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Fast Reroute and Refresh Reduction

  • From: Ping Pan <pingpan@cs.columbia.edu>
  • Date: Tue, 11 May 2004 13:35:28 -0700
  • Cc: IETF MPLS List <mpls@UU.NET>
  • User-Agent: Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.4)Gecko/20030624 Netscape/7.1 (ax)

David Charlap wrote:

> On the other hand, actually implementing refresh reduction in this 
> context is not trivial.  The RR control data that is normally associated 
> with an interface (e.g. most recently received message ID, list of 
> message IDs to Ack/Nack, etc.) must now also be associated with every 
> bypass LSP.  Code that works with these structures must now be able to 
> work with them, both on interfaces and on LSPs, instead of just on 
> interfaces.
> 

Supporting RR in this case is very straight forward, as RR works per 
RSVP neighbor - in addition to per-interface. In facility fast reroute, 
you run RR over the bypass LSP (treating it as if it is a neighbor) 
directly.

- Ping