[35359] in North American Network Operators' Group
Re: GSR and bgp maximum-paths
daemon@ATHENA.MIT.EDU (Rob Evans)
Wed Mar 7 13:44:34 2001
Date: Wed, 7 Mar 2001 18:39:49 +0000
From: Rob Evans <rhe@noc.ten-155.net>
To: James DeMong <James.DeMong@telus.com>
Cc: "'Nanog@Merit.Edu'" <Nanog@Merit.Edu>
Message-ID: <20010307183949.A22588@whit.ja.net>
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In-Reply-To: <23D5B89EC7B4D311821400805F85082C016AFE42@tac-nt6.ab.tac.net>; from James.DeMong@telus.com on Tue, Mar 06, 2001 at 09:19:16AM -0700
Errors-To: owner-nanog-outgoing@merit.edu
> Is anyone else have any problems with "maximum-paths" on a GSR and if yes,
> what release of IOS? Any other issues I should be aware of?
It may not affect you (given you are running 12.0(10)S), but having
maximum-paths set to something other than 1 can cause problems on
Engine 2 linecards. The result is that the CEF IPC Background
process eats all available linecard CPU. Packet forwarding is not
directly affected, but it can mean that the CEF tables take a long
time to converge after a routing flap.
As far as I am aware the bug was introduced around 12.0(13.6)S, and
has not been fixed in any releases so far.
However, this is starting to stray into cisco-nsp territory. :-)
Rob
