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QoS values for IP precedence, DSCP and MPLS EXP

November 20th, 2010

This table compares QoS values for IP precedence, Differentiated Services Code Point (DSCP) and Multiprotocol Label Switching (MPLS) Experimental (EXP) values along with standard values used in Cisco IOS  Software for configuration.

Per Hop Behavior (PHB) DSCP value DSCP bits IP precedence and Class of Service (COS) value (xyz000) Comment: MPLS EXP bits
Default 0 000000 0=routine
  • Best effort
1 000001
2 000010
3 000011
4 000100
5 000101
6 000110
7 000111
CS1 8 001000 1=priority

9 001001
AF11 10 001010
  • Assured forwarding class 1 (001)
  • Drop priority 010 (1)
  • Dropped last in AF1 class
11 001011
AF12 12 001100
  • Assured forwarding class 1 (001)
  • Drop priority 100 (2)
  • Dropped 2nd in AF1 class
13 001101
AF13 14 001110
  • Assured forwarding class 1 (001)
  • Drop priority 110 (3)
  • Dropped first in AF1 class
15 001111
CS2 16 010000 2=immediate 1
17 010001
AF21 18 010010
  • Assured forwarding class 2 (010)
  • Drop priority 010 (1)
  • Dropped last in AF2 class
19 010011
AF22 20 010100
  • Assured forwarding class 2 (010)
  • Drop priority 100 (2)
  • Dropped 2nd in AF2 class
21 010101
AF23 22 010110
  • Assured forwarding class 2 (010)
  • Drop priority 110 (3)
  • Dropped first in AF2 class
23 010111
CS3 24 011000 3=Flash 2
25 011001
AF31 26 011010
  • Assured forwarding class 3 (011)
  • Drop priority 1 (010)
  • Dropped last in AF3 class
27 011011
AF32 28 011100
  • Assured forwarding class 3 (011)
  • Drop priority 2 (100)
  • Dropped 2nd in AF3 class
29 011101
AF33 30 011110
  • Assured forwarding class 3 (011)
  • Drop priority 3 (110)
  • Dropped first in AF3 class
31 011111
CS4 32 100000 4=FlashOver 3
33 100001
AF41 34 100010
  • Assured forwarding class 4 (100)
  • Drop priority 1 (010)
  • Dropped last in AF4 class
35 100011
AF42 36 100100
  • Assured forwarding class 4 (100)
  • Drop priority 2 (100)
  • Dropped 2nd in AF4 class
37 100101
AF43 38 100110
  • Assured forwarding class 4 (100)
  • Drop priority 3 (110)
  • Dropped first in AF4 class
39 100111
CS5 40 101000 5=critical 1
41 101001
42 101010
43 101011
44 101100
45 101101
EF 46 101110 Recommended Expedited Forwarding (EF) value (used for voice        traffic) 6
47 101111
CS6 48 110000 6=internet 0
49 110001
50 110010
51 110011
52 110100
53 110101
54 110110
55 110111
CS7 56 111000 7=network 4
57 111001
58 111010
59 111011
60 111100
61 111101
62 111110
63 111111
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