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

-- MatjazStraus - 01 Oct 2007

Topic revision: r1 - 2007-10-01 - MatjazStraus
 
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