Cisco Systems 3750E Enabling Auto-QoS for VoIP, Auto qos voip cisco-phone, Cisco-softphone trust

Chapter 36 Configuring QoS

Configuring Auto-QoS

•To take advantage of the auto-QoS defaults, you should enable auto-QoS before you configure other QoS commands. If necessary, you can fine-tune the QoS configuration, but we recommend that you do so only after the auto-QoS configuration is completed. For more information, see the “Effects of Auto-QoS on the Configuration” section on page 36-27.

•After auto-QoS is enabled, do not modify a policy map or aggregate policer that includes AutoQoS in its name. If you need to modify the policy map or aggregate policer, make a copy of it, and change the copied policy map or policer. To use this new policy map instead of the generated one, remove the generated policy map from the interface, and apply the new policy map to the interface.

•You can enable auto-QoS on static, dynamic-access, voice VLAN access, and trunk ports.

•By default, the CDP is enabled on all ports. For auto-QoS to function properly, do not disable the CDP.

•When enabling auto-QoS with a Cisco IP Phone on a routed port, you must assign a static IP address to the IP phone.

•This release supports only Cisco IP SoftPhone Version 1.3(3) or later.

•Connected devices must use Cisco Call Manager Version 4 or later.

Enabling Auto-QoS for VoIP

Beginning in privileged EXEC mode, follow these steps to enable auto-QoS for VoIP within a QoS domain:

	Command	Purpose
Step 1
	configure terminal	Enter global configuration mode.
Step 2
	interface interface-id	Specify the port that is connected to a Cisco IP Phone, the port that is
		connected to a device running the Cisco SoftPhone feature, or the
		uplink port that is connected to another trusted switch or router in the
		interior of the network, and enter interface configuration mode.
Step 3
	auto qos voip {cisco-phone	Enable auto-QoS.
	cisco-softphone trust}	The keywords have these meanings:
		• cisco-phone—If the port is connected to a Cisco IP Phone, the
		QoS labels of incoming packets are trusted only when the
		telephone is detected.
		• cisco-softphone—The port is connected to device running the
		Cisco SoftPhone feature.
		• trust—The uplink port is connected to a trusted switch or router,
		and the VoIP traffic classification in the ingress packet is trusted.
Step 4
	end	Return to privileged EXEC mode.
Step 5
	show auto qos interface interface-id	Verify your entries.
		This command displays the auto-QoS command on the interface on
		which auto-QoS was enabled. You can use the show running-config
		privileged EXEC command to display the auto-QoS configuration
		and the user modifications.

	Catalyst 3750-E and 3560-E Switch Software Configuration Guide
36-28	OL-9775-02