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Ensure that WMM is enabled for legacy APs for the mapping to take effect. For 802.11n APs, ensure
that either WMM or high throughput is enabled.
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 301 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 301:
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.
NOTE: 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 as well as 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.
When planning your mappings, make sure that any immediate switch or router does not have conflicting 802.1p or
DSCP configurations/mappings. If this occurs, your traffic may not be prioritized correctly.
To view the mapping settings, use the following command:
show wlan ssid-profile <profile>
Using the WebUI to map between WMM AC and DSCP
1. Navigate to the Configuration > Wireless > AP Configuration page.
2. Select either the AP Group or AP Specific tab. Click Edit for the AP group or AP name.
3. In the Profiles list, select Wireless LAN. Select Virtual AP, then select the applicable virtual AP profile. Select
the SSID profile.
4. In the Profile Details, select the Advanced tab.
5. Scroll down to the Wireless Multimedia (WMM) option. Select (check) this option.
6. Modify the DSCP mapping settings, as needed:
DellPowerConnectW-SeriesArubaOS6.2 | User Guide Voiceand Video | 698