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Catalyst 2950 and Catalyst 2955 Switch Command Reference

OL-10102-02

Chapter 2 Catalyst 2950 and 2955 Cisco IOS Commands

auto qos voip

Command Modes Interface configuration

Command History

Usage Guidelines Use this command to configure the QoS that is appropriate for VoIP traffic within the QoS domain. The

QoS domain includes the switch, the interior of the network, and the edge devices that can classify

incoming traffic for QoS.

In releases earlier than Cisco IOS Release 12.2(20)EA2, auto-QoS configures the switch only for VoIP

with Cisco IP Phones on switch ports.

In Cisco IOS Release 12.2(20)EA2 or later, auto-QoS configures the switch for VoIP with Cisco IP

Phones and for VoIP with devices running the Cisco SoftPhone application. These releases support only

Cisco IP SoftPhone Version 1.3(3) or later. Connected devices must use Cisco Call Manager Version 4

or later.

To take advantage of the auto-QoS defaults, you should enable auto-QoS before you configure other QoS

commands. You can fine-tune the auto-QoS configuration after you enable auto-QoS.

Note The switch applies the auto-QoS-generated commands as if the commands were entered from the

command-line interface (CLI). An existing user configuration can cause the application of the generated

commands to fail or to be overridden by the generated commands. These actions occur without warning.

If all the generated commands are successfully applied, any user-entered configuration that was not

overridden remains in the running configuration. Any user-entered configuration that was overridden can

be retrieved by reloading the switch without saving the current configuration to memory. If the generated

commands fail to be applied, the previous running configuration is restored.

If this is the first port on which you have enabled auto-QoS, the auto-QoS-generated global configuration

commands are executed followed by the interface configuration commands. If you enable auto-QoS on

another port, only the auto-QoS-generated interface configuration commands for that port are executed.

When you enable the auto-QoS feature on the first interface, these automatic actions occur:

• When you enter the auto qos voip cisco-phone interface configuration command on a port at the

edge of the network that is connected to a Cisco IP Phone, the switch enables the trusted boundary

feature. The switch uses the Cisco Discovery Protocol (CDP) to detect the presence or absence of a

Ta bl e 2-2 Auto-QoS Configuration for the Egress Queues

Egress Queue Queue Number CoS-to-Queue Map Queue Weight

1% WRR 4 5 1 percent

70% WRR 3 3, 6, 7 70 percent

20% WRR 2 2, 4 20 percent

10% WRR 1 0, 1 10 percent

Release Modification

12.1(12c)EA1 This command was introduced.

12.1(20)EA2 The cisco-softphone keyword was added, and the generated auto-QoS

configuration changed.

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