Cisco Systems DL-2159-05 Applying QoS, By Station, Send Igmp General Query, Traffic Category

Chapter 5 Configuring Filters and QoS

Applying QoS

Send IGMP General Query

Configures the access point to perform IP multicast filtering on behalf of its clients. When Internet Group Membership Protocol (IGMP) snooping is enabled on a switch, and a client roams from one access point to another, the multicast session is dropped. Enabling this feature causes the access point to send a general IGMP query to the network infrastructure on behalf of the client every time it associates or reassociates to the access point. By doing so, the multicast stream is maintained for the client as it roams.

Traffic Category

Traffic category identifies a type of traffic in which data processed by the access point is categorized. There are seven categories:

•Background

•Spare

•Best effort

•Excellent effort

•Controlled load

•Interactive video

•Interactive voice

•Network control

Each category is assigned a minimum contention window (CWmin) value and a maximum contention window (CWmax) value. Allowed values for CWmin and CWmax are 1, 3, 7, 15, 31, 63, 127, 255, 511, and 1023.

Note Cisco recommends that you do not alter these settings without significant testing. If you do alter the values, CWmin must be less than or equal to CWmax.

Applying QoS

You can apply QoS to specific traffic handled by the access point in a number of ways:

•By station

•By VLAN

•By filter

•By Class of Service (CoS) value

•By differentiated services code point (DSCP) value

By Station

The access point can prioritize traffic based upon a WLAN client identifying itself as a particular client type that requires a particular traffic classification.

Cisco Aironet 1200 Series Access Point Software Configuration Guide

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