Cisco Catalyst 4500 Series Command Reference Manual page 123

Chapter 2 Cisco IOS Commands for the Catalyst 4500 Series Switches
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You can enable auto-QoS on static, dynamic-access, voice VLAN access, and trunk ports.
To display the QoS configuration that is automatically generated when auto-QoS is enabled, enable
debugging (before you enable auto-QoS) with the debug auto qos privileged EXEC command.
To disable auto-QoS on an interface, use the no auto qos voip interface configuration command. When
you enter this command, the switch enables standard QoS and changes the auto-QoS settings to the
standard QoS default settings for that interface. This action will not change any global configuration
performed by auto-QoS; the global configuration remains the same.
Examples This example shows how to enable auto-QoS and to trust the CoS and DSCP labels that are received in
the incoming packets when the switch or router that is connected to Gigabit Ethernet interface 1/1 is a
trusted device:
Switch(config)# interface gigabitethernet1/1
Switch(config-if)# auto qos voip trust
This example shows how to enable auto-QoS and to trust the CoS labels that are received in incoming
packets when the device connected to Fast Ethernet interface 2/1 is detected as a Cisco IP phone:
Switch(config)# interface fastethernet2/1
Switch(config-if)# auto qos voip cisco-phone
This example shows how to display the QoS configuration that is automatically generated when
auto-QoS is enabled on an interface on a Supervisor Engine 6-E:
Switch#configure terminal
Enter configuration commands, one per line.
Switch(config)#interface gigabitethernet3/10
Switch(config-if)#auto qos voip trust
Switch(config-if)#
1d03h:
1d03h:
Switch(config-if)#intface gigabitethernet3/11
Switch(config-if)#auto qos voip
cisco-phone
Switch(config-if)#
1d03h:
1d03h:
1d03h:
Switch(config-if)#end
Switch#
You can verify your settings by entering the show auto qos interface command.
Related Commands Command
debug auto qos (refer to Cisco
IOS documentation)
qos trust
show auto qos
OL-25342 -01
When you enter the auto qos voip trust interface configuration command, the ingress classification
on the specified interface is set to trust the CoS label that is received in the packet provided the
specified interface is configured as Layer 2 (and is set to trust DSCP if the interface is configured
as Layer 3).
service-policy input AutoQos-VoIP-Input-Cos-Policy
service-policy output AutoQos-VoIP-Output-Policy
qos trust device cisco-phone
service-policy input AutoQos-VoIP-Input-Cos-Policy
service-policy output AutoQos-VoIP-Output-Policy
Catalyst 4500 Series Switch Cisco IOS Command Reference—Release IOS XE 3.3.0SG and IOS 15.1(1)SG)
End with CNTL/Z.
Description
Debugs Auto QoS.
Sets the trusted state of an interface.
Displays the automatic quality of service (auto-QoS)
configuration that is applied.
auto qos voip
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