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May 2005

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[Question] BGP update messages
by Shih Ming Tseng 19 May '05

19 May '05

Hi all, I have some questions regarding to BGP update messages. Please take a look at attached data. These are part of the update messages that Route Views received from peer router "81.209.156.1" related to prefix "152.211.164.0/23" for a 3-minute time period. My long-term observation is that 81.209.156.1 dropped all paths to 152.211.164.0/23. My questions are: 1. Why there were so many update messages with "INCOMPLETE" tag and router 81.209.156.1 kept sending exactly the same path to Route Views. ? 2 Assuming that router 81.209.156.1 sent an update to Route Views if and only if the best route was changed. From the data, it looks that the path was exactly the same. If the assumption were correct, why 81.209.156.1 kept sending update ? 3. Damping on router 81.209.156.1 should have dropped the path. It looks like the damping had nothing to do with those update messages. Any comment is appreciated. Thank you, Ming BGP4MP|1065917214|A|81.209.156.1|13237|152.211.164.0/23|13237 1239 701 816|INCOMPLETE|81.209.156.1|0|0|13237:44295|NAG|| BGP4MP|1065917214|A|81.209.156.1|13237|152.211.164.0/23|13237 1239 701 816|INCOMPLETE|81.209.156.1|0|0|13237:44295|NAG|| BGP4MP|1065917242|W|81.209.156.1|13237|152.211.164.0/23 BGP4MP|1065917362|A|81.209.156.1|13237|152.211.164.0/23|13237 1239 701 816|INCOMPLETE|81.209.156.1|0|0|13237:44295|NAG|| BGP4MP|1065917362|A|81.209.156.1|13237|152.211.164.0/23|13237 1239 701 816|INCOMPLETE|81.209.156.1|0|0|13237:44295|NAG|| BGP4MP|1065917362|A|81.209.156.1|13237|152.211.164.0/23|13237 1239 701 816|INCOMPLETE|81.209.156.1|0|0|13237:44295|NAG|| BGP4MP|1065917362|A|81.209.156.1|13237|152.211.164.0/23|13237 1239 701 816|INCOMPLETE|81.209.156.1|0|0|13237:44295|NAG|| BGP4MP|1065917362|A|81.209.156.1|13237|152.211.164.0/23|13237 1239 701 816|INCOMPLETE|81.209.156.1|0|0|13237:44295|NAG|| BGP4MP|1065917362|A|81.209.156.1|13237|152.211.164.0/23|13237 1239 701 816|INCOMPLETE|81.209.156.1|0|0|13237:44295|NAG|| BGP4MP|1065917362|A|81.209.156.1|13237|152.211.164.0/23|13237 1239 701 816|INCOMPLETE|81.209.156.1|0|0|13237:44295|NAG|| BGP4MP|1065917362|A|81.209.156.1|13237|152.211.164.0/23|13237 1239 701 816|INCOMPLETE|81.209.156.1|0|0|13237:44295|NAG|| BGP4MP|1065917362|A|81.209.156.1|13237|152.211.164.0/23|13237 1239 701 816|INCOMPLETE|81.209.156.1|0|0|13237:44295|NAG|| BGP4MP|1065917362|A|81.209.156.1|13237|152.211.164.0/23|13237 1239 701 816|INCOMPLETE|81.209.156.1|0|0|13237:44295|NAG|| BGP4MP|1065917362|A|81.209.156.1|13237|152.211.164.0/23|13237 1239 701 816|INCOMPLETE|81.209.156.1|0|0|13237:44295|NAG|| BGP4MP|1065917362|A|81.209.156.1|13237|152.211.164.0/23|13237 1239 701 