The MPLS WG Archive

["Andrew G. Malis" <Andy.Malis@vivacenetworks.com>]

At 3/25/2003 10:04 AM -0500, Eric Rosen wrote:

>Nurit> I do look for  a way to bind the (LDP) signaled  PWs to the (RSVP-TE)
>Nurit> signaled transport tunnel LSP, in a way that both PEs know about it.
>
>There is no way to do this using the protocols as currently defined.

I agree with Eric, and it's the way it is for a very good reason - as a 
result of requiring PW labels in the platform label space, deciding which 
RSVP-TE tunnel to use for the LDP-signaled PWs is purely a local matter at 
the PE that's encapsulating the L2 frames.  This allows a number of nice 
properties, such as the ability to very easily switch to a backup tunnel if 
there's a primary tunnel failure and the network isn't using FRR in the 
core, or to load-share over multiple tunnels if the PW doesn't have 
sequentiality requirements (or has partial sequentiality 
requirements).  Using end-to-end signaling to bind a PW to a particular 
tunnel removes these properties.

Cheers,
Andy