make-before-break in Gmpls

[Manoj Agiwal <manoj.agiwal@metro-optix.com>]

Hi ,
         The gmpls architecture documents says 
"GMPLS does not add anything new. Elegant re-routing is possible with the
concept of "make-before-break" whereby an old path is still used while a new
path is set up by avoiding double reservation of resources. Then, the node
performing the re-routing can swap on the new path and close the old path.
This feature is supported with RSVP-TE (using shared explicit filters) and
CR-LDP (using the action indicator flag). 
          Will this feature will hold good for optical networks as well ,
where we have TDM , LSC  LSPs. This would require use of 
     SE style in optical networks . Does signaling has to take care of not
reserving extra resources ( bandwidth / time slot )
    across the common path of the two LSPs , what will happen at the nodes
where the two routes diverge and converge .
    Is it expected that the signal will get multicast to both the routes ,
and at the node where the route converge the signal
    is selected from the better of the two paths till the rerouted LSP is
torn down .
Regards,
Manoj