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draft-meyer-mpls-soft-preemption-00.txt

  • From: Curtis Villamizar <curtis@fictitious.org>
  • Date: Thu, 20 Feb 2003 14:46:31 -0500
  • cc: Curtis Villamizar <curtis@fictitious.org>, "Nguyen, An" <nguyena@ncs.gov>, "'Jim Boyle '" <jboyle@pdnets.com>, "'Matthew Meyer '" <mrm@gblx.net>, "'mpls@UU.NET '" <mpls@UU.NET>


In message <20030220101031.J43335@garnet.juniper.net>, Ina Minei writes:
> 
> >
> > As a practical matter, I don't think there would be other traffic that
> > would be preempting "authorized emergency preparedness" traffic for
> > Federal, state, and local.
> 
> 	Agreed. However, think of the scenario where you want to move away
> traffic from particular links for a maintenance window. In that case, even
> this high priority LSP would have to be preempted.
> 
> 				Ina


That's make-before-break rerouting.  If you do it right, increase
metric, reset LSPs if reroute timers are long or set an admin-color
and set exclude-admin-color on the LSPs (just leave them set that
way).  You can name the admin-color "maintenance".  No preemption
occurs.  The LSPs just voluntarily move off the link, then you shut
the idle link down.  Requires that your routers do make-before-break
correctly and that your operational staff is sufficiently clued in.

Curtis