From: allboutcisco (frenzeus@streamyx.com)
Date: Tue May 09 2006 - 06:59:53 ART
Hi group,
Has anyone ever experienced BGP neighbor formation, where the states of one end is in OPENSENT while the remote end is OPENCONFIRM?
Initially the neighbor state at both ends reaches ESTABLISHED state, but after about 2min+ a notification is sent by one of them, thereby closing the connection:
(154.1.0.3 ---- 154.1.0.5)
%BGP-3-NOTIFICATION: sent to neighbor 154.1.0.3 4/0 (hold time expired) 0 bytes
I did a further debug ip bgp & debug ip tcp transactions, noticed that from the debug output, all BGP capabilities were negotiated properly from the receipt of the OPEN message, however one of the routers is reporting tcp bad segment. All else is at it's default, no acl, no change of tcp mss size or whatsoever at both routers interface.
The following is part of the debug i collected:
TCP0: bad seg from 154.1.0.5 -- outside window: port 179 seq 2431366053 ack 3476515037 rcvnxt 2431366098 rcvwnd 16339 len 45
154.1.0.3:179 <---> 154.1.0.5:17043 congestion window changes
cwnd from 1461 to 1460, ssthresh from 65535 to 2920
TCP0: timeout #1 - timeout is 3674 ms, seq 3476515037
TCP: (179) -> 154.1.0.5(17043)
TCP0: timeout #2 - timeout is 7348 ms, seq 3476515037
TCP: (179) -> 154.1.0.5(17043)
TCP0: Data repacketized, seq 3526658343, sent 298 byte
U might need to repaste onto notepad.
Any ideas? BGP neighbor is not forming..
Thanks.
Kenny
This archive was generated by hypermail 2.1.4 : Thu Jun 01 2006 - 06:33:21 ART