Brocade Communications Systems 53-1001761-01 Scheduling the QoS queue

104 Converged Enhanced Ethernet Administrator’s Guide
53-1001761-01
Scheduling
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DRAFT: BROCADE CONFIDENTIAL
Figure 12 shows that extending the frame scheduler to a hybrid SP+WRR system is fairly
straightforward. All SP queues are considered strictly higher priority than WRR so they are serviced
first. Once all SP queues are drained, then the normal WRR scheduling behavior is applied to the
non-empty WRR queues.
FIGURE 12 Strict priority and Weighted Round Robin scheduler
Scheduling the QoS queue
Perform the following steps from Privileged EXEC mode specify the schedule to use.
1. Enter global configuration mode.
switch#configure terminal
2. Specify the schedule to use and the traffic class to bandwidth mapping.
switch(config)#qos queue scheduler strict-priority 4 dwrr 10 20 30 40
Example of setting the traf fic class frame scheduler for 4 Strict Priority Traffic Class and 4 DWRR Traffic Class
with Traffic Class 0 getting 10 percent bandwidth, Traffic Class 1 getting 20 percent bandwidth, Traffic Class
2 getting 30 percent bandwidth, and Traffic Class 3 getting 40 percent bandwidth.
switch:admin>cmsh
switch>enable
switch#configure terminal
Enter configuration commands, one per line. End with CNTL/Z.
switch(config)#qos queue scheduler strict-priority 4 dwrr 10 20 30 40
switch(config)#end
3. Enter the copy comman d to save the running-conf ig file to the start up-config file.
switch#copy running-config startup-config
TABLE 19 Supported scheduling configurations
Traffic Class SP0 SP1 SP2 SP3 SP4 SP5 SP6 SP8
7 W RR8 SP1 SP2 SP3 SP4 SP5 SP6 SP8
6 WRR7 WRR7 SP1 SP2 SP3 SP4 SP5 SP7
5 WRR6 WRR6 WRR6 SP1 SP2 SP3 SP4 SP6
4 WRR5 WRR5 WRR5 WRR5 SP1 SP2 SP3 SP5
3 WRR4 WRR4 WRR4 WRR4 WRR4 SP1 SP2 SP4
2 WRR3 WRR3 WRR3 WRR3 WRR3 WRR3 SP1 SP3
1 WRR2 WRR2 WRR2 WRR2 WRR2 WRR2 WRR2 SP2
0 WRR1 WRR1 WRR1 WRR1 WRR1 WRR1 WRR1 SP1