DSCP/DiffServ and IP PrecedenceΒΆ
Differentiated Services Code Point (DSCP) is a means of classifying and managing network traffic and of providing quality of service (QoS) in modern Layer 3 IP networks. It uses the 6-bit Differentiated Services (DS) field in the IP header for the purpose of packet classification.
IP Precedence is another means to classify and differentiate traffic in a Quality of Service enabled network. The relationship between DSCP and IP Precedence is detailed in the table below.
DSCP name |
DS (binary) |
DS (decimal) |
IP Precedence |
|---|---|---|---|
CS0 |
000000 |
0 |
0 |
CS1 |
001000 |
8 |
1 |
AF11 |
001010 |
10 |
1 |
AF12 |
001100 |
12 |
1 |
AF13 |
001110 |
14 |
1 |
CS2 |
010000 |
16 |
2 |
AF21 |
010010 |
18 |
2 |
AF22 |
010100 |
20 |
2 |
AF23 |
010110 |
22 |
2 |
CS3 |
011000 |
24 |
3 |
AF31 |
011010 |
26 |
3 |
AF32 |
011100 |
28 |
3 |
AF33 |
011110 |
30 |
3 |
CS4 |
100000 |
32 |
4 |
AF41 |
100010 |
34 |
4 |
AF42 |
100100 |
36 |
4 |
AF43 |
100110 |
38 |
4 |
CS5 |
101000 |
40 |
5 |
EF |
101110 |
46 |
5 |
CS6 |
110000 |
48 |
6 |
CS7 |
111000 |
56 |
7 |