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Indirect measurement methodology to infer routing changes using statistics of flow arrival processes

  • US 8,165,019 B2
  • Filed: 07/14/2009
  • Issued: 04/24/2012
  • Est. Priority Date: 07/14/2009
  • Status: Active Grant
First Claim
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1. A method for detecting routing changes in a packet-switched network, the method comprising:

  • in a packet flow analyzer connected to a router, monitoring packet flows traversing the router, wherein all packets of a packet flow are destined for the same destination;

    in a computer connected for receiving data generated by the monitoring of the packet flows, statistically determining that a frequency of packet flows traversing a particular interface of the router has changed, including statistically detecting a decrease of flows to a particular destination; and

    based on a determination that the frequency of packet flows traversing the particular interface of the router has changed, reporting a removal of the router from a route to the particular destination.

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