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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
that is, your ip core and edge are sort of very "close" to each other. it's not like, say, in uunet, where this architectural distance is greater. true? -- dima. > -----Original Message----- > From: Chris Liljenstolpe [mailto:[email protected]] > Sent: Wednesday, July 12, 2000 7:13 AM > To: Dmitri Krioukov; Bora Akyol > Cc: nanog > Subject: RE: Running BGP4 on a Core Router > > > Dimirtri, > > I have to disagree with you on this statement. While the > physical trunks > are not connecting routers together in the C&W network, there is most > definately an IP core. The L2 core provides a mesh for core routers at > each site, wich provide the hierarchy for edge/fannout routers. > Therefore > we have both an IP and L2 core with the IP core overlayed over > the L2 core. > > Chris > > > --On Tuesday, 11 July 2000 21.54 -0400 Dmitri Krioukov > <[email protected]> > wrote: > > > > > 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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