[137852] in North American Network Operators' Group
BGP Failover Question
daemon@ATHENA.MIT.EDU (Chris Wallace)
Mon Feb 21 16:10:25 2011
From: Chris Wallace <lists@iamchriswallace.com>
Date: Mon, 21 Feb 2011 16:10:19 -0500
To: NANOG <nanog@nanog.org>
Errors-To: nanog-bounces+nanog.discuss=bloom-picayune.mit.edu@nanog.org
I am looking for some help with an issue we recently had with one of our =
BGP peers recently. I currently have two DIA providers each terminated =
into their own edge router and I am doing iBGP to exchange routes =
between the two edge routers. Last week Provider A made a policy change =
"somewhere" in their network in the middle of the day causing traffic to =
stop routing. Of course this connection happens to be the preferred =
route for the majority of our inbound and outbound traffic. I never saw =
our physical link go down and never saw our peer drop therefore BGP did =
not stop advertising routes, this caused most of our customers traffic =
to go nowhere. In order to fix the issue I had to manually shutdown the =
peer till Provider A confirmed the change they made had been reverted. =
This isn't the first time we have seen this issue with our various =
providers, how can I prevent issues like this from happening in the =
future?
---Chris=
