Fast reroute for multiple label switched paths sharing a...

Details Fast reroute for multiple label switched paths sharing a... Fast reroute for multiple label switched paths sharing a...

2009-02-24

2011-12-13

Shah, Chirag (Department: 2477)

Multiplex communications

Pathfinding or routing

Switching a message which includes an address header

C370S401000

Reexamination Certificate

active

08077726

ABSTRACT:
Techniques are described for maintaining a forwarding information base (FIB) within a packet-forwarding engine (PFE) of a router, and programming a packet-forwarding integrated circuit (IC) with a hardware version of the FIB. Entries of the hardware version identify primary forwarding next hops and backup forwarding next hops for the LSPs, wherein the packet-forwarding IC includes a control logic module and internal selector block configured to produce a value indicating a state of the first physical link. The selector block outputs one of the primary forwarding next hop and the backup forwarding next hop of the entries for forwarding the MPLS packets based on the value in response to the packet-processing engine addressing one of the entries of the FIB for the LSPs. Packets are forwarded with the PFE to the one of the primary forwarding next hop and the backup forwarding next hop output by the selector block.

REFERENCES:
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patent: 6976154 (2005-12-01), Dyckerhoff et al.
patent: 2003/0099218 (2003-05-01), Tillotson
patent: 2006/0126496 (2006-06-01), Filsfils et al.
U.S. Appl. No. 11/056,383, filed Feb. 10, 2005 entitled, “Fast Reroute of Traffic Associated With a Point to Multi-Point Network Tunnel,” Aggarwal.
P. Pan et al., “Fast Reroute Extensions to RSVP-TE for LSP Tunnels,” Network Working Group, RFC 4090, May 2005, 36 pgs.

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