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Resource reservation protocol with traffic engineering point to multi-point label switched path hierarchy

  • US 7,787,380 B1
  • Filed: 08/22/2006
  • Issued: 08/31/2010
  • Est. Priority Date: 06/30/2006
  • Status: Active Grant
First Claim
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1. A method comprising:

  • establishing a first Resource Reservation Protocol with Traffic Engineering (RSVP-TE) Point to Multi-Point (P2MP) Label Switched Path (LSP) across a backbone domain between an upstream router and two or more downstream routers, wherein the upstream router is positioned between the downstream routers and a source of traffic for the first RSVP-TE P2MP LSP;

    receiving, with the upstream router, a Path message for a second RSVP-TE P2MP LSP established over two or more edge domains via the first RSVP-TE P2MP LSP within the backbone domain;

    sending a Path message from the upstream router to the downstream routers within the backbone domain to establish a P2MP LSP hierarchy with the first RSVP-TE P2MP LSP and the second RSVP-TE P2MP LSP, wherein the Path message sent by the upstream router to the downstream routers includes an upstream assigned label allocated by the upstream router for the second RSVP-TE P2MP LSP and a tunnel identifier that identifies the first RSVP-TE P2MP LSP to establish a P2MP LSP hierarchy;

    after establishing the first RSVP-TE P2MP LSP and the second RSVP-TE P2MP LSP as a P2MP LSP hierarchy, encapsulating a packet received on the second RSVP-TE P2MP LSP in the first RSVP-TE P2MP LSP using the upstream assigned label; and

    forwarding a single copy of the encapsulated packet from the upstream router to the downstream routers of the first RSVP-TE P2MP LSP within the backbone domain with the upstream assigned label.

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