Defining Aliases for CoS Value Bit Patterns
To define a CoS value 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 | ieee-802.1ad | inet-precedence) { alias-name bit-pattern; } }
The CoS marker types are as follows:
dscp—Differentiated Services code point aliases for IPv4 packets.dscp-ipv6—Differentiated Services code point aliases for IPv6 packets.exp—Layer 2 CoS values for MPLS packets.ieee-802.1—Layer 2 IEEE 802.1 CoS values.ieee-802.1—Layer 2 IEEE 802.1ad (DEI) CoS values.inet-precedence—IP precedence for IPv4 packets. IP precedence mapping requires only the first three bits of the DSCP field.
For example, you might configure the following aliases:
[edit class-of-service]
code-point-aliases {
dscp {
my1 110001;
my2 101110;
be 000001;
cs7 110000;
}
}
To specify this configuration:
This configuration produces the following 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
my1is a new alias.Nothing in the default mapping table is changed by this statement.
my2 101110:101110 is now mapped to
my2as well asef.
be 000001:beis 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:cs7is now mapped to 110000, as well asnc1andcs6.The old value of
cs7, 111000, is still mapped tonc2.