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Cell Relay Retreat>MPLS WG Archive>month:2001-Jul> msg00048



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[PWE3] A doubtregardingdraft-martini-l2circuit-trans-mpls-06.txt

  • From: "Andrew G. Malis" <Andy.Malis@vivacenetworks.com>
  • Date: Thu, 05 Jul 2001 13:22:02 -0400
  • Cc: "Andrew G. Malis" <Andy.Malis@vivacenetworks.com>, Luca Martini <luca@level3.net>, Sasha Vainshtein <Sasha@AXERRA.com>, "'pwe3@ietf.org'" <pwe3@ietf.org>, "'mpls@uu.net'" <mpls@UU.NET>, Alik Shimelmits <alik@AXERRA.com>, Gonen Zilber <gonen@AXERRA.com>, Israel Sasson <israel@AXERRA.com>

Giles,

>MPLS in IP or MPLS in GRE is a tunnel as far as I'm concerned - so you
>shouldn't withdraw the labels.
>
>But yes, I take your case about backup tunnels.  Really this is the
>standard issue of layering and holddown timers isn't it?  IF the backup
>tunnel doesn't kick in within x seconds THEN withdraw the advertised
>labels?

It's not just that.  Another problem the current language is, for example, 
if A is advertising VC labels to B using DU, A needs to somehow figure out 
if B has a tunnel (of any sort) back to A before it can advertise the label 
to B.  I think that's impossible in the general case.

Cheers,
Andy