Consolidated Platform Configuration Guide, Cisco Ios Release 15.2(4)E (Catalyst 2960-X Switches - Cisco Catalyst 2960 series Configuration Manual

How to Configure QoS
Command or Action
Step 2
mls qos
Example:
Switch(config)# mls qos
Step 3 interface interface-id
Example:
Switch(config)# interface
gigabitethernet1/0/1
Step 4 priority-queue out
Example:
Switch(config-if)# priority-queue out
Step 5 end
Example:
Switch(config-if)# end
Step 6
show running-config
Example:
Switch# show running-config
Step 7 copy running-config startup-config
Example:
Switch# copy running-config
startup-config
Related Topics
Queueing and Scheduling on Egress Queues
Examples: Configuring Egress Queue Characteristics, on page 640

Consolidated Platform Configuration Guide, Cisco IOS Release 15.2(4)E (Catalyst 2960-X Switches)

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Purpose
Enables QoS on a switch.
Specifies the egress port, and enters interface configuration mode.
Enables the egress expedite queue, which is disabled by default.
When you configure this command, the SRR weight and queue size
ratios are affected because there is one fewer queue participating in
SRR. This means that weight1 in the srr-queue bandwidth shape
or the srr-queue bandwidth share command is ignored (not used
in the ratio calculation).
To disable the egress expedite queue, use the no
Note
priority-queue out interface configuration command.
Returns to privileged EXEC mode.
Verifies your entries.
(Optional) Saves your entries in the configuration file.
To disable the egress expedite queue, use the no priority-queue
out interface configuration command.