2013年6月30日星期日

BGP Flap?


Question:

II am pretty new to BGP and I Cisco 3560V2  just recently turned on logging for neighbor changes to troubleshoot problems.  I just noticed this today:

*Apr 12 12:41:31.514 CDT: %BGP-3-NOTIFICATION: received from neighbor x.x.x.x 6/6 (cease) 0 bytes
*Apr 12 12:41:31.514 CDT: %BGP-5-ADJCHANGE: neighbor x.x.x.x Down BGP protocol initialization
*Apr 12 12:41:41.744 CDT: %BGP-5-ADJCHANGE: neighbor x.x.x.xUp
*Apr 12 12:43:36.294 CDT: %BGP-3-NOTIFICATION: received from neighbor x.x.x.x 6/6 (cease) 0 bytes
*Apr 12 12:43:36.294 CDT: %BGP-5-ADJCHANGE: neighbor x.x.x.x Down BGP protocol initialization
*Apr 12 12:43:47.679 CDT: %BGP-5-ADJCHANGE: neighbor x.x.x.x Up
*Apr 12 12:46:34.697 CDT: %BGP-3-NOTIFICATION: received from neighbor x.x.x.x 6/6 (cease) 0 bytes
*Apr 12 12:46:34.697 CDT: %BGP-5-ADJCHANGE: neighbor x.x.x.x Down BGP protocol initialization
*Apr 12 12:46:41.847 CDT: %BGP-5-ADJCHANGE: neighbor x.x.x.x Up
*Apr 12 13:05:40.623 CDT: %BGP-5-ADJCHANGE: neighbor x.x.x.x7 Down Peer closed the session
*Apr 12 13:05:48.027 CDT: %BGP-5-ADJCHANGE: neighbor x.x.x.x Up
*Apr 12 13:06:35.655 CDT: %BGP-3-NOTIFICATION: received from neighbor x.x.x.x 6/6 (cease) 0 bytes
*Apr 12 13:06:35.655 CDT: %BGP-5-ADJCHANGE: neighbor x.x.x.x Down BGP protocol initialization
*Apr 12 13:06:43.379 CDT: %BGP-5-ADJCHANGE: neighbor x.x.x.x Up
*Apr 12 13:07:18.836 CDT: %BGP-5-ADJCHANGE: neighbor x.x.x.x Down Peer closed the session
*Apr 12 13:07:30.463 CDT: %BGP-5-ADJCHANGE: neighbor x.x.x.x Up

I looked up the 6/6 (cease) and I noticed that it is because of "configuration changes."  Would this be a config change at the next hop?  Thanks for any help!

Answer:

The router on the other side is sending this cease notification. This specific subcode is hard to interpret but is normally a sign that there is some kind of instability taking place on the peer router. If the router on the other side is yours, look at the log on that router to see what is going on. If it belongs to your SP, you need to contact them Cisco 3560X Price to find out what is going on.

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