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Constraint-based shortest path first method for dynamically switched optical transport networks

  • US 7,324,453 B2
  • Filed: 12/16/2002
  • Issued: 01/29/2008
  • Est. Priority Date: 08/30/2002
  • Status: Active Grant
First Claim
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1. A traffic network element (“

  • TNE”

    ) in a network, the TNE comprising;

    a traffic engineering network database (“

    TEND”

    ) that stores network topology information for the network and bandwidth availability information for links in the network;

    a routing engine that receives a request for a label switched path (“

    LSP”

    ) through the network with specified constraints, processes network topology information from the TEND to create a network graph comprising links meeting the specified constraints, and computes a primary path through the network, wherein the primary path comprises links selected from the network graph; and

    wherein if two or more links have the same cost, the one of the links having the greatest number of data-bearing channels is selected to comprise a portion of the primary path.

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