From: Edison Ortiz (edisonmortiz@gmail.com)
Date: Sat Feb 24 2007 - 12:29:37 ART
conf t
Enter configuration commands, one per line. End with CNTL/Z.
R2(config)#router bgp 100
R2(config-router)#neighbor 183.1.254.1 remote-as 200
conf t
Enter configuration commands, one per line. End with CNTL/Z.
R1(config)#router bgp 200
R1(config-router)#neigh 183.1.254.2 remote-as 500
On R2
%BGP-3-NOTIFICATION: sent to neighbor 183.1.254.2 2/2 (peer in wrong AS) 2
bytes 0064 FFFF FFFF FFFF FFFF FFFF FFFF FFFF FFFF 002D 0104 0064 00B4 9601
0202 1002 0601 0400 0100 0102 0280 0002 0202 00
Above message says "(peer in wrong AS) 2 bytes 0064"
0064 is a hex value corresponding to 100. It's saying 183.1.254.2 is on
AS100 not AS500.
If you go to R2, you will see this message as well
%BGP-3-NOTIFICATION: received from neighbor 183.1.254.1 2/2 (peer in wrong
AS) 2 bytes 0064
----- Original Message -----
From: "Digital Yemeni" <digital-yemeni@hotmail.com>
To: <ccielab@groupstudy.com>
Sent: Saturday, February 24, 2007 5:47 AM
Subject: BGP AS-No.
> Hi Guys,
>
> Someone has asked me if the following scenario is "Solvable"
>
> R1 (IP:1.1.1.1)
> ----------------------
> router bgp 100
> neighbor 2.2.2.2 remote-as 200
>
>
>
> R2 (IP:2.2.2.2)
> ----------------------
> router bgp 200
> neighbor 1.1.1.1 remote-as 500 <---(intentional-mistake!)
>
>
> Assuming that R1 does not know what the AS# that was configured on R2 -
> (if R1 knows then it can use the "neighbor 2.2.2.2 local-as 500" command
> to resolve the problem) - how can you figure out what AS# was configured
> on R2 so u can establish relationship?
> Note: "debug ip bgp detail" won't show you that!
>
>
> I tried to see IF the "wrong AS# 500" shows up in any of the
> communications debugs between R1 and R2 when they hardly try to establish
> the relationshops but i could not succeed!! Is it really possible to
> detect what AS# the remote router has configured for our router?
>
>
> Best Regards,
>
> Digital
> ------------------------------------------------------------------------------------------------------------------
>
>
> ***********************************************************************************
> *.* You'll NEVER succeed as a "CCIE" until you LOVE Cisco MORE than your
> sleep! *.*
> ***********************************************************************************
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> that a bit. Therefore, please be concise on your email. Thank you!
>
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This archive was generated by hypermail 2.1.4 : Thu Mar 01 2007 - 07:38:48 ART