[139006] in North American Network Operators' Group
Question about AS Origin changes
daemon@ATHENA.MIT.EDU (Yaoqing(Joey) Liu)
Thu Mar 24 23:25:43 2011
Date: Thu, 24 Mar 2011 22:24:53 -0500
From: "Yaoqing(Joey) Liu" <joey.liuyq@gmail.com>
To: nanog@nanog.org
Errors-To: nanog-bounces+nanog.discuss=bloom-picayune.mit.edu@nanog.org
Hi NANOG list,
I am wondering if anyone can give me possible reasons for some uncommon BGP
origin change activity. What we see is that sometimes the origin for a
prefix seems to change from a customer AS to it upstream provider and back.
In many instances the prefix simply switches back and forth for hours or
even days and sometimes very rapidly . Below I=92m including an example of
some of the activities I see.
Prefix 202.83.96/20 on border router 154.11.98.225(AS 852)
At 14:10:56 Dec 04 2010, the BGP path with AS18106 as the origin
At 14:11:57, the BGP path with AS9255 as the origin
At 14:14:27, the BGP path with AS18106 as the origin.
Thanks,
Yaoqing
