Re: FW: I-D ACTION:draft-bhatia-ecmp-routes-in-bgp-00.txt

[Mireille Shammas <[e-mail]>]

Hi Manav,
In this draft you don't mention anything about ECMP in a BGP/MPLS VPN network
and more precisely ECMP between PE and CE where EBGP is used. Note that IBGP is
used to relay the MPLS label information between PEs. I think this will totally
depend on how you choose the labels on a local PE to advertise to a remote PE
to carry the VPN traffic back to the CE. Sample scenario below:

|      |-------ebgp session--------|
|                                                        |       |
| CE|-------ebgp session--------| PE1| =======IBGP/MPLS===========|PE2| .......

|      |-------ebgp session--------|
|                                                        |       |

 I am mainly interested in what will happen on PE1, and how to balance
VPN/labelled traffic coming from PE1 towards CE .
Thanks
Mireille


Manav Bhatia wrote:

> Hi,
> Please look into this new Internet draft which is available from the
> on-line Internet-Drafts directories.
>
> I-D ACTION:draft-bhatia-ecmp-routes-in-bgp-00.txt
> To: IETF-Announce: ;
> Subject: I-D ACTION:draft-bhatia-ecmp-routes-in-bgp-00.txt
> From: [e-mail]
> Date: Thu, 15 May 2003 07:19:32 -0400
> Reply-to: [e-mail]
> Sender: [e-mail]
>
> A New Internet-Draft is available
>
> Title  : Advertising Equal Cost Multi-Path (ECMP) routes in BGP
> Author(s) : M. Bhatia
> Filename : draft-bhatia-ecmp-routes-in-bgp-00.txt
> Pages  : 7
> Date  : 2003-5-14
>
> This document describes an extensible mechanism that will allow a BGP
> [BGP4] speaker to advertise equal cost multi-path (ECMP) routes for a
> destination to its peers without changing the semantics of the UPDATE
> message.
>
> A new BGP attribute is introduced that will be used to advertise the
> multiple next hops for the feasible and the un-feasible ECMP BGP routes to
> the remote peers.
>
> The mechanisms described in this document are applicable to all routers,
> both those with the ability to inject multiple routing  entries in their
> forwarding table and those without (although the latter need not implement
> some extensions described in this document).
>
> A URL for this Internet-Draft is:
> http://www.ietf.org/internet-drafts/draft-bhatia-ecmp-routes-in-bgp-00.txt
>
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