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In-Reply-To: <465541E8.70001@mt.net> Cc: nanog@merit.edu From: Joe Abley <jabley@ca.afilias.info> Date: Thu, 24 May 2007 10:33:20 -0400 To: Forrest W.Christian <fwc@mt.net> Errors-To: owner-nanog@merit.edu On 24-May-2007, at 03:42, Forrest W. Christian wrote: > Earlier today I had an issue where a circuit to one of my two BGP > connected upstreams went away for an hour or so. > During this period, I expected BGP to act as expected and migrate > the traffic to the second circuit with a second provider. This did > not occur. When this has happened to me before, I have been suspicious about whether the upstream to whom the circuit broke was routing my nets down the dead circuit with static routes that for whatever reason (layer-2 obfuscation, etc) didn't go away when the link went down. This hasn't always been the answer, but sometimes it has; in several cases poking about within RIS (or interactively through a route-views router while the circuit was down) revealed that upstream in question was originating routes on my behalf while the circuit was down. Joe
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