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Dynamic retrieval of routing information for inter-AS TE-LSPs

  • US 20060209716A1
  • Filed: 03/15/2005
  • Published: 09/21/2006
  • Est. Priority Date: 03/15/2005
  • Status: Active Grant
First Claim
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1. A method for dynamically triggering an exchange of reachability information between a target node of a traffic engineering (TE) label switched path (LSP) and a head-end node of the TE-LSP in a computer network, the method comprising:

  • establishing a TE-LSP from the head-end node in a local domain to a tail-end node in a remote domain;

    triggering, from the head-end node in response to establishing the TE-LSP, the target node to establish a border gateway protocol (BGP) session with the head-end node;

    transmitting reachability information of the tail-end node from the target node to the head-end node through the BGP session;

    calculating, at the head-end node, routes reachable from the tail-end node using the reachability information; and

    inserting the calculated routes into a routing table of the head-end node.

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