From: Sue Joiner (no email)
Date: Sun Jan 13 2008 - 18:40:49 EST
Forwarding for Mohit Lad and Jonathan Park.
-sue
Sue Joiner
Merit Network
-------- Original Message --------
Subject: Unstable BGP Peerings?
Date: Sun, 13 Jan 2008 17:49:44 +0000
From: ParkJonathan <>
To: <>
CC: <>, <>
During our recent study on BGP routing instability, we found cases where
lots of routes changed from one subpath to another subpath, repeating this
kind of behavior over a few months . We do not know the cause of this
repeated instability, but suspect the BGP peering between routers in two
AS was unstable or had some problems and this caused routing changes seen
by many observation points.
Specifically, the peerings in question are
174 (Cogent) and 9121 (TTNet)
3257 (Tiscali) and 9121 (TTNet)
9304 (Hutchison) and 15412 (Flag Telecom)
1273 (Cable&Wireless) 4651 (Thai Gateway)
6762 (Seabone) and 7473 (Singapore Telecom)
For details of events and timings, please find a short summary on the
link below.
http://irl.cs.ucla.edu/pca/active-links.html
We would really appreciate if somebody from the ISPs involved in this
activity (or anybody who might know what happened) would contact us and
throw some light on the reasons for this behavior.
Thanks
Mohit Lad, Jonathan Park
UCLA
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