The MPLS WG Archive

["Alexander Attsik" <atcik@lmail.loniis.ru>]

 I need to understand some principles of MPLS-TE, could you help me please.

In MPLS-TE, RSVP-TE (or CR-LDP) sets up explicit routes, previously computed
by means of
Constraint-Based Routing. In light of this I have following questions:

1. Who sets the above mentioned constraints and initiates the procedure of
Constrained Shortest Path calculation?

2. And quite similar question:

Imagine such situation:

 A----(B---- . . . ----C)----D

B and C are edge routers of MPLS-TE domain
A and D belong to non-MPLS  areas.

A wants to communicate with D, is it possible for A to ask B for some QoS
level and thus initiate
TE-LSP setup from B to C? How can A do this (I suppose, by means of RSVP
(rfc2205)).

Thank you in advance.

Alexander.