From: Jensen, Brian D. (bdjensen@eschelon.com)
Date: Thu Aug 23 2007 - 21:42:53 ART
Hi Everyone,
Today a person who works on the ISP side asked me a question (I work
enterprise). He asked why I didn't use the "S" train code everywhere
instead of the Mainline or "T" train code I had in production. I thought
this is a great question, since he thought that "S" train was better all
around. Is it? What are the main differences?
TIA!
Brian
-----Original Message-----
From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf Of
Mounir Mohamed
Sent: Thursday, August 23, 2007 7:02 PM
To: Gabriel Nunes
Cc: Mohamed M Moustafa; C SAMARTH; Gregory Gombas; Cisco certification;
Brian McGahan
Subject: Re: Question for you ISP guys
HI Gabriel,
It's not VPN-MPLS terminology ONLY,PE and P is a terminology for any
MPLS implementations, So why did u reserve it for only one application
(MPLS-VPN) actually if am providing MPLS-ATOM i will call my gears PE
and P as soon as they imposing and deposing labels. so the Guy (Mohamed)
was talking about MPLS benefits so it's clear that he meaning MPLS
applications.
Best Regards,
Mounir Mohamed
On 8/23/07, Gabriel Nunes <gabriel.nunes@gmail.com> wrote:
>
> 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
> > >certification> > 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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-- Best Reagrds, Mounir Mohamed
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