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RE: Feature Make-Before-Break and MPLS Traffic Engineer

  • From: "Daniel King" <daniel.king@aria-networks.com>
  • Date: Thu, 28 Jun 2007 16:59:48 +0100
  • Cc: <mpls-ops@mplsrc.com>
  • Resent-Date: Thu, 28 Jun 2007 13:09:25 -0400
  • X-Originating-Pythagoras-IP: [88.96.235.142]
  • X-Scanned-By: MIMEDefang 2.53 on 209.239.41.31

Hello Lavoisier,

 

As you may know make-before-break is a function to reroute or optimize an LSP. The goal is to achieve a new optimal route for the existing LSP. The router head-end needs to compute a path, signal the new route, share traffic with the existing LSP, switch traffic onto the new LSP and remove the existing route. I’d suggestion reading the IETF MPLS-TE Soft Preemption draft for further information:    

 

http://tools.ietf.org/html/draft-ietf-mpls-soft-preemption-08

 

There are some large carriers in North American and Japan that are using MPLS-TE fairly extensively. If you look at the IETF MPLS Working Group you will notice a number of engineers from various carriers around the world who are involved with developing MPLS-TE solutions. There are also a number of carriers deploying Point-to-Multipoint (P2MP) MPLS-TE to carry video services. In fact P2MP MPLS-TE poses some significant path computation problems that will require the development of new algorithms.  

 

Best regards,

Dan

 

 

From: Lavoisier Farias [mailto:lavoisier@gmail.com]
Sent: 24 June 2007 15:58
To: mpls-ops@mplsrc.com
Subject: [MPLS-OPS]: Feature Make-Before-Break and MPLS Traffic Engineer

 

Hi Everyone,

I am working on the issue of algorithms for traffic engineering at MPLS networks and I have the following questions:

  • One question that I read but still not clear to me is how it works the feature "Make-Before-Break" on LSP Tunnels.
  • I very long time ago I asked in the IETF list if MPLS Traffic Engineer is deployed at Carriers in large scale around the world.

Any light to this questions I would appreciate.

Thank you in advance,
Lavoisier Farias.