Cisco Support Community
cancel
Showing results for 
Search instead for 
Did you mean: 

How to compare QoS values for IP precedence, DSCP and MPLS EXP values along with standard values used in IOS Software for configuration

Core Issue

If different packet marking schemes are used in different parts of a VoIP network, then it is necessary to be able relate the values to each other to ensure consistent QoS characteristics across the network.

Resolution

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. For an introduction to this topic, refer to QoS for VoIP.

Per Hop Behavior (PHB)DSCP valueDSCP bitsIP precedence and Class of Service (COS) value (xyz000)Comment:MPLS EXP bits
Default00000000=routine        
  • Best effort
 
0

1000001



2000010



3000011



4000100



5000101



6000110



7000111


CS180010001=priority   

     
1

9001001


AF1110001010
        
  • Assured forwarding class 1 (001)
  • Drop priority 010 (1)
  • Dropped last in AF1 class
 


11001011


AF1212001100
        
  • Assured forwarding class 1 (001)
  • Drop priority 100 (2)
  • Dropped 2nd in AF1 class
 


13001101


AF1314001110
        
  • Assured forwarding class 1 (001)
  • Drop priority 110 (3)
  • Dropped first in AF1 class
 


15001111


CS2160100002=immediate
2

17010001


AF2118010010
        
  • Assured forwarding class 2 (010)
  • Drop priority 010 (1)
  • Dropped last in AF2 class
 


19010011


AF2220010100
        
  • Assured forwarding class 2 (010)
  • Drop priority 100 (2)
  • Dropped 2nd in AF2 class
 


21010101


AF2322010110
        
  • Assured forwarding class 2 (010)
  • Drop priority 110 (3)
  • Dropped first in AF2 class
 


23010111


CS3240110003=Flash
3

25011001


AF3126011010
        
  • Assured forwarding class 3 (011)
  • Drop priority 1 (010)
  • Dropped last in AF3 class
 


27011011


AF3228011100
        
  • Assured forwarding class 3 (011)
  • Drop priority 2 (100)
  • Dropped 2nd in AF3 class
 


29011101


AF3330011110
        
  • Assured forwarding class 3 (011)
  • Drop priority 3 (110)
  • Dropped first in AF3 class
 


31011111


CS4321000004=FlashOver
4

33100001


AF4134100010
        
  • Assured forwarding class 4 (100)
  • Drop priority 1 (010)
  • Dropped last in AF4 class
 


35100011


AF4236100100
        
  • Assured forwarding class 4 (100)
  • Drop priority 2 (100)
  • Dropped 2nd in AF4 class
 


37100101


AF4338100110
        
  • Assured forwarding class 4 (100)
  • Drop priority 3 (110)
  • Dropped first in AF4 class
 


39100111


CS5401010005=critical
5

41101001



42101010



43101011



44101100



45101101


EF46101110
Recommended Expedited Forwarding (EF) value (used for voice        traffic)

47101111


CS6481100006=internet
6

49110001



50110010



51110011



52110100



53110101



54110110



55110111


CS7561110007=network
7

57111001



58111010



59111011



60111100



61111101



62111110



63111111


Version history
Revision #:
1 of 1
Last update:
‎06-22-2009 03:39 PM
Updated by: