[c-nsp] CEF Scanner eating CPU in Supervisor 720

[Peter Salanki]

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Yes, we are running MPLS. Does mac changes load CEF Scanner more when  
MPLS is enabled? I have a couple of /32s that are repeated a number  
of times in sh ip cef event. So probably caused by duplicate IPs or  
something like that, is there any aid for this other than trying to  
hunt down every broken customer.


8 jun 2006 kl. 19.40 skrev Rodney Dunn:

> Are you running MPLS on the box?
>
> Check the sh ip cef event outut and see if you have a /32 ADJ
> for a mac constantly changing. That's the most common trigger
> I've seen for the scanner running high.
>
> You are forcing CEF to constantly reresolve prefixes.
>
> Rodney
>
> On Thu, Jun 08, 2006 at 02:23:22PM +0200, Peter Salanki wrote:
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>> Hello,
>>
>> Process "CEF Scanner" is eating average 60% of the CPU on one of my
>> Sup720-3BXL. This leads to snmp responses being delayed and full BGP
>> updates taking a long time. I have not seen this on any of my other
>> sup720s. What differs this box from the rest is that this one has a
>> lot of directly connected hosts ~10 SVIs with 300 hosts each (on /23
>> subnets). I have tried setting arp timeout to 1200 on those SVIs,
>> which resulted in a small CPU utilization decrease. What can I do to
>> calm down the CEF Scanner? I'm running 12.2(18)SXF4.
>>
>> CPU utilization for five seconds: 44%/4%; one minute: 38%; five
>> minutes: 38%
>> PID Runtime(ms)   Invoked      uSecs   5Sec   1Min   5Min TTY Process
>> 119   103495040    719635     143819 35.40% 23.87% 21.54%   0 CEF
>> Scanner
>>
>> Sincerely
>>
>> Peter Salanki
>> Chief Network Engineer
>> Bahnhof AB (AS8473)
>> www.bahnhof.se
>> Office: +46855577132
>> Cell: +46709174932
>>
>>
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Sincerely

Peter Salanki
Chief Network Engineer
Bahnhof AB (AS8473)
www.bahnhof.se
Office: +46855577132
Cell: +46709174932


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