WESM zl Management and Configuration Guide WT.01.28 and greater

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Wireless Local Area Networks (WLANs)
Traffic Management (QoS)
Table 4-8. Priority Values for WMM ACs
By default, the module uses 802.1p priority to place traffic in a queue. You can choose
DSCP instead; see “Customizing Station WMM Parameters” on page 4-100.
Priority Queuing on Traffic Transmitted from RPs to Wireless Stations.
Remember that all traffic on a radio shares the same medium. So an RP radio may
queue traffic for multiple WLANs together. By default, RPs queue traffic according
to the classification of the WLAN to which it belongs. Because, by default, this
classification is normal for all WLANs, all traffic receives the same handling.
One way to configure RPs to prioritize the traffic they transmit is to assign different
classifications to traffic in different WLANs. See “Manually Classifying a WLAN’s
Traffic” on page 4-108.
For more precise prioritization, you can enable WMM on a WLAN. WMM allows
RPs to queue traffic destined the WLAN according to each frame’s QoS mark. In
other words, the RP uses an 802.1p or DSCP value to assign traffic to an AC. The
RP creates one queue for each AC on each of its radios. The radio then transmits
traffic in that queue using the RP WMM parameters (such as AIFSN) for that AC.
(For more information about the RP WMM parameters for wired to wireless traffic,
see “Viewing and Customizing RP WMM Parameters” on page 4-103.)
In this way, traffic with a higher priority receives more bandwidth, as shown in
Figure 4-53. The RP radio continues to provide all wired to wireless traffic belonging
to non-WMM WLANs with normal QoS.
Queue Number AC 802.1p Priority DSCP
1 Background 1, 2 8-23
2 Best Effort 0, 3 0-7. 24-31
3 Video 4, 5 32-47
4 Voice 6, 7 48-63