Mls Qos Dscp-Mutation - Cisco Catalyst 3550 Command Reference Manual

Chapter 2 Cisco IOS Commands

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 DSCP-to-DSCP-mutation 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(4)EA1
Usage Guidelines You apply the DSCP-to-DSCP-mutation map to a port at the boundary of a quality of service (QoS)
administrative domain. If two QoS domains have different DSCP definitions between them, you use the
DSCP-to-DSCP-mutation map to translate a set of DSCP values to match the definition of another
domain. You apply the map only to ingress and to DSCP-trusted ports. Applying this map to a port causes
IP packets to be rewritten with newly mapped DSCP values at the ingress 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.
You can have multiple DSCP-to-DSCP-mutation maps and apply them 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 port 0/1 is a group, and Gigabit Ethernet port 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.
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
78-11195-09
mls qos dscp-mutation dscp-mutation-name
no mls qos dscp-mutation dscp-mutation-name
Modification
This command was first introduced.
Name of the DSCP-to-DSCP-mutation map, which was previously
defined with the mls qos map dscp-mutation global configuration
command.
Catalyst 3550 Multilayer Switch Command Reference
mls qos dscp-mutation
2-169