Re: GRSVP-TE and MSSPRING

["Diego Caviglia" <Diego.Caviglia@marconi.com>]

Hi Adrian,
                      I think you're right.

Moreover seems that it is the only way to do that without enhancing the
routing protocol.

Regards.

Diego



"Adrian Farrel" <adrian@olddog.co.uk> on 25/11/2003 22.44.33

Please respond to "Adrian Farrel" <adrian@olddog.co.uk>

To:    <ccamp@ops.ietf.org>, "Diego Caviglia" <Diego.Caviglia@marconi.com>
cc:

Subject:    Re: GRSVP-TE and MSSPRING


Diego,

I believe that if you use Label Set and Acceptable Label Set you will
arrive at the right
result.
It may take a few messages backwards and forwards to sort it out.

Regards,
Adrian
----- Original Message -----
From: "Diego Caviglia" <Diego.Caviglia@marconi.com>
To: <ccamp@ops.ietf.org>
Sent: Tuesday, November 25, 2003 3:00 PM
Subject: GRSVP-TE and MSSPRING


> Hi all,
>               MSSPRING has been defined in ITU-T G.841 and is widely used
> as inherent protection scheme in transport network (SDH).
>
> MSSPRING introduces some constraints to Label selection due to the
> impossibility to change TimeSlot (a.k.a. Label) inside a MSSPRING ring.
>
> In case of bi-directional LSP Upstream TNE has to choose the Label and
> signal it by means of the UPSTREAM Label obj but if the TNE is inside a
> MSSPRING ring it MUST choose a Label that is free on all the TNE
traversed
> by the LSP that are part of the MSSPRING ring.
>
> Of course the problem is that it does not have that information.
>
> My question is how can I signal, with GRSVP-TE, a bidirectional LSP that
> traverses an MSSPRING ring?
>
> My impression is that I can not.
>
> Any answer is welcome.
>
> Regards
>
> Diego
>
>
>
> ------------------------------------------
> Diego Caviglia
> Marconi - Optical Networks
> ASTN/GMPLS - System Design Manager
> Via A. Negrone 1/A
> 16153 Genoa - Italy
> Phone: +390106003736
>
>
>
>
>
>