Operation Manual – QoS-QoS ProfileH3C S5600 Series Ethernet Switches Chapter 1 QoS Configuration1-14Figure 1-7 Diagram for WRR queuingWRR queue-scheduling algorithm schedules all the queues in turn and every queuecan be assured of a certain service time.In a typical H3C switch there are eight output queues on each port. WRR configures aweight value for each queue, for example: w7, w6, w5, w4, w3, w2, w1, and w0respectively for queue 7 through queue 0. A weight value indicates the proportion ofresources available for a queue. On a 100-Mbps port, configure the weight value ofWRR queue-scheduling algorithm to 5, 5, 3, 3, 1, 1, 1, and 1 (corresponding to w7, w6,w5, w4, w3, w2, w1, and w0 in order). In this way, the queue with the lowest priority canget 5 Mbps (100 Mbps × 1/(5+5+3+3+1+1+1+1)) bandwidth at least, and thedisadvantage of SP queue-scheduling that the packets in queues with lower prioritymay not get service for a long time is avoided. Another advantage of WRR queue is that: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, thebandwidth resources are made full use.1.3.10 Flow-Based Traffic AccountingThe function of flow-based traffic accounting is to use ACL rules in traffic classificationand perform traffic accounting on the packets matching the ACL rules. You can get thestatistics of the packets you are interested in through this function.1.3.11 BurstThe Burst function can provide better packet cache function and traffic forwardingperformance. It is suitable for networks wherez Large amount of broadcast/multicast packets and large burst traffic exist.
