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Self-bootstrapping BFD session over MPLS LSP

  • US 20160036695A1
  • Filed: 08/04/2014
  • Published: 02/04/2016
  • Est. Priority Date: 08/04/2014
  • Status: Active Grant
First Claim
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1. A method implemented by a network device in a network implementing penultimate hop popping (PHP) for Internet Protocol (IP)/Multi-Protocol Label Swapping (MPLS), the network having a plurality of nodes, the method to establish a bi-directional forwarding detection (BFD) session between an active node and a passive node of an MPLS label switched path (LSP) without an out of band bootstrapping process, where the network device is the passive node, the method comprising the steps of:

  • receiving an MPLS packet including a BFD control packet, a source label and a source label indicator;

    accessing the My Discriminator of the BFD control packet, Your Discriminator of the BFD control packet and the source label of the MPLS packet;

    checking whether a BFD session exists with the Your Discriminator;

    looking up whether the source label is known, where no BFD session exists with the Your Discriminator;

    looking up whether the My Discriminator is known, where the source label is known;

    generating a My Discriminator for the passive node, where the source label is known and the My Discriminator is not known;

    establishing the BFD session for a forwarding equivalency class (FEC) identified in the source label; and

    sending a second BFD control packet in a second MPLS packet to the active node, where the second BFD control packet includes the generated My discriminator for the passive node.

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