Operation Manual – QoS-QoS Profile
H3C S5600 Series Ethernet Switches
Chapter 1 QoS Configuration
1-14
Figure 1-7
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.
In a typical H3C switch there are eight output queues on each port. WRR configures a
weight value for each queue, for example: w7, w6, w5, w4, w3, w2, w1, and w0
respectively for queue 7 through queue 0. A weight value indicates the proportion of
resources available for a queue. On a 100-Mbps port, configure the weight value of
WRR 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 can
get 5 Mbps (100 Mbps × 1/(5+5+3+3+1+1+1+1)) bandwidth 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.
1.3.10 Flow-Based Traffic Accounting
The function of flow-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.
1.3.11 Burst
The Burst function can provide better packet cache function and traffic forwarding
performance. It is suitable for networks where
z
Large amount of broadcast/multicast packets and large burst traffic exist.