Converged Enhanced Ethernet Administrator's Guide v6.4.0 (53-1001761-01, June 2010)

Converged Enhanced Ethernet Administrator’s Guide 105

53-1001761-01

Scheduling

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

page 104 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 command to save the running-config file to the startup-config file.

switch#copy running-config startup-config

TABLE 20 Multicast traffic class equivalence mapping

Multicast traffic class Equivalent unicast traffic class