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

  • From: Jean Philippe Vasseur <jvasseur@cisco.com>
  • Date: Mon, 24 Feb 2003 12:14:08 -0500
  • Cc: Ina Minei <ina@juniper.net>, 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>

At 14:46 20/02/2003 -0500, Curtis Villamizar wrote:

>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.

Agreed.

JP.

>Curtis