[91414] in North American Network Operators' Group
Re: Global Crossing Contact / BGP and SONET interaction question
daemon@ATHENA.MIT.EDU (Forrest W Christian)
Wed Jul 26 03:29:19 2006
Date: Wed, 26 Jul 2006 01:29:07 -0600
From: Forrest W Christian <fwc@mt.net>
To: Randy Epstein <repstein@chello.at>
Cc: nanog@merit.edu
In-Reply-To: <000601c6b076$6d6b0ec0$6401a8c0@D3M1BS91>
Errors-To: owner-nanog@merit.edu
Randy Epstein wrote:
> I don't have an answer to the root cause of your problem, and I'm not
> looking for a discussion on route dampening (there are enough debates
> onthis issue to make your head spin), but may I suggest you raise your
> hold timers to prevent your BGP sessions from going down on short
> disturbances as these?
From what I can tell the disturbances are less than a second in
duration. It doesn't appear that this is a hold-timer issue, although
I would like GX to set it at something higher than 90 seconds (mine is
already at a higher value- but the lower value wins during
negotiation). I really suspect that either a) GX has some semi-weird
configuration where the SONET ring switching from the normal to the
protect path and back causes BGP to reset on the border router I'm
attached to or b) There is a separate issue which is causing BGP to
flap. Or of course, something else completely different.
Unfortunately, I haven't been able to figure out how to talk to anyone
at GX which actually has access to the routers and knows anything about
BGP.
-forrest
