Method and apparatus using multiprotocol label switching (MPLS) label distribution protocol (LDP) to establish label switching paths (LSPS) for directed forwarding
First Claim
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1. A method of providing fast rerouting in a network comprising:
- assigning a first local label for a prefix;
assigning a second local label for said prefix;
advertising said first local label to an upstream peer; and
advertising said second local label to a downstream peer.
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Abstract
A method and apparatus method for providing fast rerouting in a network is presented. The method and apparatus assign a first local label for a prefix, and assign a second local label for the prefix. The first local label is advertised to an upstream peer and the second local label is advertised to a downstream peer. A forwarding entry from the first local label for a prefix is switched to the second local label for the prefix when a failure of a link or next hop is detected.
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Citations
24 Claims
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1. A method of providing fast rerouting in a network comprising:
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assigning a first local label for a prefix;
assigning a second local label for said prefix;
advertising said first local label to an upstream peer; and
advertising said second local label to a downstream peer. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A computer system comprising:
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a memory;
a processor;
a communications interface;
an interconnection mechanism coupling the memory, the processor and the communications interface; and
wherein the memory is encoded with an application that when performed on the processor, provides a fast rerouting process for processing information, the process causing the computer system to perform the operations of;
assigning a first local label for a prefix;
assigning a second local label for said prefix;
advertising said first local label to an upstream peer; and
advertising said second local label to a downstream peer. - View Dependent Claims (12, 13, 14, 15, 16, 17, 18, 19, 20)
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21. A system providing fast rerouting in a network comprising:
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means for assigning a first local label for a prefix;
means for assigning a second local label for said prefix;
means for advertising said first local label to an upstream peer;
means for advertising said second local label to a downstream peer; and
means for switching a forwarding entry from said first local label for said prefix to said second local label for said prefix when a failure of a link or next hop is detected. - View Dependent Claims (22, 23, 24)
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Specification