From: William Chen (kwchen@netvigator.com)
Date: Sat Aug 07 2004 - 23:06:34 GMT-3
Hi Larry,
I think update-source is necessary, if you want to form the BGP peer
using loopback address. It is because, when BGP get reply from neighbor, it
will expected the source address of the reply is matching with the address
you set in the neighbor statement. It is impossible that the reply message
from the BGP peer use loopback as source address (it will use the outging
physical address as the source address for most time), unless you told the
router to do so (i.e. using the update-source command).
I will appreciate if you send us the configuration and also state which
IOS version you used.
HTH,
William
----- Original Message -----
From: "Larry Metzger" <larrymetzger@sbcglobal.net>
To: "Group Study" <ccielab@groupstudy.com>
Sent: Sunday, August 08, 2004 8:10 AM
Subject: BGP Update Source
> I am working on BGP configurations. I have Router1 (as100) and Router2
> (as200). I'm using the loopback on Router1 for the neighbor statement.
> The recommendation is to add "neigh R2 update-source loop0" I have
> configured these routers with and without the update source and
> everything works fine either way (sh ip bgp, sh ip bgp nei, sh tcp). Is
> it necessary? What problems will it cause if you don't change the
> update-source?
>
> Larry
>
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