TP-Link T3700G-28TQ T3700G-28TQ V1 UG - Page 258
follow the WRR mode. In SP+WRR mode, TC7 is in the SP group; TC0, TC1, TC2 to TC6
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Figure 12-4 SP-Mode 2. WRR-Mode: Weight Round Robin Mode. In this mode, packets in all the queues are sent in order based on the weight value for each queue and every queue can be assured of a certain service time. The weight value indicates the occupied proportion of the resource. WRR queue overcomes the disadvantage of SP queue that the packets in the queues with lower priority can not get service for a long time. In WRR mode, though the queues are scheduled in order, the service time for each queue is not fixed, that is to say, if a queue is empty, the next queue will be scheduled. In this way, the bandwidth resources are made full use of. The default weight value ratio of TC0, TC1, TC2, TC3, TC4, TC5, TC6 and TC7 is 1:2:4:8:16:32:64:128. Figure 12-5 WRR-Mode 3. SP+WRR-Mode: Strict-Priority + Weight Round Robin Mode. In this mode, this switch provides two scheduling groups, SP group and WRR group. Queues in SP group and WRR group are scheduled strictly based on strict-priority mode while the queues inside WRR group follow the WRR mode. In SP+WRR mode, TC7 is in the SP group; TC0, TC1, TC2 to TC6 belong to the WRR group and the weight value ratio of TC0, TC1, TC2 to TC6 is 1:2:4:8:16:32:64. In this way, when scheduling queues, the switch allows TC7 to occupy the whole bandwidth following the SP mode and the TC0, TC1, TC2 to TC6 in the WRR group will take up the bandwidth according to their ratio 1:2:4:8:16:32:64. 4. Equ-Mode: Equal-Mode. In this mode, all the queues occupy the bandwidth equally. The weight value ratio of all the queues is 1:1:1:1:1:1:1:1. The QoS module is mainly for traffic control and priority configuration, including three submenus: DiffServ, Bandwidth Control and Voice VLAN. 247