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Catalyst2950 and Catalyst2955 Switch Software Configuration Guide
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Chapter30 Co nf iguring QoS
Configuring Auto-QoS
Upgrading from a Previous Software Release
In Cisco IOS Release 12.2(20)EA2, the implementation for auto-QoS ch anged from the previous release.
The generated auto-QoS configuration was changed and support for the Cisco SoftPhone feature was
added.
If auto-QoS is configured on the switch, your switch is running a release earlier than Cisco IOS
Release 12.2(20)EA2, and you upgrade to Cisco IOS Release 12.2(20)EA2 or later, the configuration file
will not contain the new configuration, and auto-QoS will not operate. Follow these steps to update the
auto-QoS settings in your configuration file:
1. Upgrade your switch to Cisco IOS Release 12.2(20)EA2 or later.
2. Disable auto-QoS on all ports on which auto-QoS was enabled.
3. Return all the global auto-QoS settings to their default values by using the no commands.
4. Re-enable auto-QoS on the ports on which auto-QoS was disabled in Step 2. Configure the ports
with the same auto-QoS settings as the previous ones.
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
Step1 configure terminal Enter global configuration mode.
Step2 interface interface-id Specify the interface that is conne ct ed to a Ci sco I P Pho n e, an d e nt e r
interface configuration mode. You also can specify the u plink interface
that is connected to another trusted witch or router in the interior of the
network.
Step3 auto qos voip {cisco-phone |
cisco-softphone | trust}Enable auto-QoS.
The keywords have these meanings:
•cisco-phone—If the interface is connected to a Cisco IP Phone,
the QoS labels of incoming packets are trusted only when the IP
phone is detected.
•cisco-softphone—The port is connected to device running the
Cisco SoftPhone feature.
Note The cisco-softphone keyword is supported only in Cisco IOS
Release 12.2(20)EA2 or later.
•trust—The uplink interface is connected to a trusted switch or
router, and the VoIP classification in the ingress packet is trusted.
Step4 end Return to privileged EXEC mode.
Step5 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-Qo S configuration and
the user modifications.