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Scheme for label switched path loop detection at node device

  • US 20020176370A1
  • Filed: 07/10/2002
  • Published: 11/28/2002
  • Est. Priority Date: 08/08/1997
  • Status: Active Grant
First Claim
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1. A node device for label switching entered packets by referring to an input label information capable of identifying a packet flow to be entered and a corresponding information for specifying at least an output side interface, the node device comprising:

  • a memory unit for storing a flow ID capable of network globally identifying a packet flow and an ingress node information regarding an ingress node of a label switched path, according to one label allocation message requesting a set up of the label switched path which is received from one previous hop node; and

    a judging unit for judging whether a label switched path loop is formed or not according to from which node another label allocation message that contains an identical flow ID and an identical ingress node information as said one label allocation message is received.

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