Re: BGP AS-No.

From: ccie2006 ccie2006 (ccie2k7@yahoo.com)
Date: Sat Feb 24 2007 - 08:06:08 ART


i think there shouldn't be any need of this as the local-as command is just to
assist during the transition phase of a merger of two different BGP AS
----- Original Message ----
From: Digital Yemeni <digital-yemeni@hotmail.com>
To: ccielab@groupstudy.com
Sent: Saturday, February 24, 2007 1:47:00 PM
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
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