Notify Message Doubt

["manoj juneja" <manojkumarjuneja@hotmail.com>]

Hi All,
        It is mentioned in drft draft-ietf-mpls-generalized-rsvp-te-07.txt 
(sec. 4.3) that Notify Message provides a mechanism to inform non-adjacent 
nodes of LSP related events.

I think the generation of PathErr or ResvErr at a node will also trigger the 
generation of Notify message to the notify address as received in Path or 
Resv Message. What will the end node need to do when it receives the notify 
message prior to path/resv err ?

What will the advantage of sending Notify message to the end node before it 
receives path/resv err ?

Please help me in understanding its advantage/significance in the optical 
domain.

Regards,
manoj.

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