QoS Cheat Sheet
A quick-reference for Quality of Service values. Look up DSCP and CoS markings, their meanings, and typical use cases for prioritizing network traffic.
| Name | Value | Meaning | Typical Use Case |
|---|---|---|---|
CS0 | 0 (000000) | Best Effort (BE) | Default traffic, non-critical data |
CS1 | 8 (001000) | Class Selector 1 | Low-priority data (e.g., bulk data, FTP) |
AF11 | 10 (001010) | Assured Forwarding | High-throughput data, network management |
AF12 | 12 (001100) | Assured Forwarding | High-throughput data, network management |
AF13 | 14 (001110) | Assured Forwarding | High-throughput data, network management |
CS2 | 16 (010000) | Class Selector 2 | Transactional data (e.g., SAP, database) |
AF21 | 18 (010010) | Assured Forwarding | Low-latency data (e.g., streaming video) |
AF22 | 20 (010100) | Assured Forwarding | Low-latency data (e.g., streaming video) |
AF23 | 22 (010110) | Assured Forwarding | Low-latency data (e.g., streaming video) |
CS3 | 24 (011000) | Class Selector 3 | Voice signaling (e.g., SIP, H.323) |
AF31 | 26 (011010) | Assured Forwarding | Broadcast video, multimedia conferencing |
AF32 | 28 (011100) | Assured Forwarding | Broadcast video, multimedia conferencing |
AF33 | 30 (011110) | Assured Forwarding | Broadcast video, multimedia conferencing |
CS4 | 32 (100000) | Class Selector 4 | Real-time interactive (e.g., video conferencing) |
AF41 | 34 (100010) | Assured Forwarding | Real-time interactive (e.g., video conferencing) |
AF42 | 36 (100100) | Assured Forwarding | Real-time interactive (e.g., video conferencing) |
AF43 | 38 (100110) | Assured Forwarding | Real-time interactive (e.g., video conferencing) |
CS5 | 40 (101000) | Class Selector 5 | Broadcast Video (e.g., IPTV) |
EF | 46 (101110) | Expedited Forwarding | Voice (VoIP), real-time critical traffic |
CS6 | 48 (110000) | Class Selector 6 | Network control (e.g., routing protocols like OSPF, EIGRP) |
CS7 | 56 (111000) | Class Selector 7 | Network control (reserved for network use) |