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Cell Relay Retreat>MPLS WG Archive>month:2002-Jul> msg00213



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initiating a discussion on mpls singaling protocols

  • From: David Charlap <david.charlap@marconi.com>
  • Date: Fri, 19 Jul 2002 10:18:39 -0400
  • User-Agent: Mozilla/5.0 (Windows; U; WinNT4.0; en-US; rv:1.1a) Gecko/20020613

Yangguang Xu wrote:
> 
> Cause many folks raise the RSVP-TE soft state issue and its apparent drawbacks
> for GMPLS environment. Just a question, if we configure the refresh timer very
> large, disable the refresh reduction and also maximize the time-out multiplier.
> Will these help, or they make things worse?

If you do all of these, then you can no longer detect or handle failures 
that don't cause carrier to be lost in the data-plane.

It is possible to safely use a very large refresh timer, but only when 
refresh reduction and hello are in use on all peers.  The message-id 
part of refresh reduction will allow for retransmission of lost packets, 
and hellos will detect soft failures.

-- David