Configuring The Cos-To-Dscp Map - Cisco Catalyst 3750-X Software Configuration Manual

Configuring Standard QoS

Configuring the CoS-to-DSCP Map

You use the CoS-to-DSCP map to map CoS values in incoming packets to a DSCP value that QoS uses
internally to represent the priority of the traffic.
Table 39-12
Table 39-12
CoS Value
0
1
2
3
4
5
6
7
If these values are not appropriate for your network, you need to modify them.
Beginning in privileged EXEC mode, follow these steps to modify the CoS-to-DSCP map. This
procedure is optional.
Command
Step 1
configure terminal
Step 2 mls qos map cos-dscp dscp1...dscp8
Step 3 end
Step 4
show mls qos maps cos-dscp
Step 5
copy running-config startup-config
To return to the default map, use the no mls qos cos-dscp global configuration command.
This example shows how to modify and display the CoS-to-DSCP map:
Switch(config)# mls qos map cos-dscp 10 15 20 25 30 35 40 45
Switch(config)# end
Switch# show mls qos maps cos-dscp
Cos-dscp map:
Catalyst 3750-X and 3560-X Switch Software Configuration Guide
39-70
shows the default CoS-to-DSCP map.
Default CoS-to-DSCP Map
DSCP Value
0
8
16
24
32
40
48
56
Purpose
Enter global configuration mode.
Modify the CoS-to-DSCP map.
For dscp1...dscp8, enter eight DSCP values that correspond to CoS values
0 to 7. Separate each DSCP value with a space.
The DSCP range is 0 to 63.
Return to privileged EXEC mode.
Verify your entries.
(Optional) Save your entries in the configuration file.
cos: 0 1 2 3 4
--------------------------------
dscp: 10 15 20 25 30 35 40 45
5 6 7
Chapter 39 Configuring QoS
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