Brocade FastIron Ethernet Switch Traffic Management Guide - Manual (Page 41)

Selecting the QoS queuing method
By default, Brocade devices use the WRR method of packet prioritization. To change the method to SP,
enter the qos mechanism strict command at the global CONFIG level of the CLI.
device(config)#qos mechanism strict
To change the method back to WRR, enter the qos mechanism weighted command.
device(config)#qos mechanism weighted
To change the queuing mechanism to the combined SP and WRR method, enter the qos mechanism
mixed-sp-wrr command at the global CONFIG level of the CLI.
device(config)#qos mechanism mixed-sp-wrr
Syntax: [no] qos mechanism { strict | weighted | mixed-sp-wrr }
Configuring the QoS queues
Each of the queues has the following configurable parameters:
• The queue name
• The minimum percentage of a port outbound bandwidth guaranteed to the queue
Renaming the queues
The default queue names are qosp7, qosp6, qosp5, qosp4, qosp3, qosp2, qosp1, and qosp0. You can
change one or more of the names if desired.
To rename queue " qosp3 " to " 92-octane ", enter the following command.
device(config)#qos name qosp3 92-octane
Syntax: qos name old-name new-name
The old-name variable specifies the name of the queue before the change.
The new-name variable specifies the new name of the queue. You can specify an alphanumeric string
up to 32 characters long.
Changing the minimum bandwidth percentages of the WRR queues
If you are using the weighted round robin mechanism instead of the strict priority mechanism, you can
change the weights for each queue by changing the minimum percentage of bandwidth you want each
queue to guarantee for its traffic.
NOTE
On the SX-FI48GPP interface module, the bandwidth percentages for 8 to 4 queue mapping for WRR
queues are different from other Brocade SX modules. For more information on 8 to 4 queue mapping on
the SX-FI48GPP interface module, refer to
Default scheduling configuration for the SX-FI48GPP
module on page 36.
By default, the eight QoS queues on FastIron devices receive the minimum guaranteed percentages of
a port’s total bandwidth, as shown in the following table. Note that the defaults differ when jumbo frames
are enabled.
Selecting the QoS queuing method
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