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Network auto-provisioning and distributed restoration

  • US 6,763,190 B2
  • Filed: 01/05/2001
  • Issued: 07/13/2004
  • Est. Priority Date: 03/03/2000
  • Status: Expired due to Term
First Claim
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1. At a node of a telecommunications network satisfying a demand from a start node to an end node, a method for automatically provisioning the network from a service path to a restoration path after a failure occurs in the service path, comprising the steps of:

  • (a) receiving, at the node, an indication of the occurrence of the failure in the service path;

    (b) if the node is an intermediate node of the service path, then transmitting, by the node, a failure message to its next node along the service path;

    (c) if the node is the end node of the service path, then transmitting, by the node, a restore message to its previous node along the restoration path; and

    (d) if the node is an intermediate node of the restoration path, then transmitting, by the node, a restore message to its previous node along the restoration path, such that, upon the occurrence of the failure in the service path, where the restoration path comprises the start node, one or more restoration-path intermediate nodes that are not part of the service path, and the end node;

    upon receipt of the indication of the occurrence of the failure, the end node (1) transmits a failure message to a last restoration-path-intermediate node and (2) reconfigures its cross-connect to support the restoration path;

    upon receipt of the failure message from the end node, the last restoration-path intermediate node (1) transmits a failure message to its previous node along the restoration path and (2) reconfigures its cross-connect to support the restoration path;

    upon receipt of the failure message from a first restoration-path intermediate node, the start node reconfigures its cross-connect to support the restoration path, such that the demand is restored based on a sequence of communications in reverse direction along the restoration path from the end node to the start node.

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