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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

Cisco IP Phone. When a Cisco IP Phone is detected, the ingress classification on the interface is set

to trust the QoS label received in the packet. When a Cisco IP Phone is absent, the ingress

classification is set to not trust the QoS label in the packet. The egress queues on the interface are

also reconfigured (see

Table 2-2).

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

the edge of the network that is connected to a device running the Cisco SoftPhone, the switch uses

policing to decide whether a packet is in or out of profile and to specify the action on the packet. If

the packet does not have a DSCP value of 24, 26, or 46 or is out of profile, the switch changes the

DSCP value to 0. The egress queues on the interface are also reconfigured (see

Table 2-2).

• When you enter the auto qos voip trust interface configuration command on a port connected to the

interior of the network, the ingress classification on the interface is set to trust the QoS label received

in the packet, and the egress queues on the interface are reconfigured (see

Table 2-2).

You can enable auto-QoS on static, dynamic-access, voice VLAN access, and trunk ports.

Note When a device running Cisco SoftPhone is connected to a switch or routed port, the switch supports only

one Cisco SoftPhone application per port.

After auto-QoS is enabled, do not modify a policy map or aggregate policer that includes AutoQoS in its

name. If you need to modify the policy map or aggregate policer, make a copy of it, and change the

copied policy map or policer. To use the new policy map instead of the generated one, remove the

generated policy, and apply the new policy map.

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 changes the auto-QoS settings to the standard-QoS default settings

for that interface.

To disable auto-QoS on the switch and return to the default port trust state (untrusted), follow these steps:

1. Use the no auto qos voip interface configuration command on all interfaces on which auto-QoS is

enabled. To disable auto-QoS on multiple interfaces at the same time, you can use the

interface

range global configuration command.

2. After disabling auto-QoS on all interfaces on which auto-QoS was enabled, return the egress queues

and CoS-to-DSCP map to the default settings by using these global configuration commands:

• no wrr-queue bandwidth

• no wrr-queue cos-map

• no mls qos map cos-dscp

Examples This example shows how to enable auto-QoS and to trust the QoS labels received in incoming packets

when the switch or router connected to a port is a trusted device:

Switch(config)# interface gigabitethernet0/1

Switch(config-if)# auto qos voip trust

This example shows how to enable auto-QoS and to trust the QoS labels received in incoming packets

when the device connected to a port is detected as a Cisco IP phone:

Switch(config)# interface fastethernet0/1

Switch(config-if)# auto qos voip cisco-phone

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Cisco 2950 - Catalyst Switch Especificaciones Pagina 45

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Cisco 2950 - Catalyst Switch Especificaciones Pagina 45

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