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Edge Node for a network domain

  • US 20100034090A1
  • Filed: 11/10/2006
  • Published: 02/11/2010
  • Est. Priority Date: 11/10/2006
  • Status: Active Grant
First Claim
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1. An edge node for a network domain that comprises at least one ingress node for receiving and routing data units belonging to a plurality of flows into said network domain, a plurality of interior routers for routing said data units through said network domain, and at least one egress node for routing said data units out of said network domain, at least one of said interior routers being arranged to detect whether it is subject to a congestion condition and to congestion mark routed data units if it is subject to said congestion condition, said edge node being arranged to act as said egress node and comprising:

  • a control element arranged for performing a congestion handling function that comprisesa detecting part, for detecting the presence of congestion marked data units arriving at said edge node,a reacting part for reacting to the detection of the presence of congestion marked data units by invoking a congestion control process that comprises;

    a) sending to said ingress node an instruction for terminating one or more flows to reduce a traffic load,b) waiting a predetermined period of time and then determining whether congestion marked data units are still arriving at said edge node, andc) if congestion marked data units are still arriving, repeating steps a) and b).

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