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Cisco IE 2000 Switch Software Configuration Guide
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Chapter 39 Configuring Auto-QoS
Information About Auto-QoS
• Auto-QoS configures the switch for VoIP with Cisco IP phones on nonrouted and routed ports.
Auto-QoS also configures the switch for VoIP with devices running the Cisco SoftPhone
application.
• When a device running Cisco SoftPhone is connected to a nonrouted or routed port, the switch
supports only one Cisco SoftPhone application per port.
• Auto-Qos VoIP uses the priority-queue interface configuration command for an egress interface.
You can also configure a policy-map and trust device on the same interface for Cisco IP phones.
• After auto-QoS is enabled, do not modify a policy map o r aggregate policer that includes AutoQoS
in its name. If you need to modify the policy map or aggr egate policer, make a copy of it, and change
the copied policy map or policer. To use this new policy map instead of the generated one, remove
the generated policy map from the interface, and apply the new policy map to the interface.
• You can enable auto-QoS on static, dynamic-access, voice VLAN access, and trunk ports.
Information About Auto-QoS
This chapter describes how to configure quality of service (QoS) by using automatic QoS (auto-QoS)
command on the switch. With QoS, you can provide preferential treatment to certain types of traffic at
the expense of others. Without QoS, the switch offers best-effort service to each packet, regardless of
the packet contents or size. It sends the packets without any assurance of reliability, delay bounds, or
throughput.
You can configure QoS on physical ports and on switch virtual interfaces (SVIs). Other tha n to apply
policy maps, you configure the QoS settings, such as classification, queueing, and scheduling, the same
way on physical ports and SVIs. When configuring QoS on a physical port, you apply a nonhierarchical
policy map to a port. When configuring QoS on an SVI, you apply a n onhierarchical or a hierarchical
policy map.
The switch supports some of the modular QoS CLI (MQC) commands. For m ore information about the
MQC commands, see the “Modular Quality of Service Command-Line Interface Overview” chapter of
the Cisco IOS Quality of Service Solutions Guide.

Auto-QoS

You can use the auto-QoS feature to simplify the deployment of QoS features. Auto-QoS determines the
network design and enables QoS configurations so that the switch can prioritize different traffic flows.
It uses the ingress and egress queues instead of using the default (disabled) QoS behavior. The switch
offers best-effort service to each packet, regardless of the packet conten ts or size, and sends it from a
single queue.
When you enable auto-QoS, it automatically classifies traffic based on the traffic type and ingress packet
label. The switch uses the classification results to choose the appropriate egress queue.
Auto-QoS supports IPv4 and IPv6 traffic when you configure the dual IPv4 and IPv6 SDM template with
the sdm prefer dual ipv4-and-ipv6 global configuration command.
You use auto-QoS commands to identify ports connected to Cisco IP phones and to devices runn ing the
Cisco SoftPhone application. You also use the commands to identify ports that receive trusted traffic
through an uplink. Auto-QoS then performs these functions:
• Detects the presence or absence of Cisco IP phones
• Configures QoS classification