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

  • From: Giles Heron <giles@goneto.net>
  • Date: Thu, 05 Jul 2001 17:58:58 +0100
  • Cc: 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>
  • Organization: Gone2 Ltd.

"Andrew G. Malis" wrote:
> 
> Giles,
> 
> >I'm not sure that this disagrees with our position at all?
> >
> >In your example there is still a tunnel available.  It just isn't the
> >primary tunnel?
> 
> Perhaps, but not necessarily - for example, the primary tunnel could go
> down, triggering the generation of a backup tunnel, but for some small
> amount of time, there is no tunnel in existence.  Or, the primary could go
> down, and MPLS in IP or MPLS in GRE is defined as the backup "tunnel".  In
> either case, we don't want to withdraw the VC label.  And in the latter,
> case, we still want to allow new VC tunnels to be created.

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?

Giles

-- 
============================================================
Giles Heron      Principal Network Architect      Gone2 Inc.
ph: +44 7880 506185         "if you build it they will yawn"
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