[96762] in North American Network Operators' Group
BGP announce/withdrawal history.
daemon@ATHENA.MIT.EDU (Forrest W. Christian)
Thu May 24 03:45:08 2007
Date: Thu, 24 May 2007 01:42:32 -0600
From: "Forrest W. Christian" <fwc@mt.net>
To: nanog@merit.edu
Errors-To: owner-nanog@merit.edu
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. Initially I figured this had to do with route flap amplification
or similar causing route dampening. However, when the circuit came back
up connectivity was almost immediately restored to the entire internet,
which doesn't seem consistant with a route flap dampening, unless the
timing was just coincidental.
This leads me to believe that the routes may have not been withdrawn for
the path through the second provider even though the circuit was down
for ~90 minutes. How this would have occured I have no idea.
At this point, I'm trying to reconstruct the state of the global routing
table in relation to my prefixes during this period. I seem to recall
at least historically that there was at least one or two places which
were capturing route announcement/withdrawl data on the internet.
However, google fails me. Is this data currently being captured
anywhere, and if so, is this data publically available (or at least are
the data "owners" willing to provide an extract for my prefixes)?
Any pointers would be helpful.
Thanks.
