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Default Aliases for CoS Value Bit Patterns Overview

Behavior aggregate (BA) classifiers use class-of-service (CoS) values—such as Differentiated Services code points (DSCPs), DSCP IPv6, IP precedence, IEEE 802.1, and MPLS experimental (EXP) bits—to associate incoming packets with a particular CoS servicing level (forwarding class and packet loss priority (PLP)). You can assign a meaningful name or alias to the CoS values and use this alias instead of bits when configuring CoS components. These aliases are not part of the specifications but are well known through usage. For example, the alias for DSCP 101110 is widely accepted as ef (expedited forwarding).

Note:

CoS value aliases must begin with a letter and can be up to 64 characters long.

When you define classifiers, you can refer to the markers by alias names. You can configure user-defined classifiers in terms of alias names. If the value of an alias changes, it alters the behavior of any classifier that references it.

Table 1 shows the default mappings between the CoS values and standard aliases.

Table 1: Default CoS Value Aliases

Default CoS Value Alias

CoS Value

DSCP and DSCP IPv6 CoS Aliases and CoS Values

ef

101110

af11

001010

af12

001100

af13

001110

af21

010010

af22

010100

af23

010110

af31

011010

af32

011100

af33

011110

af41

100010

af42

100100

af43

100110

be

000000

cs1

001000

cs2

010000

cs3

011000

cs4

100000

cs5

101000

nc1/cs6

110000

nc2/cs7

111000

MPLS EXP CoS Aliases and CoS Values

be

000

be1

001

ef

010

ef1

011

af11

100

af12

101

nc1/cs6

110

nc2/cs7

111

IEEE 802.1 CoS Aliases and CoS Values

be

000

be1

001

ef

010

ef1

011

af11

100

af12

101

nc1/cs6

110

nc2/cs7

111

IEEE 802.1ad CoS Aliases and CoS Values

be

0000

be-dei

0001

be1

0010

be1-dei

0011

ef

0100

ef-dei

0101

ef1

0110

ef1-dei

0111

af11

1000

af11-dei

1001

af12

1010

af12-dei

1011

nc1

1100

nc1-dei

1101

nc2

1110

nc2-dei

1111

Legacy IP Precedence CoS Aliases and CoS Values

be

000

be1

001

ef

010

ef1

011

af11

100

af12

101

nc1/cs6

110

nc2/cs7

111