Classes 1 to 4 are referred to as AF classes. The following table illustrates the DSCP coding for specifying the AF class with the probability. Bits DS5, DS4 and DS3 define the class; bits DS2 and DS1 specify the drop probability; bit DS0 is always zero.
Drop | Class 1 | Class 2 | Class 3 | Class 4 |
---|---|---|---|---|
Low | 001010 AF11 DSCP 10 | 010010 AF21 DSCP 18 | 011010 AF31 DSCP 26 | 100010 AF41 DSCP 34 |
Medium | 001100 AF12 DSCP 12 | 010100 AF 22 DSCP 20 | 011100 AF32 DSCP 28 | 100100 AF42 DSCP 36 |
High | 001110 AF13 DSCP 14 | 010110 AF23 DSCP 22 | 011110 AF33 DSCP 30 | 100110 AF43 DSCP 38 |
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