Fault-protection mechanism for protecting multi-protocol-label switching (MPLS) capability within a distributed processor router operating in an MPLS network

  • US 6,915,445 B2
  • Filed: 05/08/2002
  • Issued: 07/05/2005
  • Est. Priority Date: 05/08/2002
  • Status: Active Grant
First Claim
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1. A method for providing fault-tolerance for Multi-Path Label Switching (MPLS) functionality in a multi-processor network routing node, comprising the steps of;

  • (a) implementing an MPLS server application including state information, on a first and a second processor in the node;

    (b) designating the MPLS server on the first processor as a master server and the MPLS server on the second processor as a backup server, and providing MPLS functionality in the node with the master MPLS server;

    (c) directing all required MPLS events to both the master and the backup MPLS servers during operation;

    (d) monitoring operation of the master server; and

    (e) in the event of failure of the master server, designating the backup server as the master, allowing MPLS functions to continue on the routing node;

    wherein, in step (d), monitoring is accomplished by a software distribution module (SDM) executing on a third processor in the node.

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