From: Scott Morris (smorris@ipexpert.com)
Date: Thu Aug 23 2007 - 22:16:09 ART
That's an answer best left for Feature Navigator and your own personal
needs. Check out the differences (Compare two images) and see whether
there's really anything you truly need in an S-train release!
Typically there's things that make sense for various service providers but
no necessarily enterprises. Some things are tighter (meaning what it does
NOT have) but others fluffier. But there's nobody who will have a better
understanding of your network needs than yourself.
HTH,
Scott Morris, CCIE4 (R&S/ISP-Dial/Security/Service Provider) #4713, JNCIE
#153, CISSP, et al.
CCSI/JNCI-M/JNCI-J
VP - Technical Training - IPexpert, Inc.
IPexpert Sr. Technical Instructor
A Cisco Learning Partner - We Accept Learning Credits!
smorris@ipexpert.com
Telephone: +1.810.326.1444
Fax: +1.810.454.0130
http://www.ipexpert.com
PS. www.cisco.com/go/fn
-----Original Message-----
From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf Of
Jensen, Brian D.
Sent: Thursday, August 23, 2007 8:43 PM
To: Cisco certification
Cc: Brian McGahan
Subject: RE: Question for you ISP guys:
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
This archive was generated by hypermail 2.1.4 : Sat Sep 01 2007 - 11:32:13 ART