3Com 5500-EI PWR Install Manual page 687

To do...
Enter system view
Enter Ethernet port
view
Configure queue
scheduling
A port of a Switch 5500-EI 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.
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.
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.
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.
The display queue-scheduler command cannot display the queue weight (or
bandwidth value) specified in Ethernet port view.
Use the command...
system-view
interface interface-type
interface-number
queue-scheduler { wfq
queue0-width queue1-width
queue2-width queue3-width
queue4-width queue5-width
queue6-width queue7-width | wrr
queue0-weight queue1-weight
queue2-weight queue3-weight
queue4-weight queue5-weight
queue6-weight queue7-weight }
1-25
Remarks
—
—
Required
By default, the queue
scheduling algorithm
adopted on all the ports is
WRR. The default weights
of the eight output queues
of a port are 1, 2, 3, 4, 5, 9,
13, and 15 (in the order
queue 0 through queue 7).