Specifications

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Cisco Aironet Access Point Software Configuration Guide
OL-0657-07
Chapter 5 Configuring Filters and Quality of Service
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 pointor bridge 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 or bridge can prioritize traffic based upon a WLAN client identifying itself as a
particular client type that requires a particular traffic classification.