Defining Aliases for Bits

To define a code-point alias, include the code-point-aliases statement at the [edit class-of-service] hierarchy level:



[edit class-of-service]

code-point-aliases {


(dscp | dscp-ipv6 | exp | ieee-802.1 | inet-precedence)
{

alias-name bits;
}


}

The CoS marker types are as follows:

dscp—Handles incoming IPv4 packets.
dscp-ipv6—Handles incoming IPv6 packets. For more information, see Applying DSCP IPv6 Classifiers.
exp—Handles MPLS packets using Layer 2 headers.
ieee-802.1—Handles Layer 2 CoS.
inet-precedence—Handles incoming IPv4 packets. IP precedence mapping requires only the upper three bits of the DSCP field.

For example, you might set up the following configuration:



[edit class-of-service]
code-point-aliases {


dscp {
my1 110001;
my2 101110;
be 000001;
cs7 110000;
}


}

The sample configuration produces this mapping:

user@host> show class-of-service code-point-aliases
dscp

Code point type: dscp

Alias              Bit pattern

ef/my2             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                 000001

cs1                001000

cs2                010000

cs3                011000

cs4                100000

cs5                101000

nc1/cs6/cs7        110000

nc2                111000

my1                110001

The following notes explain certain results in the mapping:

my1 110001:
- 110001 was not mapped to anything before, and my1 is a new alias.
- Nothing in the default mapping table is changed by this statement.
my2 101110:
- 101110 is now mapped to my2 as well as ef.
be 000001:
- be is now mapped to 000001.
- The old value of be, 000000, is not associated with any alias. Packets with this DSCP value are now mapped to the default forwarding class.
cs7 110000:
- cs7 is now mapped to 110000, as well as nc1 and cs6.
- The old value of cs7, 111000, is still mapped to nc2.