[c-nsp] Cisco 7301 running at 99% CPU doing iBGP update

[jamie baddeley]

My Thanks to the folks who replied. 

We discovered the problem. Previously the EBGP peered router was running
on another AS. We'd removed that and replaced with a new AS. Clearly
this had caused issues. When it had got to the point of trying to
replace the IOS and discovering tftp was also running pig slow, we
reloaded the box and viola! iBGP is now updated with the global table in
40 seconds. That's much more like it.

Cheers

jamie

On Tue, 2006-06-27 at 14:42 -0400, Rodney Dunn wrote:
> Wonder if he's getting recursive next hops.
> 
> Make sure all your iBGP peers are next hop self.
> 
> On Tue, Jun 27, 2006 at 10:43:20AM -0700, Bruce Pinsky wrote:
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> > 
> > jamie baddeley wrote:
> > > Hi,
> > > 
> > > I've got a 7301 EBGP peered with International Transit, receiving the
> > > global table. It seems to recieve the updates OK, and after about 3
> > > minutes or so, is carrying the full table happily.
> > > 
> > > However, when I send that table onwards to an iBGP peer (another 7301),
> > > things get awful. CPU maxes out on both the eBGP peered router. Almost
> > > all of that is running the BGP process. 35 minutes later, and I'm only
> > > 144K pfxs recieved on the iBGP peer. Both are equipped with a gig of
> > > memory.
> > > 
> > > I'm somewhat surprised by this. Should I be? I've tried other platforms,
> > > and my trusty old 7206VXR had no problems sending the global table
> > > onwards to an iBGP peer.
> > > 
> > > Running c7301-p-mz.124-8.bin
> > > 
> > 
> > 
> > Check for output drops on the outbound interface and input drops on the
> > iBGP peer router causing retransmissions.  Also make sure there are no
> > physical errors that might also cause retransmissions.  Lastly, configure
> > path MTU discovery to make sure that you are using the largest packets
> > possible.
> > 
> > - --
> > =========
> > bep
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