816|INCOMPLETE|81.209.156.1|0|0|13237:44295|NAG|| BGP4MP|1065917362|A|81.209.156.1|13237|152.211.164.0/23|13237 1239 701 816|INCOMPLETE|81.209.156.1|0|0|13237:44295|NAG|| BGP4MP|1065917362|A|81.209.156.1|13237|152.211.164.0/23|13237 1239 701 816|INCOMPLETE|81.209.156.1|0|0|13237:44295|NAG|| BGP4MP|1065917362|A|81.209.156.1|13237|152.211.164.0/23|13237 1239 701 816|INCOMPLETE|81.209.156.1|0|0|13237:44295|NAG|| BGP4MP|1065917362|A|81.209.156.1|13237|152.211.164.0/23|13237 1239 701 816|INCOMPLETE|81.209.156.1|0|0|13237:44295|NAG|| BGP4MP|1065917362|A|81.209.156.1|13237|152.211.164.0/23|13237 1239 701 816|INCOMPLETE|81.209.156.1|0|0|13237:44295|NAG|| BGP4MP|1065917362|A|81.209.156.1|13237|152.211.164.0/23|13237 1239 701 816|INCOMPLETE|81.209.156.1|0|0|13237:44295|NAG|| BGP4MP|1065917362|A|81.209.156.1|13237|152.211.164.0/23|13237 1239 701 816|INCOMPLETE|81.209.156.1|0|0|13237:44295|NAG|| BGP4MP|1065917362|A|81.209.156.1|13237|152.211.164.0/23|13237 1239 701 816|INCOMPLETE|81.209.156.1|0|0|13237:44295|NAG|| BGP4MP|1065917363|A|81.209.156.1|13237|152.211.164.0/23|13237 1239 701 816|INCOMPLETE|81.209.156.1|0|0|13237:44295|NAG|| BGP4MP|1065917363|A|81.209.156.1|13237|152.211.164.0/23|13237 1239 701 816|INCOMPLETE|81.209.156.1|0|0|13237:44295|NAG|| BGP4MP|1065917364|A|81.209.156.1|13237|152.211.164.0/23|13237 1239 701 816|INCOMPLETE|81.209.156.1|0|0|13237:44295|NAG|| BGP4MP|1065917364|A|81.209.156.1|13237|152.211.164.0/23|13237 1239 701 816|INCOMPLETE|81.209.156.1|0|0|13237:44295|NAG|| BGP4MP|1065917364|A|81.209.156.1|13237|152.211.164.0/23|13237 1239 701 816|INCOMPLETE|81.209.156.1|0|0|13237:44295|NAG|| BGP4MP|1065917364|A|81.209.156.1|13237|152.211.164.0/23|13237 1239 701 816|INCOMPLETE|81.209.156.1|0|0|13237:44295|NAG|| BGP4MP|1065917364|A|81.209.156.1|13237|152.211.164.0/23|13237 1239 701 816|INCOMPLETE|81.209.156.1|0|0|13237:44295|NAG|| BGP4MP|1065917365|A|81.209.156.1|13237|152.211.164.0/23|13237 1239 701 816|INCOMPLETE|81.209.156.1|0|0|13237:44295|NAG|| BGP4MP|1065917365|A|81.209.156.1|13237|152.211.164.0/23|13237 1239 701 816|INCOMPLETE|81.209.156.1|0|0|13237:44295|NAG|| BGP4MP|1065917365|A|81.209.156.1|13237|152.211.164.0/23|13237 1239 701 816|INCOMPLETE|81.209.156.1|0|0|13237:44295|NAG|| BGP4MP|1065917366|A|81.209.156.1|13237|152.211.164.0/23|13237 1239 701 816|INCOMPLETE|81.209.156.1|0|0|13237:44295|NAG|| BGP4MP|1065917366|A|81.209.156.1|13237|152.211.164.0/23|13237 1239 701 816|INCOMPLETE|81.209.156.1|0|0|13237:44295|NAG|| BGP4MP|1065917367|A|81.209.156.1|13237|152.211.164.0/23|13237 1239 701 816|INCOMPLETE|81.209.156.1|0|0|13237:44295|NAG|| BGP4MP|1065917367|A|81.209.156.1|13237|152.211.164.0/23|13237 1239 701 816|INCOMPLETE|81.209.156.1|0|0|13237:44295|NAG|| BGP4MP|1065917367|A|81.209.156.1|13237|152.211.164.0/23|13237 1239 701 816|INCOMPLETE|81.209.156.1|0|0|13237:44295|NAG|| BGP4MP|1065917368|A|81.209.156.1|13237|152.211.164.0/23|13237 