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Method and apparatus for fast distributed restoration of a communication network

  • US 6,549,513 B1
  • Filed: 10/12/1999
  • Issued: 04/15/2003
  • Est. Priority Date: 10/12/1999
  • Status: Expired due to Term
First Claim
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1. A method for distributed restoration in an optical mesh having a plurality of nodes, comprising the steps of:

  • at periodic intervals, updating a spare link database, wherein the spare link database includes information relating to spare links between each node and adjacent nodes in the optical mesh network and availability of the spare links for restoration;

    at periodic intervals, updating a restoration route database for each node in the optical mesh network, wherein the step of updating a restoration route database comprises the steps of;

    transmitting a probe message by each node to be forward through the optical network, wherein the probe message includes an indentification of a source node and a maximum number of hops allowed in a restoration path; and

    receiving the probe message by the source node, wherein the probe message includes a node list comprised of a node identification appended by each successive forwarding node that can be used as a complete restoration route and number of spare links along the restoration route, wherein the node list includes less than or equal to the maximum number of hops allowed in the restoration path; and

    in response to detection of a fault in a working link, selecting a restoration route from the restoration route database and establishing the restoration route in the optical network.

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