C H A P T E R 7

Configuring QoS on an Access Point

This chapter describes how to configure quality of service (QoS) on an access point. QoS provides preferential treatment to certain traffic at the expense of other traffic. Without QoS, the access point 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.

Recommended Reading

The following information is recommended for gaining a better understanding of QoS as it applies to voice deployments in a wireless environment:

Wireless Quality-of-Service Deployment Guide

http://www.cisco.com/en/US/products/hw/wireless/ps430/prod_technical_reference09186a008014449 8.html

Cisco Wireless IP Phone 7920 Design and Deployment Guide

http://www.cisco.com/en/US/products/hw/phones/ps379/products_implementation_design_guide_boo k09186a00802a029a.html

Understanding QoS for Wireless LANs

Typically, networks operate on a best-effort delivery basis that means that all traffic has equal priority and an equal chance of being delivered in a timely manner. When congestion occurs, all traffic has an equal chance of being dropped.

When QoS is configured on an access point, you can select specific network traffic, prioritize it, and use congestion-management and congestion-avoidance techniques to provide preferential treatment. Implementing QoS in a wireless LAN makes network performance more predictable and bandwidth utilization more effective.

Configuring QoS creates and applies policies to the VLANs configured on the access point. If VLANs are not used on the network, QoS policies can be applied to the Ethernet and radio ports.

QoS for Wireless LANs Versus QoS on Wired LANs

The QoS implementation for wireless LANs differs from QoS implementations on other Cisco devices. With QoS enabled, access points perform the following:

•Does not classify packets; it prioritizes packets based on Differentiated Services Code Point (DSCP) value, client type (such as a wireless phone), or the priority value in the 802.1q or 802.1p tag.

Cisco Wireless Router and HWIC Configuration Guide

 

OL-6415-03

7-1

 

 

 

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3D Connexion OL-6415-03 manual Understanding QoS for Wireless LANs, QoS for Wireless LANs Versus QoS on Wired LANs
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OL-6415-03 specifications

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