[c-nsp] Stranges with BGP

[Alexey Luckyanchikov]

Hi.

Today I observed strange flapping between two 7513. Log from one side
(software version - 12.2(14)S9):
Dec 10 23:05:24: %BGP-5-ADJCHANGE: neighbor 195.248.160.210 Up
Dec 13 11:39:59: %BGP-5-ADJCHANGE: neighbor 195.248.160.210 Down BGP Notification sent
Dec 13 11:39:59: %BGP-3-NOTIFICATION: sent to neighbor 195.248.160.210 1/2 (illegal header length) 0 bytes
Dec 13 11:40:29: %BGP-5-ADJCHANGE: neighbor 195.248.160.210 Up
Dec 13 11:40:29: %BGP-5-ADJCHANGE: neighbor 195.248.160.210 Down BGP Notification sent
Dec 13 11:40:29: %BGP-3-NOTIFICATION: sent to neighbor 195.248.160.210 3/1 (update malformed) 31 bytes CA1A5B12 83000000 00D456E5 B1D45646 F5
Dec 13 11:40:29: BGP: 195.248.160.210 Bad attributes FFFF FFFF FFFF FFFF FFFF FFFF FFFF FFFF 0073 0200 0000 4540 0101 0240 0204 0201 21F2 4003 04C3 F8BF 9680 0404 0000 0000 4005 0400 0000 5AC0 0804 EC17 BDBA CA1A 5B12 8300 0000 00D4 56E5 B1D4 5646 F5D4 56
Dec 13 11:40:55: %BGP-5-ADJCHANGE: neighbor 195.248.160.210 Up
Dec 13 11:43:56: %BGP-5-ADJCHANGE: neighbor 195.248.160.210 Down BGP Notification sent
Dec 13 11:43:56: %BGP-3-NOTIFICATION: sent to neighbor 195.248.160.210 4/0 (hold time expired) 0 bytes
Dec 13 11:44:24: %BGP-5-ADJCHANGE: neighbor 195.248.160.210 Up
Dec 13 12:08:05: %BGP-5-ADJCHANGE: neighbor 195.248.160.210 Down BGP Notification sent
Dec 13 12:08:05: %BGP-3-NOTIFICATION: sent to neighbor 195.248.160.210 1/2 (illegal header length) 0 bytes

And from another (software version - 12.2(14)S10):
Dec 13 11:39:59: %BGP-3-NOTIFICATION: received from neighbor 195.248.160.167 1/2 (illegal header length) 0 bytes
Dec 13 11:39:59: %BGP-5-ADJCHANGE: neighbor 195.248.160.167 Down BGP Notification received
Dec 13 11:40:29: %BGP-5-ADJCHANGE: neighbor 195.248.160.167 Up
Dec 13 11:40:29: %BGP-3-NOTIFICATION: received from neighbor 195.248.160.167 3/1 (update malformed) 31 bytes CA1A5B12 83000000 00D456E5 B1D45646 F5
Dec 13 11:40:29: %BGP-5-ADJCHANGE: neighbor 195.248.160.167 Down BGP Notification received
Dec 13 11:40:55: %BGP-5-ADJCHANGE: neighbor 195.248.160.167 Up
Dec 13 11:43:56: %BGP-3-NOTIFICATION: received from neighbor 195.248.160.167 4/0 (hold time expired) 0 bytes
Dec 13 11:43:56: %BGP-5-ADJCHANGE: neighbor 195.248.160.167 Down BGP Notification received
Dec 13 11:44:24: %BGP-5-ADJCHANGE: neighbor 195.248.160.167 Up
Dec 13 12:08:05: %BGP-3-NOTIFICATION: received from neighbor 195.248.160.167 1/2 (illegal header length) 0 bytes
Dec 13 12:08:05: %BGP-5-ADJCHANGE: neighbor 195.248.160.167 Down BGP Notification received
Dec 13 12:08:35: %BGP-5-ADJCHANGE: neighbor 195.248.160.167 Up

Manual session reset help - flapping stopped. I can't find any
appropriate to this issue in Bug Navigator. Do you have any ideas about
what it was?

-- 
Sincerely,
Alexey Luckyanchikov