From: Annu Roopa (annu_roopa@xxxxxxxxx)
Date: Tue May 28 2002 - 18:15:51 GMT-3
Group,
This is my understanding.Whenever u create a EBGP peer
u generally do it with the neighbors peer address
which is the next hop serial link IP address. Now
since the peer relationship is being formed using ur
Loopback address u use "update-source" .U will use the
same command irespective of what interface u
use..other than serial IP.
Whenever u dont form a peer/neighbor relationship
using point-point link (with TTL=1)... it could be any
other IP address on the neighbor u need to use the
"ebgp-multihop". This works only with EBGP as i know.
Thus u may both being used togethter most of the
times.
HTH.
Annu
>From: "Paglia, John (USPC.PCT.Hopewell)"
<JPaglia@NA2.US.ML.com>
>Reply-To: "Paglia, John (USPC.PCT.Hopewell)"
<JPaglia@NA2.US.ML.com>
>To: "'Logan, Harold'" <loganh@mccfl.edu>, "Edward
Monk" <emonk@att.net>, ccielab@groupstudy.com
>Subject: RE: BGP Update-Source issue
>Date: Tue, 28 May 2002 16:28:56 -0400
>
>Isn't Update Source used only when configuring within
a single AS? What I
>understood from my reading (although I may have been
whacked from lack of
>sleep at the time) is that Update Source will have no
effect when
>configuring with reference to a router in another AS.
I do know that
>ebgp-multihop is necessary when pointint ot a
loopback from another AS.
>
>Am I way off on this one?
>
> > -----Original Message-----
> > From: Logan, Harold [SMTP:loganh@mccfl.edu]
> > Sent: Tuesday, May 28, 2002 12:50 PM
> > To: Edward Monk; ccielab@groupstudy.com
> > Subject: RE: BGP Update-Source issue
> >
> > When you set that up, what's the output of your
show ip bgp neighbors?
> > Remember, bgp networks won't show up in your
routing tables unless you
> > redistribute into bgp or use the network command.
If you've done that
> > already there are several other possibilities,
would you mind posting the
> > configs?
> >
> > > -----Original Message-----
> > > From: Edward Monk [mailto:emonk@att.net]
> > > Sent: Tuesday, May 28, 2002 12:16 PM
> > > To: ccielab@groupstudy.com
> > > Subject: BGP Update-Source issue
> > >
> > >
> > > I am trying to use loopbacks as the
update-source with BGP and cannot
> > > get the following to work. I have rebooted
etc....
> > >
> > >
> > >
> > > Both routers can ping the others loopback
address. Anyone
> > > have any idea
> > > what is wrong?
> > >
> > >
> > >
> > >
> > >
> > > R8:
> > >
> > >
> > >
> > > router bgp 500
> > >
> > > bgp log-neighbor-changes
> > >
> > > neighbor 10.10.10.7 remote-as 400
> > >
> > > neighbor 10.10.10.7 update-source Loopback0
> > >
> > >
> > >
> > > R7:
> > >
> > >
> > >
> > > router bgp 400
> > >
> > > bgp log-neighbor-changes
> > >
> > > neighbor 10.10.10.8 remote-as 500
> > >
> > > neighbor 10.10.10.8 update-source Loopback0
=====
Thanks in advance for ur time and replies.
Annu.
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