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Re: Running BGP4 on a Core Router

  • From: Bora Akyol
  • Date: Mon Jul 10 00:13:52 2000

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.
>