A New Internet-Draft is available from the on-line Internet-Drafts directories.
Title : Distributed Route Exchangers
Author(s) : C. Lee, S. Ghanti, A. Celer, G. Ash
Filename : draft-lee-mpls-te-exchange-02.txt
Pages : 19
Date : 03-Jul-02
The current link state routing protocols flood link states to all
routers so that routers have the information required to compute the
shortest paths to route packets on a hop by hop basis. However, for
the purpose of establishing MPLS paths, constraint path computation
is only performed at certain nodes, for instance, at the node where
path setup is triggered or at the head-end of a loosely routed
segment that crosses a network (or area) boundary. In addition, it
not possible to have all required constraints present in all nodes in
a network, nor is it always feasible for nodes setting up paths to
compute the constraint paths themselves, a notable example is when a
path traverses network or area boundary. These reasons motivate a
solution using a 'subset' of routers (called route exchangers), to
collect constraint information and exchange it with other route
exchangers. Route exchangers store traffic engineering link states
and other types of constraint information and compute on demand, the
explicit routes required by routers establishing paths. Hence, link
state information need only be distributed to the subset of nodes
that help compute constraint paths in the network.
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