24 Mar
2011
24 Mar
'11
11:24 p.m.
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’m 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