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QoS Fairness with RED


















                         What QoS does RED provide?                                                                  WRED (Weighted RED)
                     • Lower buffer delay: good                                                           • WRED provides separate

                         interactive service keeping Qavg                                                     thresholds and weights for

                         small                                                                                different IP precedences, allowing
                     • Given responsive flows: packet                                                         us to provide different QoS to

                         dropping reduced and early                                                           different traffic

                         congestion indication allows traffic                                             • Lower priority class traffic may be
                         to throttle back before congestion                                                   dropped more frequently than

                     • RED provide small delay, small                                                         higher priority traffic during

                         packet loss, and high throughput                                                     periods of congestion
                         (with responsive flows)












                                                                     Application QoS for assured delivery

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