H3C Technologies H3C S3600 Series Switches - Manual (Page 752)

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A port of an S3600 Ethernet switch supports eight output queues. These queue scheduling algorithms
are available: SP, WRR, and WFQ. With WRR (or WFQ) adopted, if you set the weight or the bandwidth
of one or multiple queues to 0, the switch will add the queue or these queues to the SP group, where SP
is adopted. For other queues, WRR (or WFQ) still applies. In this case, both SP and WRR (or WFQ) are
adopted.
In cases where both SP and WRR (or WFQ) queue scheduling algorithms are adopted, the queues in
the SP group take precedence over other queues. For example, if queue 0, queue 1, queue 2, and
queue 3 are in the SP group, queue 4, queue 5, queue 6, and queue 7 are scheduled using WRR (or
WFQ), the switch will schedule the queues in the SP group preferentially by using the SP algorithm.
Then queues outside the SP group are scheduled by using WRR (or WFQ) algorithm only when all the
queues in the SP group are empty.
z The queue scheduling algorithm specified by using the queue-scheduler command in system
view takes effect on all the ports. The queue scheduling algorithm configured in port view must be
the same as that configured in system view. Otherwise, the system prompts configuration errors.
z If the weight (or bandwidth value) specified in system view for a queue of WRR queuing or WFQ
queuing cannot meet the requirement of a port, you can modify the weight (or bandwidth value) for
this port in the corresponding Ethernet port view. The new weight (or bandwidth value) takes effect
only on the port.
z If the weight (or bandwidth value) specified in system view for a queue of SP-WRR queuing or
SP-WFQ queuing in the command cannot meet the requirement of a port, you can modify the
weight (or bandwidth value) for this port in the corresponding Ethernet port view. The new weight
(or bandwidth value) takes effect only on the port.
z The display queue-scheduler command cannot display the queue weight (or bandwidth value)
specified in Ethernet port view.
Configuration example
z Adopts WRR for queue scheduling, setting the weights of the output queues to 2, 2, 3, 3, 4, 4, 5,
and 5 (in the order queue 0 through queue 7).
z Verify the configuration.
Configuration procedure:
system-view
[Sysname] queue-scheduler wrr 2 2 3 3 4 4 5 5
[Sysname] display queue-scheduler
Queue scheduling mode: weighted round robin
weight of queue 0: 2
weight of queue 1: 2
weight of queue 2: 3
weight of queue 3: 3
weight of queue 4: 4
weight of queue 5: 4
weight of queue 6: 5