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Adaptive marking for WRED with intra-flow packet priorities in network queues

  • US 9,680,760 B2
  • Filed: 07/16/2013
  • Issued: 06/13/2017
  • Est. Priority Date: 07/16/2013
  • Status: Active Grant
First Claim
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1. A method, comprising:

  • receiving, at a network device, a packet;

    determining, by the network device, an intra-flow packet priority level of the packet, wherein the intra-flow packet priority level is a priority of the packet within a particular flow in relation to other packets in the particular flow and intra-flow priority distribution is different across received flows at the network device;

    mapping, by the network device, the intra-flow packet priority level to a weighted random early detection (WRED) marking based on running statistics of intra-flow packet priority levels across received flows;

    marking, by the network device, the packet with the mapped WRED marking to normalize intra-flow priority markings for WRED in a manner that is adaptive to traffic characteristics of each received flow;

    placing, by the network device, the marked packet into an outgoing network queue for transmission; and

    forwarding or dropping the marked packet by the network device based on the network queue, wherein the received flows have equal per-flow packet drop rates and thresholds among packets in different flows, and each particular flow of the received flows has different packet drop rates and thresholds among packets inside each particular flows, respectively.

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