Cisco 2950 Software Configuration Guide - Page 573
Effects of Auto-QoS on the Configuration, Configuration Guidelines
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Chapter 30 Configuring QoS Configuring Auto-QoS Effects of Auto-QoS on the Configuration When auto-QoS is enabled, the auto qos voip interface configuration command and the generated configuration are added to the running configuration. The switch applies the auto-QoS-generated commands as if the commands were entered from the 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. Configuration Guidelines Before configuring auto-QoS, you should be aware of this information: • In releases earlier than Cisco IOS Release 12.1(20)EA2, auto-QoS configures the switch only for VoIP with Cisco IP Phones. • In Cisco IOS Release 12.1(20)EA2 or later, auto-QoS configures the switch for VoIP with Cisco IP Phones and with devices running the Cisco SoftPhone application. Note When a device running Cisco SoftPhone is connected to a port, the switch supports only one Cisco SoftPhone application per port. • To take advantage of the auto-QoS defaults, you should enable auto-QoS before you configure other QoS commands. If necessary, you can fine-tune the QoS configuration, but we recommend that you do so only after the auto-QoS configuration is completed. For more information, see the "Effects of Auto-QoS on the Configuration" section on page 30-13. • 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 map from the interface, and apply the new policy map to it. • You can enable auto-QoS on static, dynamic-access, voice VLAN access, and trunk ports. • By default, the CDP is enabled on all interfaces. For auto-QoS to function properly, do not disable the CDP. • When auto-QoS is enabled for VoIP with the Cisco SoftPhone, the switch uses one mask for the auto-QoS configuration. • This release supports only Cisco IP SoftPhone Version 1.3(3) or later. • Connected devices must use Cisco Call Manager Version 4 or later. 78-11380-10 Catalyst 2950 and Catalyst 2955 Switch Software Configuration Guide 30-13
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