[c-nsp] (BGP identifier wrong) error on majority of ebgp peers

[Minzhi (Catherine) Wu]

Seems it is a Cisco bug,

..following error message: %BGP-3-NOTIFICATION: sent to neighbor 1::1 passive 2/3 (BGP identifier wrong) 4 bytes 01000003 Conditions...Workaround: Enter the clear ip bgp command. *CSCsy29534...
06 Oct 2009 - www.cisco.com/en/US/docs/ios/12_2sr/release/notes/122SRcavs1.html

-----Original Message-----
From: cisco-nsp-bounces at puck.nether.net [mailto:cisco-nsp-bounces at puck.nether.net] On Behalf Of Andy Davidson
Sent: Friday, November 20, 2009 8:22 PM
To: cisco-nsp at puck.nether.net
Subject: [c-nsp] (BGP identifier wrong) error on majority of ebgp peers

Hi,

I have a Cisco 6509 with SUP720-3BXL.  It has over a hundred bgp peers
configured, two full tables, 4 ibgp, several peerings at an IXP.

Seemingly without a config change, there are some sessions which refuse to
establish, because of a bgp notification :

%BGP-3-NOTIFICATION: received from neighbor XXX 2/3 (BGP identifier wrong)
4 bytes XXX

The router-id has not been changed - it was using the address from Loopback
0.  The router-id *is* unique, and the remote side of the peering is using
a different address.

We tried modifying the local router-id to match an address used on a
point-to-point link and clearing all sessions - same error.

This router was loaded with SXF3, moved to SXF16, moved to SXI3 - same
error seen with all three.

We removed the router bgp xx config and pasted it back in - when the
sessions established the same error was noticed.

There appears to be no commonality (eg. linecard) between the sessions
which establish, and those which don't - for example, some over the shared
ixp link establish fine, and some do not due to this router-id clash
notification.

It is always the same sessions which either come up, or refuse to come up
each time.  The ibgp sessions always establish (fortunately).

Has anyone seen this before ?

Thanks
andy
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