The MPLS WG Archive

[Yangguang Xu <xuyg@lucent.com>]

Kireeti,

Several ways to do:
1) A can request the first LSP to optical network (x-y), then request another
one which different the first one (w-z, also with LSP ID of x-y to avoid). 

2) A can send one request for two disjointed paths (x-y) and (w-z) together.

The key point is whatever routers can do to optical network, optical switches
can do by themselves (as easy as router can do). Why bother?

Yangguang

>Suppose router A wants to get to router B, and wants to take two
>different ingress and egress points in the optical domain, X->Y
>for the primary LSP, and W->Z for the backup.  A does not require
>optical protection for the X->Y path, nor for the W->Z path.  A
>*does* require that the X->Y path and the W->Z path do not share
>common links.  How is this to be done?

>If A did the full path computation, this is simplicity itself.