[c-nsp] NPE-G1 high CPU utilization due to 'BGP Router'

[Ben Steele]

None of your neighbors are flapping or at least their route tables?  
could be BGP RIB tables constantly being updated by unstable peer,  
check to see if any have excessive updates, is the router meshed with  
any others via iBGP? ie similar route tables, maybe compare memory  
consumption with a "sh proc mem | i BGP" and check the BGP Router's  
consumption against another iBGP peer.

I'd say the most likely cause is some routing instability either in  
your internal or external network though causing the BGP Router to  
process these updates.

Ben

On 21/02/2008, at 11:56 PM, Hauke Krull wrote:

> Hi,
>
> I've got several C7200VXR with NPE-G1 and IOS 12.4(17) running BGP.  
> On nearly
> all of these the CPU due to the process 'BGP Router' is below 4% -  
> even at an
> IX with about 230 peering sessions.
> But on one Router it is abnormaly high since some weeks:
>
> CPU utilization for five seconds: 34%/8%; one minute: 30%; five  
> minutes: 31%
> PID Runtime(ms)   Invoked      uSecs   5Sec   1Min   5Min TTY Process
> 183  1023798200 148554063       6891 24.96% 17.16% 18.50%   0 BGP  
> Router
>  41    78650604   9684235       8121  0.90%  0.92%  0.92%   0 Per- 
> Second Jobs
> 185    19365496 117660678        164  0.40%  0.46%  0.47%   0 BGP I/O
>  61    12146332 146022603         83  0.24%  0.21%  0.22%   0 IP Input
>
> This router has only 33 peering sessions, nothing relevant in the  
> logs, 1GB
> RAM.
> Only difference I'm seeing: On this router I'm useing an outbound as- 
> path
> filter-list together with a prefix-list instead of just a prefix- 
> list to an
> upstream.
>
> Now I'm searching for the cause of this high cpu utilization and am  
> hoping for
> some advice where to look next to narrow down th problem.
>
> Regards
> Hauke Krull
> -- 
> Dipl.-Phys. Hauke Krull
>
> NetUSE AG
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