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Re: BGP announce/withdrawal history.

  • From: Joe Abley
  • Date: Thu May 24 10:36:37 2007


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