Soft preemption feedback

Details Soft preemption feedback Soft preemption feedback

2008-04-15

2008-04-15

Pham, Chi (Department: 2616)

Multiplex communications

Pathfinding or routing

Switching a message which includes an address header

C370S229000, C370S230000, C370S230100, C370S231000, C370S232000, C370S233000, C370S234000, C370S410000, C370S408000, C370S412000, C370S400000, C370S392000

Reexamination Certificate

active

07359386

ABSTRACT:
Systems and methods for preemption of Traffic Engineering LSPs such that preemption decisions are made in a coordinated fashion along the path of a new LSP and computation of a new path for a preempted LSP can take advantage of knowledge of newly unavailable links. The efficiency of the preemption mechanism is greatly increased and the undesirable effects of heterogeneous preemption decisions are limited. The amount of signaling may also be significantly reduced. In one implementation, these advantages are achieved by exploiting an upstream preemption feedback mechanism that uses an incremental timer to delay preemption decisions until feedback is available.

REFERENCES:
patent: 2002/0141345 (2002-10-01), Szviatovszki et al.
patent: 2003/0067880 (2003-04-01), Chiruvolu
patent: 2003/0185217 (2003-10-01), Ganti et al.
Awduche et al., “Requirements for Traffic Engineering Over MPLS,” RFC 2702, Internet Engineering Task Force, Sep. 1999.
Awduche et al., “RSVP-TE: Extensions to RSVP for LSP Tunnels,” RFC 3209, Internet Engineering Task Force, Dec. 2001.
Berger et al., “Generalized MPLS Signaling—RSVP-TE Extensions,” RFC 3473, Internet Engineering Task Force, Jan. 2003.
Braden et al., “Resource ReSerVation Protocol (RSVP)—Version 1 Functional Specification,” RFC 2205, Internet Engineering Task Force, Sep. 1977.
Le Faucheur et al., “Requirements for Support of Diff-Serv-Aware MPLS Traffic Engineering,” RFC 3564, Internet Engineering Task Force,Jul. 2003.
Meyer et al., “MPLS Traffic Engineering Soft Preemption,” Internet Draft, Internet Engineering Task Force, Feb. 2003.
Pan et al., “Fast Reroute Extensions to RSVP-TE for LSP Tunnels,” Internet Draft, Internet Engineering Task Force, Dec. 2003.
E. Rosen et al., Multiprotocol Label Switching Architecture, RFC 3031, Internet Engineering Task Force, Jan. 2001.
Vasseur et al., “Definition of an RRO Node-ID Subobject,” Internet Draft, Internet Engineering Task Force, May 2003.

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