Subject: RE: draft-raggarwa-rsvpte-pw-01.txt

From: "Yaakov Stein" <[email-masked]>
Date: Mon, 28 Mar 2005 11:01:49 +0300

> If the only reason  for the PW setup protocol to signal  TE parameters
is so
> that  those  parameters  can  be  used to  select  the  appropriate
traffic
> engineered tunnel, then a very straightforward solution would be to: 
 
> - use RSVP-TE to set up the tunnels
> - add a TE parameter to LDP/L2TPv3. 
 
Actually it requires fewer protocol changes to use LDP for the label
distributions, and RSVP-TE purely for the resource reservations
(as the original RSVP was used).

In that case the procedure is as follows:

1.   PSN tunnel set up manually or by RSVP-TE
2.   All PW segments "set up" by PWE-LDP signalling
3.1 Once end-to-end PW exists, RSVP is sent over it requesting
resources.
3.2  If resources not available anywhere along the chain, the S-PE
      returns a message to the U-PE, and the U-PE decides whether
      it wants to tear down the PW or not.
3.3 If resources are available everywhere the U-PE sends an
acknowledgement
     that the PW has been configured as requested.

Y(J)S