IP Phone

QoS Element for Wireless Phones

If you enable this feature, dynamic voice classifiers are created for some of the wireless phone vendor clients, which allows the wireless phone clients' traffic to be a higher priority than other clients' traffic. Additionally, the QoS Basic Service Set (QBSS) information element is enabled to advertise channel load information in the beacon and probe response frames. Some IP phones use the QBSS element to determine which access point to associate to.

IGMP Snooping

Snooping Helper

When Internet Group Membership Protocol (IGMP) snooping is enabled on a switch and a client roams from one access point to another, the client's multicast session is dropped. When the access point's IGMP snooping helper is enabled, the access point sends a general IGMP query to the network infrastructure on behalf of the client every time the client associates or reassociates to the access point. By doing so, the multicast stream is maintained for the client as it roams.

The Snooping Helper is enabled by default. To disable, click the Disable selection and click Apply.

AVVID Priority Mapping

Map Ethernet Packets with CoS 5 to COs 6

If your network is based upon Cisco AVVID specification, click Yes. This mapping prioritizes voice packets that include priority 5 (video).

WiFi MultiMedia (WMM)

Wi-Fi Multimedia (WMM) is a component of the IEEE 802.11e wireless LAN standard for quality of service (QoS). It specifically supports priority tagging and queuing.

When you enable QoS, the access point uses WMM mode by default. Unselect the Enable on Radio Interfaces check box to disable WMM for a particular radio interface.

See Also: Services: QoS Policies, Services: QoS Policies - Access Category Definition