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Automation fallback to P2P LSPs for MLDP built multipoint-trees

  • US 8,948,170 B2
  • Filed: 01/30/2012
  • Issued: 02/03/2015
  • Est. Priority Date: 11/04/2005
  • Status: Active Grant
First Claim
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1. A method comprising:

  • a core router receiving a stacked label multicast packet from a first edge router via a point-to-point label switched path (LSP), whereinthe stacked label multicast packet comprisesa multicast packet,a top label associated with the point-to-point LSP, anda bottom label associated with a point-to-multipoint LSP;

    selecting whether to pop or swap the top label from the stacked label multicast packet, wherein the selecting comprises;

    the core router popping the top label from the stacked label multicast packet to produce a labeled multicast packet, if the core router is the penultimate router of the point-to-point LSP from the first edge router to an ultimate router;

    the core router swapping the top label for a new top label to produce the labeled multicast packet, if the core router is not the penultimate router; and

    the core router transmitting the labeled multicast packet to a second edge router via the point-to-multipoint LSP.

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