Cisco Systems 3750E manual Enabling QoS Globally, Enabling VLAN-Based QoS on Physical Ports, 36-37

Chapter 36 Configuring QoS

Configuring Standard QoS

•A switch that is running the IP services feature set supports QoS DSCP and IP precedence matching in policy-based routing (PBR) route maps with these limitations:

–You cannot apply QoS DSCP mutation maps and PBR route maps to the same interface.

–You cannot configure DSCP transparency and PBR DSCP route maps on the same switch.

Enabling QoS Globally

By default, QoS is disabled on the switch.

Beginning in privileged EXEC mode, follow these steps to enable QoS. This procedure is required.

	Command	Purpose
Step 1
	configure terminal	Enter global configuration mode.
Step 2
	mls qos	Enable QoS globally.
		QoS runs with the default settings described in the “Default
		Standard QoS Configuration” section on page 36-33, the
		“Queueing and Scheduling on Ingress Queues” section on
		page 36-15, and the “Queueing and Scheduling on Egress
		Queues” section on page 36-18.
Step 3
	end	Return to privileged EXEC mode.
Step 4
	show mls qos	Verify your entries.
Step 5
	copy running-config startup-config	(Optional) Save your entries in the configuration file.

To disable QoS, use the no mls qos global configuration command.

Enabling VLAN-Based QoS on Physical Ports

By default, VLAN-based QoS is disabled on all physical switch ports. The switch applies QoS, including class maps and policy maps, only on a physical-port basis. In Cisco IOS Release 12.2(25)SE or later, yYou can enable VLAN-based QoS on a switch port.

Beginning in privileged EXEC mode, follow these steps to enable VLAN-based QoS. This procedure is required on physical ports that are specified in the interface level of a hierarchical policy map on an SVI.

	Command	Purpose
Step 1
	configure terminal	Enter global configuration mode.
Step 2
	interface interface-id	Specify the physical port, and enter interface configuration
		mode.
Step 3
	mls qos vlan-based	Enable VLAN-based QoS on the port.
Step 4
	end	Return to privileged EXEC mode.
Step 5
	show mls qos interface interface-id	Verify if VLAN-based QoS is enabled on the physical port.
Step 6
	copy running-config startup-config	(Optional) Save your entries in the configuration file.

	Catalyst 3750-E and 3560-E Switch Software Configuration Guide
OL-9775-02		36-37