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mls qos dscp-mutation
mls qos dscp-mutation
Use the mls qos dscp-mutation interface configuration command to apply a Differentiated Services
Code Point (DSCP)-to-DSCP-mutation map to a DSCP-trusted port. Use the no form of this command
to return the map to the default settings (no DSCP mutation).
Syntax Description
dscp-mutation-name
Defaults
The default DSCP-to-DSCP-mutation map is a null map, which maps incoming DSCPs to the same
DSCP values.
Command Modes
Interface configuration
Command History
Release
12.1(19)EA1
Usage Guidelines
If two quality of service (QoS) domains have different DSCP definitions, use the
DSCP-to-DSCP-mutation map to translate one set of DSCP values to match the definition of another
domain. You apply the DSCP-to-DSCP-mutation map to the receiving port (ingress mutation) at the
boundary of a quality of service (QoS) administrative domain.
With ingress mutation, the new DSCP value overwrites the one in the packet, and QoS handles the packet
with this new value. The switch sends the packet out the port with the new DSCP value.
You can configure multiple DSCP-to-DSCP-mutation maps on ingress ports.
You apply the map only to DSCP-trusted ports. If you apply the DSCP mutation map to an untrusted
port, to class of service (CoS) or IP-precedence trusted port, the command has no immediate effect until
the port becomes DSCP-trusted.
Examples
This example shows how to define the DSCP-to-DSCP-mutation map named dscpmutation1and to apply
the map to a port:
Switch(config)# mls qos map dscp-mutation dscpmutation1 10 11 12 13 to 30
Switch(config)# interface gigabitethernet0/1
Switch(config-if)# mls qos trust dscp
Switch(config-if)# mls qos dscp-mutation dscpmutation1
Catalyst 3560 Switch Command Reference
2-244
mls qos dscp-mutation dscp-mutation-name
no mls qos dscp-mutation dscp-mutation-name
Modification
This command was introduced.
Chapter 2
Name of the DSCP-to-DSCP-mutation map. This map was previously
defined with the mls qos map dscp-mutation global configuration
command.
Catalyst 3560 Switch Cisco IOS Commands
78-16405-05
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