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Loop prevention techniques using encapsulation manipulation of IP/MPLS field

  • US 7,477,593 B2
  • Filed: 04/04/2005
  • Issued: 01/13/2009
  • Est. Priority Date: 04/04/2005
  • Status: Active Grant
First Claim
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1. A method for performing fast reroute (FRR) operations at the edge of a computer network, the network having first and second edge devices coupled to a neighboring routing domain, the method comprising:

  • detecting a loss of communication between the first edge device and the neighboring routing domain;

    receiving a data packet at the first edge device, the received data packet containing a destination address that is reachable via the neighboring routing domain;

    determining whether the received data packet contains a FRR identifier value in at least one of its encapsulation headers, the FRR identifier value indicating that the received packet was previously rerouted in accordance with FRR operations;

    if the received data packet does not contain the FRR identifier value, rerouting the received data packet to the second edge device for forwarding to the neighboring routing domain; and

    if the received data packet does contain the FRR identifier value, dropping the received packet, to prevent loops from developing at the edge of the computer network.

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