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 <j13park@hotmail.com> To: <nanog@merit.edu> CC: <smj@merit.edu>, <mohit@cs.ucla.edu> 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 ------------------------------------------------------------------------ e벗 사귀기, 쪽지 보내기, 가젯 즐기기를 통해 전세계 친구들을 만나세요! 나 의 글로벌 인맥, Windows Live Space! <http://www.spaces.live.com >