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Cell Relay Retreat>MPLS WG Archive>month:2001-May> msg00583



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Last call - RSVP problems

  • From: David Charlap <david.charlap@marconi.com>
  • Date: Wed, 30 May 2001 10:55:39 -0400

Dimitrios Pendarakis wrote:
> 
> Could you please clarify why you think RSVP Hello doesn't work for
> parallel (redundant) control channels?

RSVP Hello messages are sent between adjacent IP addresses.  If there
are multiple unnumbered links between two routers, only one set of
Hellos are generated for all the links.  If the multiple links are all
numbered, then Hello messages are sent for each of the links.

As a result of this, RSVP Hello can only detect link failure when all
links between two routers are numbered.  If there are unnumbered links
between two routers, Hellos will not be interrupted until all of the
links fail - meaning it will only detect node failure.

-- David