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

[Bruce Pinsky]

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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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