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Configuring the Switch
3-158
3
CLI – The following example globally enables IP Precedence service on the switch,
maps IP Precedence value 1 to CoS value 0 (on port 1), and then displays the IP
Precedence settings.
* Mapping specific values for IP Precedence is implemented as an interface configuration
command, but any changes will apply to the all interfaces on the switch.
Mapping DSCP Priority
The DSCP is six bits wide, allowing coding for up to 64 different forwarding
behaviors. The DSCP replaces the ToS bits, but it retains backward compatibility
with the three precedence bits so that non-DSCP compliant, ToS-enabled devices,
will not conflict with the DSCP mapping. Based on network policies, different kinds of
traffic can be marked for different kinds of forwarding. The DSCP default values are
defined in the following table. Note that all the DSCP values that are not specified
are mapped to CoS value 0.
Command Attributes
• DSCP Priority Table – Shows the DSCP Priority to CoS map.
• Class of Service Value – Maps a CoS value to the selected DSCP Priority value.
Note that “0” represents low priority and “7” represent high priority.
Note:
IP DSCP settings apply to all interfaces.
Console(config)#map ip precedence 4-212
Console(config)#interface ethernet 1/1 4-143
Console(config-if)#map ip precedence 1 cos 0 4-213
Console(config-if)#end
Console#show map ip precedence ethernet 1/1 4-216
Precedence mapping status: disabled
Port Precedence COS
--------- ---------- ---
Eth 1/ 1 0 0
Eth 1/ 1 1 0
Eth 1/ 1 2 2
Eth 1/ 1 3 3
Eth 1/ 1 4 4
Eth 1/ 1 5 5
Eth 1/ 1 6 6
Eth 1/ 1 7 7
Console#
Table 3-15 Mapping DSCP Priority
IP DSCP Value CoS Value
00
81
10, 12, 14, 16 2
18, 20, 22, 24 3
26, 28, 30, 32, 34, 36 4
38, 40, 42 5
48 6
46, 56 7