RE: peer in wrong AS

Did you try "debug ip bgp in" ?

here's a sample from my lab:

*Mar 1 00:06:40.223: BGP: 2.2.2.2 open active, local address 2.2.2.1
*Mar 1 00:06:40.295: BGP: 2.2.2.2 went from Active to OpenSent
*Mar 1 00:06:40.295: BGP: 2.2.2.2 sending OPEN, version 4, my as: 65510,
holdtime 180 seconds
*Mar 1 00:06:40.295: BGP: 2.2.2.2 rcv message type 1, length (excl. header)
26
*Mar 1 00:06:40.295: BGP: 2.2.2.2 rcv OPEN, version 4, holdtime 180 seconds
*Mar 1 00:06:40.295: BGP: 2.2.2.2 rcv OPEN w/ OPTION parameter len: 16
*Mar 1 00:06:40.295: BGP: 2.2.2.2 rcvd OPEN w/ optional parameter type 2
(Capability) len 6
*Mar 1 00:06:40.295: BGP: 2.2.2.2 OPEN has CAPABILITY code: 1, length 4
*Mar 1 00:06:40.295: BGP: 2.2.2.2 OPEN has MP_EXT CAP for afi/safi: 1/1
*Mar 1 00:06:40.295: BGP: 2.2.2.2 rcvd OPEN w/ optional parameter type 2
(Capability) len 2
*Mar 1 00:06:40.295: BGP: 2.2.2.2 OPEN has CAPABILITY code: 128, length 0
*Mar 1 00:06:40.295: BGP: 2.2.2.2 OPEN has ROUTE-REFRESH capability(old) for
all address-families
*Mar 1 00:06:40.295: BGP: 2.2.2.2 rcvd OPEN w/ optional parameter type 2
(Capability) len 2
*Mar 1 00:06:40.295: BGP: 2.2.2.2 OPEN has CAPABILITY code: 2, length 0
*Mar 1 00:06:40.295: BGP: 2.2.2.2 OPEN has ROUTE-REFRESH capability(new) for
all address-families
BGP: 2.2.2.2 rcvd OPEN w/ remote AS 65511 <----

Travis

> Date: Tue, 23 Jun 2009 21:37:37 +0000
> Subject: peer in wrong AS
> From: ccielight_at_gmail.com
> To: ccielab_at_groupstudy.com
>
> Hi Community,
>
> My question is about how to know (guess) which ASN is configured on the
peer
> side ( BB router : we suppose of course I don't have access to BB),
>
> the error message :
> *Jun 20 02:47:49.721: %BGP-3-NOTIFICATION: received from
> neighbor 12.12.10.254 2/2 (peer in wrong AS) 2 bytes 000C
>
> show the value 000C ( hexa ) which is number 12 , this is the ASN value on
> my router not on BB side.
>
>
> I tried "debug ip bgp" but cannot get any relevant information.
>
> Any help please ?
>
> Br //
>
> Maher
>
>
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Received on Tue Jun 23 2009 - 15:08:31 ART