Brocade Communications Systems 53-1001761-01 Multicast queue scheduling

Converged Enhanced Ethernet Administrator’s Guide 105
53-1001761-01
Scheduling 9
DRAFT: BROCADE CONFIDENTIAL
Multicast queue scheduling
The multicast traffic classes are numbered from 0 to 3; 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 20 presents the multicast traffic
class equivalence mapping applied.
Once the multicast traffic class equivalence mapping has been applied, then scheduling and any
scheduler configuration are inherited from the equivalent unicast traffic class. See Table 19 on
page104 for details on exact mapping equivalencies.
Unicast ingress and egress queueing utilizes a hybrid scheduler that simultaneously supports
SP+WRR service and multiple physical queues with the same service level. Multicast adds
additional multicast expansion queues. Since multicast traffic classes are equivalent to unicast
service levels, they're treated exactly as their equivalent unicast service policies.
Scheduling the QoS multicast queue
Perform the following steps from Privileged EXEC mode to schedule the QoS multicast queue.
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 multicast scheduler dwrr 10 20 30 40
Example of setting the multicast Traffic Class frame expansion scheduler for 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 multicast scheduler 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 20 Multicast traffic class equivalence mapping
Multicast traffic class Equivalent unicast traffic class
36
24
12
00