Telecommunication network with fast-reroute features

Details Telecommunication network with fast-reroute features Telecommunication network with fast-reroute features

2003-06-30

2008-05-13

Pham, Chi (Department: 2616)

Multiplex communications

Pathfinding or routing

C370S217000, C709S239000

Reexamination Certificate

active

07372845

ABSTRACT:
A telecommunication network with fast-reroute features wherein a method is used to release, by means of a “Path_Tear Message”, a Label Switched Path [LSP] established between linked routers (A, B, C, D, E). The routers are linked in cascade according to a Main Path (AB, BC, CD, DE) and are further linked in another order according to at least one Detour Path (ac, ce; bd). The Path_Tear Message includes a tag indicating, in each router, whether this Path_Tear Message should be immediately forwarded towards a downstream-located router or not. It is thereby possible to obtain a faster release of any unused Label Switched Path [LSP] than waiting for a timeout of 1 to 2 minutes, as it is currently the case.

REFERENCES:
patent: 2002/0112072 (2002-08-01), Jain
patent: 2003/0229807 (2003-12-01), Qiao et al.
Gan et al, “A Method for MPLS LSP Fast-Reroute Using RSVP Detours”, ′Online! Apr. 10, 2001, IETF, INET XP00224746.

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