Configuring The Cos-To-Dscp Map; Configuring The Ip-Precedence-To-Dscp Map - Cisco WS-C3750-48PS-S 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 32-12
Table 32-12 Default CoS-to-DSCP Map
CoS value
DSCP value
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:

Configuring the IP-Precedence-to-DSCP Map

You use the IP-precedence-to-DSCP map to map IP precedence values in incoming packets to a DSCP
value that QoS uses internally to represent the priority of the traffic.
Table 32-13
Table 32-13 Default IP-Precedence-to-DSCP Map
IP precedence value
DSCP value
Catalyst 3750 Switch Software Configuration Guide
32-50
shows the default CoS-to-DSCP map.
0 1
0 8
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
shows the default IP-precedence-to-DSCP map:
0 1
0 8
2 3 4 5
16 24 32 40
5 6 7
2 3 4
16 24 32
Chapter 32
6 7
48 56
5 6 7
40 48 56
Configuring QoS
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