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draft-meyer-soft-preemption-00.txt

  • From: Curtis Villamizar <curtis@fictitious.org>
  • Date: Mon, 17 Mar 2003 16:54:04 -0500
  • cc: George Swallow <swallow@cisco.com>, "Adrian Farrel" <afarrel@movaz.com>, mrn@gblx.net, denver@gblx.net, jpv@cisco.com, "'mpls@uu.net'" <mpls@UU.NET>


In message <200303172010.PAA32522@workhorse.fictitious.org>, Curtis Villamizar 
writes:
> 
> Also, I haven't mentioned to the list, but if you put the preempted
> bit back in the PATH ERO, others downstream of the initial
> soft-preempt can soft-preempt the same LSP during the time that it
> reroutes.  If we are looking for sub-second convergence plus
> soft-preempt, this could be a very valuable feature.  The bit change
> in the ERO is purely advisory and requires no change in resource
> allocation so it can be propogated very quickly, much more quickly
> than CSPF plus path setup.


Pavan Beeram pointed out that this could go in the PATH RRO and be
sent directly by the midpoint at the time of failure to indicate to
the downstreams that an soft-preempt was pending and increasing the
chance of preempting the same LSP rather than a different one.

Curtis