RE: Running BGP4 on a Core Router

["Dmitri Krioukov" <dima () krioukov net>]

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:chris () cw net]
> 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 
> <dima () krioukov net> 
> 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: 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.