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Local information-based restoration arrangement

  • US 6,947,376 B1
  • Filed: 10/21/1999
  • Issued: 09/20/2005
  • Est. Priority Date: 10/21/1999
  • Status: Expired due to Fees
First Claim
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1. A communication network that includes nodes Np, p=1, 2, 3 . . . and link bundles Lpq, q=1, 2, 3 . . . that interconnect nodes p and q, where said link bundles are carried over physical physical spans of transmission facilities, the improvement comprising:

  • a neighborhood Mp associated with each node Np, wherein neighborhood Mp may be different in size from neighborhood Mp, where size of a neighborhood designates number of hops included in the neighborhood; and

    node Np comprises a processing module that receives information about spare capacity in neighborhood Mp and maintains a set of re-route plans that affect neighborhood Mp, or pointers to such plans wherein said processing module, upon receiving information of a failure condition of a type for which node Np is a backup node for purposes of re-routing, triggers execution of a pre-planned re-routing plan to bypass said failure condition when, in response to a query of a node Nq that is a control node for said failure condition, node Np determines that node Nq will not trigger said execution of said pre-planned re-routing plan.

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