DSCP to COS…

Two Most used field/bit in IP/Layer 2 header for QoS of VoIP. For people to flexible switch between, Cisco has the following table to match values

DSCP (Decimal) – DSCP – CoS

0 – Default – 0

8 – CS1 – 1

10 – AF11 – 1

12 – AF12 – 1

14 – AF13 – 1

16 – CS2 – 2

18 – AF21 – 2

20 – AF22 – 2

22 – AF23 – 2

24 – CS3 – 3

26 – AF31 – 3

28 – AF32 – 3

30 – AF33 – 3

32 – CS4 – 4

34 – AF41 – 4

36 – AF42 – 4

38 – AF43 – 4

40 – CS5 – 5

42 – – 5

44 – – 5

46 – EF – 5

48 – CS6 – 6

56 – CS7 – 7

However for whatever the reason, Cisco requires you to manually type in following command to truely get the mapping:

Switch(config)#mls qos map cos-dscp 0 8 16 24 32 46 48 56

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