Configuring A Qos Policy - Cisco Catalyst 3550 series Software Configuration Manual

Chapter 29 Configuring QoS
Command
Step 6 mls qos dscp-mutation
dscp-mutation-name
Step 7
end
Step 8 show mls qos maps dscp-mutation
Step 9
copy running-config startup-config
To return a port to its non-trusted state, use the no mls qos trust interface configuration command. To
return to the default DSCP-to-DSCP-mutation map values, use the no mls qos map dscp-mutation
dscp-mutation-map-name global configuration command.
This example shows how to configure Gigabit Ethernet port 0/2 to the DSCP-trusted state and to modify
the DSCP-to-DSCP-mutation map (named gi0/2-mutation) so that incoming DSCP values 10 to 13 are
mapped to DSCP values 30:
Switch# configure terminal
Switch(config)# mls qos map dscp-mutation gi0/2-mutation 10 11 12 13 to 30
Switch(config)# interface gigabitethernet0/2
Switch(config-if)# mls qos trust dscp
Switch(config-if)# mls qos dscp-mutation gi0/2-mutation
Switch(config-if)# end

Configuring a QoS Policy

Configuring a QoS policy typically requires classifying traffic into classes, configuring policies applied
to those traffic classes, and attaching policies to interfaces.
For background information, see the
Marking" section on page
These sections how to configure a QoS policy:
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78-11194-09
29-8.
Classifying Traffic by Using ACLs, page 29-36
Classifying Traffic on a Physical-Port Basis by Using Class Maps, page 29-39
Classifying Traffic on a Per-Port Per-VLAN Basis by Using Class Maps, page 29-41
Classifying, Policing, and Marking Traffic by Using Policy Maps, page 29-43
Classifying, Policing, and Marking Traffic by Using Aggregate Policers, page 29-49
Purpose
Apply the map to the specified ingress DSCP-trusted port.
You can apply the map to different Gigabit-capable Ethernet ports.
However, on 10/100 Ethernet ports, you can attach only one
DSCP-to-DSCP-mutation map to a group of twelve ports. For example,
Fast Ethernet ports 0/1 to 0/12 are a group, Fast Ethernet ports 0/13 to
0/24 are a group, Gigabit Ethernet 0/1 is a group, and Gigabit Ethernet
0/2 is a group. When applying a mutation map to any port in a group,
all ports in the same group are automatically configured with the same
map.
Return to privileged EXEC mode.
Verify your entries.
(Optional) Save your entries in the configuration file.
"Classification" section on page 29-5
Catalyst 3550 Multilayer Switch Software Configuration Guide
Configuring Standard QoS
and the "Policing and
29-35