From: Mounir Mohamed (mounir.mohamed@gmail.com)
Date: Thu Aug 23 2007 - 22:39:51 ART
The S - Service Provider train, runs only on the company's core router
products and is heavily customized for Service Provider customers, Mainline
or T / Enterprise Train has a lot of Enterprise services that doesn't
supported on S Train for example (NAT not supported on S while it does on T
and Mainline with Enterprise or Advanced IP services feature set) in the
same time MPLS ATOM supported on the S Train while it doesn't on Enterprise,
AND so on
On 8/24/07, Jensen, Brian D. <bdjensen@eschelon.com> wrote:
>
> 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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-- Best Reagrds, Mounir Mohamed
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