From: MADMAN (dave@xxxxxxxxxxxxxx)
Date: Wed May 29 2002 - 14:40:20 GMT-3
Yes that how it works. Try configuring a BGP with you neighbor as the
serial using the update source loop command and you will see the TCP
connection will not be established which of coarse keeps BGP in the
ACTIVE state.
dave
"Logan, Harold" wrote:
>
> To get a BGP session to work using a loopback as the update source, I've had
to use the remote router's loopback IP in the neighbor command. That is, if you
use update-source Lo0 on a router, then that router's BGP peer needs to use th
e IP address of the Lo0 interface in its neighbor command. Anyone else run into
that?
>
> Hal
>
> > -----Original Message-----
> > From: Annu Roopa [mailto:annu_roopa@yahoo.com]
> > Sent: Tuesday, May 28, 2002 5:16 PM
> > To: JPaglia@NA2.US.ML.com; Logan, Harold; emonk@att.net;
> > ccielab@groupstudy.com
> > Subject: RE:BGP Update-Source issue
> >
> >
> > 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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