Wireless/Redundant Edge Services xl Module Management and Configuration Guide WS.02.xx and greater

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Wireless Local Area Networks (WLANs)
Traffic Management (QoS)
Enabling Prioritization of Voice Traffic
Voice prioritization improves the QoS for traffic destined to VoWLAN devices.
The Wireless Edge Services xl Module configures RPs to monitor all packets
from stations in a WLAN; if the IP type in a packet’s header indicates that it is
a voice packet, the module marks all traffic destined to the packet’s source as
high-priority voice packets.
Traffic destined to the VoWLAN device thus receives priority handling both in
the Ethernet network (from the wireless services-enabled switch to the RP)
and in the wireless network (from the RP to the VoWLAN device). The wireless
services-enabled switch forwards the traffic in its high-priority queue, and the
RP uses its Voice queue settings.
Voice prioritization thus helps to maintain QoS for VoWLAN devices that do
not support WMM on their own.
To enable the Wireless Edge Services xl Module to prioritize traffic to voice
stations in a particular WLAN, complete these steps:
1. Access the Edit screen for the WLAN that includes voice devices:
a. Select Network Setup > WLAN Setup and click the Configuration tab.
b. Select the WLAN and click the Edit button. The Edit screen is displayed.
2. Under Advanced, check the Use Voice Prioritization box.
3. Click the OK button.
Specifying Multicast Addresses for Voice Traffic
VoWLAN devices often send and listen for traffic on a specific multicast
address. When you specify this address in a WLAN’s settings, the Wireless
Edge Services xl Module prioritizes this traffic.
To specify multicast addresses for voice traffic, complete these steps:
1. Select Network Setup > WLAN Setup and click the Configuration tab.
2. Select the WLAN that includes voice devices, and then click the Edit
button. The Edit screen is displayed.