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

4-99
Wireless Local Area Networks (WLANs)
Traffic Management (QoS)
Figure 4-57. Editing Station EDCA (WMM) Parameters
3. Select the prioritization protocol used by your wireless stations:
• 802.1p is a Layer 2 protocol that marks traffic in the VLAN tag for one
of eight priorities.
• DSCP is a Layer 3 protocol that marks traffic in the IP header for one
of 64 priorities.
Wireless devices queue frames according to the priority marked by the
selected protocol. For example, if you select 802.1p, a wireless devices
transmits a frame with priority value of 5 in its VLAN tag, using the
parameters for the Video AC. A frame with a DSCP value in the IP header,
but no 802.1p value, is transmitted according to the Best Effort AC.
Refer to Table 4-8 on page 4-94 to review to which ACs various priority
values map. See “Customizing How QoS Marks Map to ACs” on page 4-106
to change which values map to which ACs.
Note If you change the protocol for one queue, the setting automatically changes
in the other three queues for the WLAN; in other words, the setting applies to
the WLAN as a whole. (It does not make sense to use 802.1p to queue some
traffic, but queue other traffic according to DSCP.)