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North American Network Operators Group Date Prev | Date Next | Date Index | Thread Index | Author Index | Historical RE: Running BGP4 on a Core Router
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: [email protected] [mailto:[email protected]]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" <[email protected]> > To: "HANSEN CHAN" <[email protected]> > Cc: <[email protected]> > 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. > > >
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