QoS is enabled automatically with airMAX devices and there is no configuration necessary to enable QoS. In order for the devices to prioritize traffic properly, the traffic will need to have the DSCP/ToS values correctly configured prior to the traffic entering the airMAX equipment.
In order for airMAX to classify and differentiate types of traffic when applying QoS rules, the traffic must have a special value set in the IP Header DSCP field. The originating software or hardware device is responsible for applying this value, and only if this field is set will traffic be prioritized.
There are four traffic categories: Best Effort, Background, Video, and Voice, which range from priorities lowest to highest in that order.
By default, all traffic is classified as "Best Effort", meaning there is no prioritization applied. The other categories can be defined with the following values:
|802.1p Class of Service||TOS Range||DSCP Range||WME Category|
|0 - Best Effort||0x00-0x1f||0-7||Best Effort|
|1 - Background||0x20-0x3f||8-15||Background|
|2 - Spare||0x40-0x5f||16-23||Background|
|3 - Excellent Effort||0x60-0x7f||24-25, 28-31||Best Effort|
|4 - Controlled Load||0x80-0x9f||32-39||Video|
|5 - Video (<100ms latency)||0xa0-0xbf||40-45||Video|
|6 - Voice (<10ms latency)||0x68, 0xb8, 0xc0-0xdf||26-27, 46-47, 48-55||Voice|
|7 - Network Control||0xe0-0xff||56-63||Voice|
The bold TOS and DSCP ranges indicate special mapping cases starting from v5.5.4. Before v5.5.4 DSCP 46 go to WME Video, DSCP 26 go to WME Best Effort.