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Chapter30 Configuring QoS Auto-QoS Configuration Example
Note You should not configure any standard-QoS commands before entering the auto-QoS commands. You
can fine-tune the QoS configuration, but we recommend that you do s o o nly af ter the a uto- QoS
configuration is completed.
Beginning in privileged EXEC mode, follow these steps to configure the switch at the edge of the QoS
domain to prioritize the VoIP traffic over all other traffic:
Command Purpose
Step1 debug auto qos Enable debugging for auto-QoS. When debugging is enabled, the switch
displays the QoS configuration that is automatically generated when auto-QoS
is enabled.
Step2 configure terminal Enter global configuration mode.
Step3 cdp enable Enable CDP globally. By default, it is enabled.
Step4 interface interface-id Specify the switch port connected to the Cisco IP Phone, and enter interface
configuration mode.
Step5 auto qos voip cisco-phone Enable auto-QoS on the interface, and specify that the interface is connected to
a Cisco IP Phone.
The QoS labels of incoming packets are trusted only when the IP phone is
detected.
Step6 exit Return to global configuration mode.
Step7 Repeat Steps 4 to 6 for as many ports as are connected to the Cisco IP Phone.
Step8 interface interface-id Specify the switch port identified as connected to a trusted switch or r outer , and
enter interface configuration mode. See Figure30-3.
Step9 auto qos voip trust Enable auto-QoS on the interface, and specify that the interface is connected to
a trusted router or switch.
Step10 end Return to privileged EXEC mode.
Step11 show auto qos Verify your entries.
This command displays the auto-QoS command on the interface on w hich
auto-QoS was enabled. You can use the show running-config pri vileged EXEC
command to display the auto-QoS configuration and the user modifications.
For information about the QoS configuration that might be affected by
auto-QoS, see the Displaying Auto-QoS Information section on page 26-12.
Step12 copy running-config
startup-config Save the auto qos voip interface configuration commands and the generated
auto-QoS configuration in the configuration file.