3Com Switch 4500 Family Manual page 516

4
5
6
7
A port of a Switch 4500 supports eight output queues, to which these queue scheduling algorithms are
applicable: 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 device 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.
Note that:
The queue scheduling algorithm specified by executing 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 will prompt configuration errors.
For example, if you configure queues 0 and 2 to adopt SP and queues 3 through 7 to adopt WRR
in system view, you can modify the weights of queues 3 through 7 in port view but cannot modify
the queue scheduling algorithm of any queue in port view.
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 while the weights on the other ports remain as set in system view.
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 weights (or bandwidth values)
specified in Ethernet port view. To do that, use the display this command in the corresponding
port view or the display current-configuration interface command in any view. Note that the two
commands display the queue scheduling configuration only when the configuration of a port is
different from the global configuration.
Related commands: display queue-scheduler.
Examples
# Configure WRR as the queuing algorithm and set the weights of queues 0 through 7 to 2, 2, 4, 4, 6, 6,
8, and 8 globally in system view.
<Sysname> system-view
System View: return to User View with Ctrl+Z.
[Sysname] queue-scheduler wrr 2 2 4 4 6 6 8 8
# Configure Ethernet 1/0/1 to adopt the WRR queue scheduling algorithm, setting the weights of queue
0 through queue 7 to 1, 2, 3, 4, 5, 6, 7, and 8.
Queue ID
5
9
13
15
1-19
Weight