Backbone Diffserv Configuration (3):mDRR Tuning

• Using MQC, can specify bandwidth in %

• For legacy mDRR configuration, tuning is a little more complicated:

  mDRR queue quantum = MTU (4470) + (w – 1) * 512
  
  If wbus = 73, quantumbus = MTU + 72 * 512 = 41334 bytes
  If wint = 1, quantumint = MTU = 4470 bytes
  Bus share = 41334 / (41334+4470) = 90%

• mDRR smallest weight should be as small as possible to ensure minimum latency between two consecutive services of the same queue

  BE queue is set to w = 1
  

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