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

[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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