Table of Contents
Advertisement
10
Scheduling
Figure 9
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
Scheduling the QoS queue
To specify the schedule to use, perform the following steps from Privileged EXEC mode.
1. Enter global configuration mode.
2. Specify the schedule to use and the traffic class to bandwidth mapping.
3. Enter the copy command to save the running-config file to the startup-config file.
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.
class equivalence mapping applied.
TABLE 21
Multicast traffic class
0
1
2
106
shows that extending the frame scheduler to a hybrid SP+WRR system is fairly
Strict priority and Weighted Round Robin scheduler
switch#configure terminal
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.
switch(config)#qos queue scheduler strict-priority 4 dwrr 10 20 30 40
switch(config)#end
switch#copy running-config startup-config
Multicast traffic class equivalence mapping
Equivalent unicast traffic class
0
1
2
End with CNTL/Z.
Table 21
presents the multicast traffic
Dell Converged Enhanced Ethernet Administrator's Guide
53-1002116-01
Advertisement
Table of Contents
