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

[Rodney Dunn]

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.
> 
> - --
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> bep
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