Operation Manual – QoS-QoS Profile
H3C S3100 Series Ethernet Switches
Chapter 1 QoS Configuration
1-15
Figure 1-8
Diagram for WRR queuing
WRR queue-scheduling algorithm schedules all the queues in turn and every queue
can be assured of a certain service time. Assume there are four output queues on a
port. WRR configures a weight value for each queue, which is w3, w2, w1, and w0 for
queue 3 through queue 0. The weight value indicates the proportion of obtaining
resources. On a 100 M port, configure the weight value of WRR queue-scheduling
algorithm to 5, 3, 1, and 1 (corresponding to w3, w2, w1, and w0 in order). In this way,
the queue with the lowest priority can get 10 Mbps bandwidth (100-Mbps × 1/ (5 + 3 + 1
+ 1)) at least, and the disadvantage of SP queue-scheduling that the packets in queues
with lower priority may 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, the bandwidth resources are made full use.
3) HQ-WRR
queuing
HQ-WRR is an improvement over WRR. Assume there are four priority queues on a
port and queue 3 allocated with the highest priority, the switch will ensure that this
queue get served first and will perform round-robin scheduling to the other three
queues when the traffic has exceeded the bandwidth capacity of a port.
1.3.8 Flow-Based Traffic Accounting
The function of traffic-based traffic accounting is to use ACL rules in traffic classification
and perform traffic accounting on the packets matching the ACL rules. You can get the
statistics of the packets you are interested in through this function.
1.3.9 Burst
The Burst function can provide better packet cache function and traffic forwarding
performance. It is suitable for networks where
