From: Scott Morris (smorris@ipexpert.com)
Date: Thu Aug 23 2007 - 15:25:13 ART
Likely depends on the size of ISP and size of core! :) Everyone should do
whatever makes the most sense to them. And realize that there are a LOT of
messed up networks in the world that still manage to "work" just fine!
Scott
-----Original Message-----
From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf Of
Mohamed, Liban [NTK]
Sent: Thursday, August 23, 2007 1:27 PM
To: C SAMARTH; Brian McGahan; Gregory Gombas; Cisco certification
Subject: RE: Question for you ISP guys
Not that I am aware, @least the Tier I SP's still run IBGP in the core.
Liban Mohamed
-----Original Message-----
From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf Of C
SAMARTH
Sent: Thursday, August 23, 2007 1:09 PM
To: Brian McGahan; 'Gregory Gombas'; 'Cisco certification'
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
certification> > 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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