QoS Configuration

Traffic that comes to the access point over an Ethernet trunk is already classified by its Class of Service (CoS) settings. This page allows you to classify the traffic by mapping the differentiated services code point (DSCP) values to COs in the IP packets.

Use the drop-down menus to choose the traffic category. The category choices are no change, background, spare, best effort, excellent effort, controlled load, or interactive video.

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© 2003, Cisco Systems, Inc. All rights re

Qualities of Service (QoS) settings are accomplished on this page. You can also fine tune traffic category contention window settings.

■ Generate QBSS Element: Use this setting to determine whether a QoS basic service set (QBSS) element is generated. The QBSS element determines the best access point with which to associate.

■ Use Symbol Extensions: This setting configures the access point to use Symbol Voice over IP (VoIP) phones. When this setting is enabled, the access point uses the Symbol Phone Support protocol. This protocol identifies Symbol handsets and classifies traffic for them as interactive voice.

■ Send IGMP General Query: This setting configures the access point to perform IP multicast filtering. Automatic IP multicast filtering is not directly supported on the access point. This setting is the mechanism that injects IP multicast filtering onto Ethernet switches.

© 2003, Cisco Systems, Inc. All rights re

© 2003, Cisco Systems, Inc. All rights re

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

— Background Spare

— Best effort (default setting)

— Excellent effort

— Controlled load

— Interactive video

— Interactive voice

— Network control

■ CWmin and CWmax: Each traffic 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.

© 2003, Cisco Systems, Inc. All rights re

QoS (Quality of Service) Policies may be created from the Services> QoS menu. QoS policies permit the prioritization of packets based on the device type, IP tags, VLAN, or predefined filter (ACL).

The Policy Name is used as an descriptor to uniquely identify each QoS policy defined in the AP. After the association of parameters to a QoS Policy, these associated parameters will appear in the "Classifications" selection box.

Under the Match Classifications menu, the specific mechanism used to prioritize packets (either IP Precedence, IP DSCP, IP Protocol 119, Filter, Default Classification for Packets on the VLAN) and the Apply Class of Service menu pulldown menu is used to apply CoS for each defined Classification.

After configuration of QoS policies, the configured policies may be applied to the desired interface, either for inbound (Incoming) or outbound (Outgoing) traffic. Additionally, policies may be uniquely defined for each configured VLAN on the AP in order to permit unique packet prioritization for different VLAN and user classes.

Under the "Traffic Classes" menu, the Traffic Class Definitions (as relate to 802.11 contention window) for each Class of Service defined in the AP may be reviewed and edited.

The screen indicated on this slide shows the default contention window settings defined for each Class of Service which is assigned via the QoS policy menu.

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© 2003, Cisco Systems, Inc. All rights re

The Advanced menu permits the configuration of specific Quality of Service parameters for unique applications:

■ IP Phone permits the QoS Element for Wireless Phones to be Enabled or Disabled. This parameter configures the AP to broadcast "quality beacon" information in the beacons for association by 802.11 telephony devices.

■ IGMP Snooping permits the AP to "proxy" an IGMP query to the (IGMP snooping enabled) network on behalf of an IGMP client in order to preserve the integrity of the multicast stream to IGMP members. Note the "Snooping Helper" is enabled by default.

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