Methods and apparatus for implementing bi-directional signal...

Details Methods and apparatus for implementing bi-directional signal... Methods and apparatus for implementing bi-directional signal...

2006-06-13

2006-06-13

Chin, Wellington (Department: 2664)

Multiplex communications

Pathfinding or routing

Switching a message which includes an address header

C370S389000

Reexamination Certificate

active

07061921

ABSTRACT:
Methods and apparatus for implementing bi-directional logical signal interfaces (LSIs) in communications systems which use uni-directional label switched paths (LSPs), e.g., MPLS networks, are described. To implement an LSI, two uni-directional LSPs between the same end points, e.g., routers, and extending in opposite directions, are associated together. The association of LSPs may be done by setting LSI configuration information in the routers at both ends of an LSI. Each router at the end of an LSI serves as an egress router for one of the LSPs associated with the LSI and an ingress router for the other LSP associated with the LSI. To enable an egress router to determine which, if any, LSI a packet or message corresponds to, a real as opposed to a null label is used when sending packets over an LSI LSP to an LSI LSP egress router.

REFERENCES:
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patent: 2001/0019554 (2001-09-01), Nomura et al.
patent: 2002/0054405 (2002-05-01), Guo et al.
patent: 2003/0158965 (2003-08-01), Koester

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