From: C SAMARTH (samarth_04@hotmail.com)
Date: Thu Aug 23 2007 - 14:08:40 ART
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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