Dell PowerEdge M520 Dell Converged Enhanced Ethernet Administrator's Guide - Page 124
Multicast queue scheduling, Scheduling the QoS queue
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10 Scheduling Figure 9 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 9 Strict priority and Weighted Round Robin scheduler Scheduling the QoS queue To specify the schedule to use, perform the following steps from Privileged EXEC mode. 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 The following example sets the traffic 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 command to save the running-config file to the startup-config file. switch#copy running-config startup-config Multicast queue scheduling The multicast traffic classes are numbered from 0 to 7; higher numbered traffic classes are considered higher priority. A fixed mapping from multicast traffic class to equivalent unicast traffic class is applied to select the queue scheduling behavior. Table 21 presents the multicast traffic class equivalence mapping applied. TABLE 21 Multicast traffic class equivalence mapping Multicast traffic class Equivalent unicast traffic class 0 0 1 1 2 2 106 Dell Converged Enhanced Ethernet Administrator's Guide 53-1002116-01