Users Guide

Table Of Contents
562 | Voice and Video Dell PowerConnect ArubaOS 5.0 | User Guide
In non-WMM, or hybrid environments where some clients are not WMM-capable, Dell uses voice and best effort
to prioritize traffic from these clients.
Unscheduled Automatic Power Save Delivery (U-APSD) is a component of the IEEE 802.11e standard that
extends the battery life on voice over WLAN devices. When enabled, clients trigger the delivery of buffered data
from the AP by sending a data frame.
For those environments in which the wireless clients support WMM, you can enable both WMM and U-APSD in
the SSID profile.
Using the WebUI to enable WMM
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. Click Apply.
Using the CLI to enable WMM
wlan ssid-profile <profile> wmm
wlan ssid-profile <profile> wmm-uapsd
Configurable WMM AC Mapping
The IEEE 802.11e standard defines the mapping between WMM ACs and Differentiated Services Codepoint
(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.
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
Table 122 WMM Access Category to 802.1D Priority Mapping
Priority 802.1D Priority WMM Access Category
Lowest 1 Background
2
0 Best effort
3
4Video
5
6Voice
Highest 7
Note: The user-configured mapping only takes effect when WMM is enabled for the SSID profile.