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airMAX - QoS and Prioritization

ATTENTION: This article is currently under review and might be outdated.

Overview


This article describes how QoS and prioritization is handled by airMAX.


Table of Contents


  1. Introduction
  2. Traffic Categories

Introduction


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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.  


Traffic Categories


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There are four traffic categories: Background, Best Effort, 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 Traffic 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 26-27, 46-47 Voice
7 - Network Control 0xe0-0xff 56-63 Voice