Users Guide

Table Of Contents
931| Voice and Video Dell Networking W-Series ArubaOS 6.5.x| User Guide
In the CLI
To enable WMM for wireless clients:
(host)(config)#wlan ssid-profile <profile>
wmm
wmm-uapsd
Configuring WMM AC Mapping
The IEEE 802.11e standard defines the mapping between WMM ACs and Differentiated Services Code Point
(DSCP) tags. The WMM AC mapping commands allow you to customize the mapping between WMM ACs and
DSCP tags to prioritize various traffic types. You apply and configure WMM AC mappings to a WMM-enabled
SSID profile.
Ensure that you enable WMM for legacy APs for the mapping to take effect. For 802.11n APs, ensure that you enable
either WMM or high throughput.
DSCP classifies packets based on network policies and rules, not priority. The configured DSCP value defines
per hop behaviors (PHBs). The PHB is a 6-bit value added to the 8-bit Differentiated Services (DS) field of the IP
packet header. The PHB defines the policy and service applied to a packet when traversing the network. You
configure these services in accordance with your network policies. Table 215 shows the default WMM AC to
DSCP decimal mappings and the recommended WMM AC to DSCP mappings.
DSCP Decimal Value WMM Access Category
8 Background
16
0 Best effort
24
32 Video
40
48 Voice
56
Table 215: WMM Access Category to DSCP Mappings
By customizing WMM AC mappings, both the controller and AP maintain a customized WMM AC mapping table
for each configured SSID profile. All packets received are matched against the entries in the mapping table and
prioritized accordingly. The mapping table contains information for upstream (client to AP) and downstream
(AP to client) traffic.
In earlier releases, the default mappings exist for all SSIDs. After you customize a WMM AC mapping and apply it to
the SSID, the controller overwrites the default mapping values and uses the configured values . If a controller is
upgraded to 6.2 from an older version, the default and the user configured WMM-DSCP mappings in the existing SSID
profiles are retained. There are no default mappings for a newly created SSID profile and for a factory default
controller running 6.2 image.