From: Gabriel Nunes (gabriel.nunes@gmail.com)
Date: Thu Aug 23 2007 - 17:52:24 ART
Hi Mohamed,
P and PE belongs to VPN MPLS terminology. If you have an ISP backbone where
you don't have MP-BGP running, you don't have P and PE routers. In this case
you would have an MPLS core backbone only with probaly a Traffic
Engineering...
Gabriel Nunes
CCIE#17737
On 8/23/07, Mohamed M Moustafa <mmma@gawab.com> wrote:
>
> Hi,
>
> As Brian has stated, only the core routers (P routers) are not running BGP
> as they only do label switching but the edge routers (PE routers) still
> need to run BGP, this is always the case of an MPLS backbone providers,
> but
> all the routers needs to run IGP (most commonly ISIS or OSPF), before even
> MPLS can operate, and the first benefit of MPLS is that the core routers
> needs not a full internet routing table as they just do label switching,
> and then comes all the advanced features of MPLS.
>
> HTH,
> Mohammed Mahmoud.
>
>
> C SAMARTH <samarth_04@hotmail.com> wrote on 23 Aug 2007, 08:08 PM:
> Subject: RE: Question for you ISP guys
> >Has any of the ISP's completely stopped running any BGP in their core and
> >running only MPLS + IGP there?
> >
> >Best Wishes,
> >SAMARTH
> >CCIE #18535
> >
> >> From: bmcgahan@internetworkexpert.com> To: ggombas@gmail.com;
> >ccielab@groupstudy.com> Subject: RE: Question for you ISP guys> Date:
> Thu,
> >23
> >Aug 2007 11:34:39 -0500> > A lot of large providers run IS-IS as their
> IGP,
> >BGP at the edge,> and then MPLS in the core. Running MPLS not only
> enables
> >advanced services> like traffic engineering and L2/L3 VPNs, it also
> removes
> >the requirement of> transit devices having to carry the full public BGP
> >table.
> >It works this> way because the MPLS enabled routers don't need to know
> what
> >the final> destination of a packet is, only what the exit point is.> >
> >HTH,> >
> >Brian McGahan, CCIE #8593 (R&S/SP/Security)>
> >bmcgahan@internetworkexpert.com >
> >> Internetwork Expert, Inc.> http://www.InternetworkExpert.com> Toll
> Free:
> >877-224-8987 x 705> Outside US: 775-826-4344 x 705> 24/7 Support:
> >http://forum.internetworkexpert.com> Live Chat:
> >http://www.internetworkexpert.com/chat/> > > > -----Original
> Message----->
> >>
> >From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf Of>
> >
> >Gregory Gombas> > Sent: Thursday, August 23, 2007 10:37 AM> > To: Cisco
> >certification> > Subject: Question for you ISP guys> > > > For those of
> you
> >with ISP experience, can you tell me what routing> > protocols do service
> >providers typicall run within their AS?> > > > Do you have every single
> >router
> >running BGP? I can't imagine> > redistributing 225k+> > routes into an
> IGP,
> >so
> >how do you pass these routes withing your AS?> > > > If you are using
> iBGP
> >what are you using to transmit next hop> > information (as iBGP does not
> >normally update the next hop of the> > external AS)?> > > > Can someone
> >point
> >me to some documentation showing typical ISP routing> > design?> > > >
> >Thanks,> > Greg> > > >
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