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AT-TQ2403 Management Software User's Guide 125
802.1q and DSCP tags
IEEE 802.1q is an extension of the IEEE 802 standard and is responsible for QoS provision. One purpose
of 802.1q is to prioritize network traffic at the data link/ MAC layer.
The 802.1q tag includes a three-bit field for prioritization, which allows packets to be grouped into
various traffic classes. Eight priority levels are defined. The highest priority is seven, which might go to
network- critical traffic (voice). The lowest priority level is zero, this is used as a best-effort default, it is
invoked automatically when no other value has been set.
Note: It is important to note that 802.1q prioritization will not work unless QoS and
WMM are en
abled. WMM must be enabled on both the AP and on the client connecting to
the AP.
The flow diagram below outlines the way in which tags are retrieved and traffic prioritized on a network.
Figure 48: 802.1q Tag Retrieving Flow Diagram