Quick Reference Guide

PowerConnect B-Series TI24X Configuration Guide 415
53-1002269-02
Scheduling
15
By default, when you select the combined SP and WRR queueing method, the device assigns
strict priority to traffic in qosp7 and qosp6, and weighted round robin priority to traffic in qosp0
through qosp5. Thus, the device schedules traffic in queue 7 and queue 6 first, based on the
strict priority queueing method. When there is no traffic in queue 7 and queue 6, the device
schedules the other queues in round-robin fashion from the highest priority queue to the
lowest priority queue.
By default, when you specify the combined SP and WRR queuing method, the system balances
the traffic among the queues as shown in Table 65. If desired, you can change the default
bandwidth values as instructed in the section “Changing the bandwidth allocations of the
hybrid WRR and SP queues” on page 417.
Selecting the QoS queuing method
By default, devices use the weighted fair queuing method of packet prioritization. To change the
method to strict priority or back to weighted fair queuing, enter the following command at the
Global CONFIG level of the CLI.
PowerConnect(config)#qos mechanism strict
To change the method back to weighted round robin, enter the following command.
PowerConnect(config)#qos mechanism weighted
Syntax: [no] qos mechanism strict | weighted
To change the queuing mechanism to the combined SP and WRR method, enter the following
command at the Global CONFIG level of the CLI.
PowerConnect(config)#qos mechanism mixed-sp-wrr
Syntax: mechanism mixed-sp-wrr
Configuring the QoS queues
Each of the queues has the following configurable parameters:
• The queue name
• The minimum percentage of a port outbound bandwidth guaranteed to the queue
TABLE 65 Default bandwidth for combined SP and WRR queueing methods
Queue Default bandwidth
qosp7 Strict priority (highest priority)
qosp6 Strict priority
qosp5 25%
qosp4 15%
qosp3 15%
qosp2 15%
qosp1 15%
qosp0 15% (lowest priority)