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Router switches to old routing table when communication failure caused by current routing table and investigates the cause of the failure

  • US 6,625,659 B1
  • Filed: 01/18/2000
  • Issued: 09/23/2003
  • Est. Priority Date: 01/18/1999
  • Status: Expired due to Term
First Claim
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1. A router apparatus comprising:

  • a plurality of routing tables into which new route information is stored every time route information is changed;

    a rewriting time saving unit for saving rewriting time information of said plurality of routing tables;

    a table switching unit for switching said plurality of routing tables; and

    a route processor unit for managing, for example, setting/rewriting/deleting the routing table based upon route information supplied by a network operator, or route information obtained from routing protocol, wherein when a communication failure caused by the routing table occurs, said failed routing table is switched to another routing table into which old route information has been stored so as to continue the communication, and also, a communication failure reason is investigated by comparing the route information before/after said failed routing table is switched.

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