Label switched routing system and method

Details Label switched routing system and method Label switched routing system and method

2006-01-03

2006-01-03

Hsu, Alpus H. (Department: 2665)

Multiplex communications

Pathfinding or routing

Switching a message which includes an address header

C370S400000, C370S428000

Reexamination Certificate

active

06982977

ABSTRACT:
A packet routing/switching system and method are provided by which label switched routing is performed within a hierarchy of LSP/FA-LSPs defined/provisioned in a network of interconnected nodes. Rather than transmitting an entire label stack with an LSP label for each LSP/FA-LSP in the hierarchy, at a given node in the network, a single LSP label is transmitted together with a components label which contains a list of component identifiers which do not inherently identify LSP/FA-LSPs, but from which the full LSP/FA-LSP labels can be determined locally at each node using previously distributed information described in detail below. The list of component identifiers is a shorthand way identifying to adjacent nodes the identity of the LSP/FA-LSP hierarchy without transmitting the entire LSP labels and thus significantly reducing overhead. The single label which is transmitted is the label of the LSP/FA-LSP of which the given node forms a part.

REFERENCES:
patent: 2002/0172155 (2002-11-01), Kasvand-Harris et al.
patent: 2003/0043792 (2003-03-01), Carpini et al.
patent: 2004/0057424 (2004-03-01), Kokkonen

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