1239 701 816|INCOMPLETE|81.209.156.1|0|0|13237:44295|NAG|| BGP4MP|1065917368|A|81.209.156.1|13237|152.211.164.0/23|13237 1239 701 816|INCOMPLETE|81.209.156.1|0|0|13237:44295|NAG|| BGP4MP|1065917368|A|81.209.156.1|13237|152.211.164.0/23|13237 1239 701 816|INCOMPLETE|81.209.156.1|0|0|13237:44295|NAG|| BGP4MP|1065917369|A|81.209.156.1|13237|152.211.164.0/23|13237 1239 701 816|INCOMPLETE|81.209.156.1|0|0|13237:44295|NAG|| BGP4MP|1065917369|A|81.209.156.1|13237|152.211.164.0/23|13237 1239 701 816|INCOMPLETE|81.209.156.1|0|0|13237:44295|NAG|| BGP4MP|1065917370|A|81.209.156.1|13237|152.211.164.0/23|13237 1239 701 816|INCOMPLETE|81.209.156.1|0|0|13237:44295|NAG|| BGP4MP|1065917370|A|81.209.156.1|13237|152.211.164.0/23|13237 1239 701 816|INCOMPLETE|81.209.156.1|0|0|13237:44295|NAG|| BGP4MP|1065917370|A|81.209.156.1|13237|152.211.164.0/23|13237 1239 701 816|INCOMPLETE|81.209.156.1|0|0|13237:44295|NAG|| BGP4MP|1065917370|A|81.209.156.1|13237|152.211.164.0/23|13237 1239 701 816|INCOMPLETE|81.209.156.1|0|0|13237:44295|NAG|| BGP4MP|1065917371|A|81.209.156.1|13237|152.211.164.0/23|13237 1239 701 816|INCOMPLETE|81.209.156.1|0|0|13237:44295|NAG|| BGP4MP|1065917371|A|81.209.156.1|13237|152.211.164.0/23|13237 1239 701 816|INCOMPLETE|81.209.156.1|0|0|13237:44295|NAG|| BGP4MP|1065917372|A|81.209.156.1|13237|152.211.164.0/23|13237 1239 701 816|INCOMPLETE|81.209.156.1|0|0|13237:44295|NAG|| BGP4MP|1065917372|A|81.209.156.1|13237|152.211.164.0/23|13237 1239 701 816|INCOMPLETE|81.209.156.1|0|0|13237:44295|NAG|| BGP4MP|1065917372|A|81.209.156.1|13237|152.211.164.0/23|13237 1239 701 816|INCOMPLETE|81.209.156.1|0|0|13237:44295|NAG|| BGP4MP|1065917373|A|81.209.156.1|13237|152.211.164.0/23|13237 1239 701 816|INCOMPLETE|81.209.156.1|0|0|13237:44295|NAG|| BGP4MP|1065917373|A|81.209.156.1|13237|152.211.164.0/23|13237 1239 701 816|INCOMPLETE|81.209.156.1|0|0|13237:44295|NAG|| BGP4MP|1065917373|A|81.209.156.1|13237|152.211.164.0/23|13237 1239 701 816|INCOMPLETE|81.209.156.1|0|0|13237:44295|NAG|| BGP4MP|1065917373|A|81.209.156.1|13237|152.211.164.0/23|13237 1239 701 816|INCOMPLETE|81.209.156.1|0|0|13237:44295|NAG|| BGP4MP|1065917374|A|81.209.156.1|13237|152.211.164.0/23|13237 1239 701 816|INCOMPLETE|81.209.156.1|0|0|13237:44295|NAG|| BGP4MP|1065917374|A|81.209.156.1|13237|152.211.164.0/23|13237 1239 701 816|INCOMPLETE|81.209.156.1|0|0|13237:44295|NAG|| BGP4MP|1065917374|A|81.209.156.1|13237|152.211.164.0/23|13237 1239 701 816|INCOMPLETE|81.209.156.1|0|0|13237:44295|NAG|| BGP4MP|1065917374|A|81.209.156.1|13237|152.211.164.0/23|13237 1239 701 816|INCOMPLETE|81.209.156.1|0|0|13237:44295|NAG|| BGP4MP|1065917385|A|81.209.156.1|13237|152.211.164.0/23|13237 1239 701 816|INCOMPLETE|81.209.156.1|0|0|13237:44295|NAG|| BGP4MP|1065917385|W|81.209.156.1|13237|152.211.164.0/23

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