[29978] in North American Network Operators' Group
RE: Running BGP4 on a Core Router
daemon@ATHENA.MIT.EDU (Dmitri Krioukov)
Tue Jul 11 21:42:28 2000
From: "Dmitri Krioukov" <dima@krioukov.net>
To: "Bora Akyol" <akyol@akyol.org>
Cc: "nanog" <nanog@merit.edu>
Date: Tue, 11 Jul 2000 21:54:55 -0400
Message-ID: <NCBBIKACLKNMKDHKKKNFKEIBEMAA.dima@krioukov.net>
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Errors-To: owner-nanog-outgoing@merit.edu
we can even imagine some core that is
not ip core but, say, atm core and all
lsrs are atm-lsrs.
actually some providers (like c&w)
have exactly this no ip core, overlay
model. it's far from being the best one.
--
dima.
> -----Original Message-----
> From: owner-nanog@merit.edu [mailto:owner-nanog@merit.edu]On Behalf Of
> Bora Akyol
> Sent: Monday, July 10, 2000 12:10 AM
> To: nanog
> Subject: Re: Running BGP4 on a Core Router
>
>
>
> Even with MPLS, you need to run some sort of a routing protocol.
>
> ISIS or OSPF with TE extensions would do.
>
> One can also use BGP with MPLS Label extensions as well. By the way, how
> does this work with route reflectors?
>
>
> Bora
>
>
> ----- Original Message -----
> From: "Jesper Skriver" <jesper@skriver.dk>
> To: "HANSEN CHAN" <hansen.chan@alcatel.com>
> Cc: <nanog@merit.edu>
> Sent: Sunday, July 09, 2000 8:20 PM
> Subject: Re: Running BGP4 on a Core Router
>
>
> >
> > On Sun, Jul 09, 2000 at 07:49:37PM -0400, HANSEN CHAN wrote:
> > >
> > > Hi folks,
> > >
> > > I was hearing that typically BGP4 is run on all routers inside a POP,
> > > including access routers connecting to customers, border routers
> > > connecting other ISPs and core routers connecting to other POPs in the
> > > same network.
> > >
> > > I can understand why BGP4 is run on access and border routers. But
> > > running BGP4 on core routers is beyond my understanding. I thought you
> > > don't need to run BGP4 on core routers which are considered to be
> > > interior nodes.
> > >
> > > Can someone shed some light on what is the benefit of running BGP4 on
> > > the core routers?
> >
> > If these routers run "normal" ip routing you have to, as each router
> > does a lookup of the destination ip address of each packet, and forward
> > it accordingly.
> >
> > If you run MPLS, you don't have to, as it uses labels to get to the
> > next-hop router.
> >
> > /Jesper
> >
> > --
> > Jesper Skriver, jesper(at)skriver(dot)dk - CCIE #5456
> > Work: Network manager @ AS3292 (Tele Danmark DataNetworks)
> > Private: Geek @ AS2109 (A much smaller network ;-)
> >
> > One Unix to rule them all, One Resolver to find them,
> > One IP to bring them all and in the zone to bind them.
> >
>
