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Re: IGP tuning for TE versus MPLS-TE

  • From: Mathew Lodge <Mathew@CPlane.com>
  • Date: Wed, 30 Oct 2002 08:25:05 -0800
  • Cc: <mpls-ops@mplsrc.com>
  • Resent-Date: Wed, 30 Oct 2002 13:09:05 -0500
  • To: "alok" <alok.dube@apara.com>, "M. ELK" <elkou141061@hotmail.com>
  • X-Apparently-From: MathewLodge@aol.com
  • X-Sender: lodge@mail.cplane.com

All,

There is an excellent discussion of optimal routing done via IGP metrics (no MPLS) vs. explicit path selection (MPLS TE) from AT&T. You can find it at

http://www.research.att.com/~jrex/papers/ieeecomm02.long.ps
http://www.research.att.com/~jrex/papers/ieeecomm02.long.pdf

Note that this paper is a discussion of theory -- i.e., it addresses how close can you get to optimal routing using Dijkstra's SPF algorithm with judicious link weight selection, and what happens to the efficiency of the network when links fail and IGP re-routes traffic. In practice, I wonder how disruptive it would be to a regular IP network to go around tinkering with the link weights on every router with an offline TE tool (which this approach mandates).

Cheers,

Mathew


At 03:26 PM 10/30/2002 +0530, alok wrote:
what do u do for "non ip" traffic ;o)
 
can u "TE" it too with IGP tunning?
 
 
 
-rgds
alok
----- Original Message -----
From: M. ELK
To: mpls-ops@mplsrc.com
Sent: Wednesday, October 30, 2002 3:01 PM
Subject: [MPLS-OPS]: IGP tuning for TE versus MPLS-TE

Their is some hot debate previously on this list about an article on MPLS which stated that no need for MPLS ,anyhow the conclusion from this debate was that the writer of such article is clueless .
here is a doc from sprint which state exactly the same :
http://www.sprintbiz.com/business/resources/resource/SprintCiscoMPLS.pdf
(guess ,could not state that they are clueless too . also the doc have the cisco logo ) .
 
need not to start another hot debate ,just need U comment on the possibility
and limitation of TE by tuning IGP versus MPLS-TE , any other provider
droped MPLS-TE favoring IGP tunning ? .
 
Brgds

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| Mathew Lodge                 | mathew@cplane.com     |
| Director, Product Management | Ph: +1 408 789 4068   |
| CPlane, Inc.                 | http://www.cplane.com |