might be
>>> happening ?
>>>
>>> Thanks,
>>>
>>> Jezz
>>>
>>>
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-- 
Carlos G Mendioroz  <tron_at_huapi.ba.ar>  LW7 EQI  Argentina
Blogs and organic groups at http://www.ccie.net