Link-level protection of traffic in a packet-switched network

  • US 6,901,048 B1
  • Filed: 06/26/2000
  • Issued: 05/31/2005
  • Est. Priority Date: 08/20/1999
  • Status: Expired due to Fees
First Claim
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1. A method of routing packets intended to be transmitted across a network link protected by a protection path defined by a closed loop of nodes and links through the network, the method comprising the steps of:

  • determining whether the protected link has failed; and

    if the protected link has not failed, sending the packets across the protected link;

    otherwise, encapsulating the packets within tunnel packets and sending the tunnel packets along the protection path; and

    wherein each packet comprises a header specifying the identity of a source node and a destination node associated with the packet and the source and destination nodes associated with each tunnel packet correspond to the nodes at either end of the protected link.

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