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TOS (type of service)

TOS byte

7

6

5

4

3

2

1

0

8 bits

IP precedence

PREC

 

 

-

-

-

-

-

upper 3 bits

DiffServ code point

DSCP

 

 

 

 

 

-

-

upper 6 bits

DSCP {{ TOS>>2 }} TOS/4

IP PREC {{ TOS>>5 }} T0S/32 = DSCP/8

Here are some standard values:

TOS

IP Prec

DSCP

 

 

0

0

Default

000000

0

32

1

CS1

001000

8

40

1

AF11

001010

10

 

1

AF12

001100

12

 

1

AF13

001110

14

64

2

CS2

010000

16

 

2

AF21

010010

18

 

2

AF22

010100

20

 

2

AF23

010110

22

96

3

CS3

011000

24

 

3

AF31

011010

26

 

3

AF32

011100

28

 

3

AF33

011110

30

128

4

CS4

100000

32

 

4

AF41

100010

34

 

4

AF42

100100

36

 

4

AF43

100110

38

160

5

CS5

101000

40

184

5

EF

101110

46

192

6

CS6

110000

48

224

7

CS7

111000

56

– Main.MatjazStraus - 01 Oct 2007

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