Cisco Systems OL-6415-04 manual Using Wi-Fi Multimedia Mode

Chapter 9 Configuring QoS

Understanding QoS for Wireless LANs

Note This release continues to support existing 7920 wireless phone firmware. Do not attempt to use the new standard (IEEE 802.11e draft 13) QBSS Load IE with the 7920 Wireless Phone until new phone firmware is available for you to upgrade your phones.

This example shows how to enable IEEE 802.11 phone support with the legacy QBSS Load element:

AP(config)# dot11 phone

This example shows how to enable IEEE 802.11 phone support with the standard (IEEE 802.11e draft 13) QBSS Load element:

AP(config)# no dot11 phone dot11e

This example shows how to stop or disable the IEEE 802.11 phone support:

AP(config)# no dot11 phone

3.Policies you create on the access point—QoS Policies that you create and apply to VLANs or to the access point interfaces are third in precedence after previously classified packets and the QoS Element for Wireless Phones setting.

4.Default classification for all packets on VLAN—If you set a default classification for all packets on a VLAN, that policy is fourth in the precedence list.

Using Wi-Fi Multimedia Mode

When you enable QoS, the access point uses Wi-Fi Multimedia (WMM) mode by default. WMM provides these enhancements over basic QoS mode:

•The access point adds each packet’s class of service to the packet’s 802.11 header to be passed to the receiving station.

•Each access class has its own 802.11 sequence number. The sequence number allows a high-priority packet to interrupt the retries of a lower-priority packet without overflowing the duplicate checking buffer on the receiving side.

•For access classes that are configured to allow it, transmitters that are qualified to transmit through the normal backoff procedure are allowed to send a set of pending packets during the configured transmit opportunity (a specific number of microseconds). Sending a set of pending packets improves throughput because each packet does not have to wait for a backoff to gain access; instead, the packets can be transmitted immediately one after the other.

The access point uses WMM enhancements in packets sent to client devices that support WMM. The access point applies basic QoS policies to packets sent to clients that do not support WMM.

Use the no dot11 qos mode wmm configuration interface command to disable WMM using the CLI. To disable WMM using the web-browser interface, unselect the check boxes for the radio interfaces on the QoS Advanced page.

Cisco Wireless ISR and HWIC Access Point Configuration Guide

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