From: ccie 2005 (cui666@gmail.com)
Date: Fri Sep 09 2005 - 22:54:13 GMT-3
It's rather one of the benefits of having MPLS as the transport
protocol, so every vendor who has MPLS would have it(Cisco, Juniper,
Alcatel, etc)
Joe's comments are very true, we are running a BGP-FREE core network
in our production network, both MPLS/VPN and MPLS/IP using Cisco,
Juniper and Alcatel gears. it really makes your core network stable
since only MPLS and ISIS(most SPs use it as core IGP) are required,
less complexity.
On 9/9/05, Richard Dumoulin <Richard.Dumoulin@vanco.fr> wrote:
> Yes this is the feature I am referring to. That is why I was wondering if
> Juniper worked the same way.
>
> -- Richard
>
> -----Message d'origine-----
> De : Joe Rinehart [mailto:jjrinehart@hotmail.com]
> Envoyi : samedi 10 septembre 2005 01:07
> @ : Richard Dumoulin; ccielab@groupstudy.com
> Objet : Re: Cisco MPLS
>
> Anyone feel free to jump in if I am way off base here...
>
> It's pretty much just a function of how the routing is set up...I created a
> mini-MPLS network on my lab rack and really was surprised to see how the
> mechanics all work, especially as I tried to mimic how we have it set up at
> AT&T. The feature you are referring to is sometimes called a route-free
> core. The label switched core itself doesn't have any knowledge of edge (or
> MPLS VPN) routes at all, they are clueless of anything outside the backbone
> itself. Usually an IGP like OSPF or ISIS is run between the P nodes in the
> core and includes the PE devices too. I had one router get all buggy
> because of short memory so I verified just using static routing across the
> simulated backbone and that worked too. The core just uses IGP and internal
> routes and does the label switching from PE to PE.
>
> The magic is at the PE, it's pretty much doing all the heavy lifting. The
> PE runs BGP at the edge only, peering with the CE (using eBGP) and other
> PE's (using iBGP), and it's also responsible for creating the MPLS VPN's
> using Route Distinguishers and Multiprotocol BGP. The core doesnt know,
> doesnt care and doesnt play with BGP or the VPN's, it just pushes traffic...
>
> The same would apply to Internet routes, as the BGP on the edge/PE routers
> would know all of it, advertise routes, and such, but once passed to the
> core P routers it would be label switched....
>
> It really is cool fascinating stuff.....
>
> Joe Rinehart
> CCIE #14256, CCNP, CCDP
> Data Network Consultant
> AT&T Pacific Northwest Enterprise Markets
> ----- Original Message -----
> From: "Richard Dumoulin" <Richard.Dumoulin@vanco.fr>
> To: <ccielab@groupstudy.com>
> Sent: Friday, September 09, 2005 2:03 PM
> Subject: Cisco MPLS
>
>
> > There is a feature in MPLS that I find powerful and it is the possibility
> of
> > building an Internet backbone with 160000 routes present only in the PEs
> > routing table. I was wondering if this was only a Cisco feature or do the
> Ps
> > of other vendors also support this like Juniper for example?
> >
> > Thx
> >
> > -- Richard
> >
> >
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