26-59
Catalyst 3750 Metro Switch Software Configuration Guide
78-15870-01
Chapter 26 Configuring QoS
Configuring Standard QoS
Switch(config)# interface gigabitethernet1/0/1
Switch(config-if)# service-policy input aggflow1
Switch(config-if)# exit
Configuring DSCP Maps
These sections describe how to configure the DSCP maps:
• Configuring the CoS-to-DSCP Map, page 26-59 (optional)
• Configuring the IP-Precedence-to-DSCP Map, page 26-60 (optional)
• Configuring the Policed-DSCP Map, page 26-61 (optional, unless the null settings in the map are
not appropriate)
• Configuring the DSCP-to-CoS Map, page 26-62 (optional)
• Configuring the DSCP-to-DSCP-Mutation Map, page 26-63 (optional, unless the null settings in the
map are not appropriate)
All the maps, except the DSCP-to-DSCP-mutation map, are globally defined and are applied to all ports.
Configuring the CoS-to-DSCP Map
You use the CoS-to-DSCP map to map CoS values in inbound packets to a DSCP value that QoS uses
internally to represent the priority of the traffic.
Table 26-12 shows the default CoS-to-DSCP map.
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.
To return to the default map, use the no mls qos cos-dscp global configuration command.
Table 26-12 Default CoS-to-DSCP Map
CoS value 0 1 2 3 4 5 6 7
DSCP value 0 8 16 24 32 40 48 56
Command Purpose
Step 1
configure terminal Enter global configuration mode.
Step 2
mls qos map cos-dscp dscp1...dscp8 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.
Step 3
end Return to privileged EXEC mode.
Step 4
show mls qos maps cos-dscp Verify your entries.
Step 5
copy running-config startup-config (Optional) Save your entries in the configuration file.
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