Cisco 4500M Command Reference Manual page 43

Chapter2 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. Use the debug auto qos privileged EXEC command to enable
auto-QoS debugging.
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 received in incoming
packets when the switch or router 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 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:
Switch# debug auto qos
AutoQoS debugging is on
Switch# config terminal
Enter configuration commands, one per line. End with CNTL/Z.
Switch(config)# interface gigabitethernet1/1
Switch(config-if)# auto qos voip trust
Switch(config-if)#
00:00:56:qos
00:00:57:qos map cos 3 to dscp 26
00:00:57:qos map cos 5 to dscp 46
00:00:58:qos map dscp 32 to tx-queue 1
00:00:58:qos dbl
00:01:00:policy-map autoqos-voip-policy
00:01:00:
00:01:00:
00:01:00:interface GigabitEthernet1/1
00:01:00: qos trust cos
00:01:00: tx-queue 3
00:01:00:
00:01:00:
00:01:00:
Switchconfig-if)# interface gigabitethernet1/1
Switch(config-if)# auto qos voip cisco-phone
Switch(config-if)#
00:00:55:qos
00:00:56:qos map cos 3 to dscp 26
00:00:57:qos map cos 5 to dscp 46
00:00:58:qos map dscp 32 to tx-queue 1
00:00:58:qos dbl
00:00:59:policy-map autoqos-voip-policy
00:00:59:
78-16201-01
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 received in the packet if the specified interface
is configured as Layer 2 (and is set to trust DSCP if the interface is configured as Layer 3).
class class-default
dbl
priority high
shape percent 33
service-policy output autoqos-voip-policy
class class-default
Catalyst4500 Series SwitchCiscoIOS Command Reference—Release 12.2(18)EW
auto qos voip
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