The MPLS WG Archive

[Paul Moore <paul-patrick.moore@alcatel.be>]

Dmitri,

Where is that stated? I've checked in the MPLS Architecture documents,
searching with the "bidirectional" and "bi-directional" keywords, and I
haven't been able to find it mentioned.

On the other hand, the two applicability documents for CR-LDP and RSVP-TE both
state that bi-directional LSP set up is not yet supported:

Applicability Statement for CR-LDP (13805 bytes):
    "CR-LDP specification only supports unidirectional LSP setup.
Bi-directional LSP setup is FFS."

Applicability Statement for Extensions to RSVP for LSP-Tunnels (16573 bytes):
    "The RSVP-TE specification supports only unidirectional LSP- tunnels.
Bidirectional LSP-tunnels are not supported."

Many thanks,
Paul

PS Thanks Jane for the response.

 Dmitri Ryumkin wrote:

> Paul,
>
> Generalized MPLS defines procedures for bi-directional LSP setup.
>
> Regards,
> Dmitry Ryumkin
>
>  -----Original Message-----
> From:   djiang1@lucent.com [mailto:djiang1@lucent.com]
> Sent:   Monday, February 26, 2001 8:52 AM
> To:     Paul Moore
> Cc:     mpls@UU.NET
> Subject:        Re: MPLS LSPs and ATM PVCs
>
> HI Paul,
>
> I believe RSVP is never intended to set up two LSPs using one single
> operation.  We will have to use two RSVP signalling operations to set up
> the two LSPs, one for each direction, even if the PVC may be used
> bidirectionally.
>
> Regards,
> Jane D. Jiang
>
> Paul Moore <paul-patrick.moore@alcatel.be>@UU.NET on 02/26/2001 08:11:29 AM
>
> Sent by:  owner-mpls@UU.NET
>
> To:   mpls@UU.NET
> cc:
> Subject:  MPLS LSPs and ATM PVCs
>
> Hello,
>
> I have a question about MPLS and ATM. ATM point-to-point PVCs can be
> either uni-directional or bi-directional. MPLS LSPs are only
> uni-directional. Is there any work being done concerning bi-directional
> LSPs, for example, to allow two LSPs to be established by a single RSVP
> signalling operation?
>
> I've just joined the list, so apologies if this has already been
> discussed.
>
> Thanks,
> Paul
>
> --
> Paul Moore
> Alcatel Bell
> +32 3 450 3536
> paul-patrick.moore@alcatel.be

--
Paul Moore, ext 53536
paul-patrick.moore@alcatel.be
Alcatel Bell
03/450.3536