[c-nsp] BGP scanner taking up CPU

[Joris de Mooij]

Thanks for the input guys...

Grtz
Joris 

-----Original Message-----
From: Rodney Dunn [mailto:rodunn at cisco.com] 
Sent: vrijdag 11 augustus 2006 15:03
To: Marian Durkovic
Cc: Oliver Boehmer (oboehmer); cisco-nsp at puck.nether.net; Joris de Mooij
Subject: Re: [c-nsp] BGP scanner taking up CPU

It would be interesting for someone to compare the scanner CPU usage
when they upgrade to 12.2(33)SRA that has the fix for:

CSCef51906
BGP: reduce CPU impact of scanner

which is an internal enhancement we made to reduce the work the scanner
has to do.

Rodney

On Fri, Aug 11, 2006 at 02:56:20PM +0200, Marian Durkovic wrote:
> On Fri, Aug 11, 2006 at 02:35:27PM +0200, Oliver Boehmer (oboehmer)
wrote:
> > Joris de Mooij <> wrote on Friday, August 11, 2006 2:11 PM:
> > 
> > > Hi all,
> > > 
> > > We have a 6506 with Sup720-MSFC2 running IOS 12.2(18)SXD5. This 
> > > router holds the entire internet BGP table. Now we are suspecting 
> > > the BGP scanner process for causing temporary high CPU loads. 
> > > Because this process runs with a high priority, exec commands, 
> > > pings and snmp seem no to get through anymore. When using the vty 
> > > exec, output seem to stall for 1 to 3 seconds at least every
minute.
> > 
> > BGP Scanner is a low-priority process (check "show proc <pid>"), it 
> > should not have that adverse effects. Maybe something else is going
on.
> 
> Actually, those problems with BGP Scanner seem to be 6500-specific. 
> During BGP Scanner runs the box stops processing the CPU-switched 
> packets and the SPD queue on the RP owerflows - thus the SNMP, telnet 
> (but even e.g. software switched multicast) packets get dropped and
"SPD flushes"
> counters increment in jumps.
> 
> When SPD is disabled, the box runs much more smoothly, however manual 
> tuning of input hold-queues is needed for BGP etc.
> 
> 
> 	With kind regards,
> 
> 		M.  
> 
>
------------------------------------------------------------------------
--
> ----
----
> ----   Marian Durkovic                       network  manager
----
> ----
----
> ----   Slovak Technical University           Tel: +421 2 524 51 301
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> ----   Computer Centre, Nam. Slobody 17      Fax: +421 2 524 94 351
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> ----   812 43 Bratislava, Slovak Republic    E-mail/sip: md at bts.sk
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