Mls Qos Cos - Cisco Catalyst 3550 Command Reference Manual
Multilayer switch
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Chapter 2
Catalyst 3550 Switch Cisco IOS Commands
mls qos cos
Use the mls qos cos interface configuration command to define the default class of service (CoS) value
of a port or assign the default CoS to all incoming packets on the port. Use the no form of this command
to return to the default setting.
Syntax Description
default-cos
override
Defaults
The default CoS value for a port is 0.
CoS override is disabled.
Command Modes
Interface configuration
Command History
Release
12.1(4)EA1
Usage Guidelines
You can use the default value to assign a CoS and DSCP value to all packets entering a port if the port
has been configured with the override keyword.
Use the override keyword when all incoming packets on certain ports deserve higher or lower priority
than packets entering from other ports. Even if a port is previously set to trust DSCP, CoS, or IP
precedence, this command overrides the previously configured trust state, and all the incoming CoS
values are assigned the default CoS value configured with the mls qos cos command. If an incoming
packet is tagged, the CoS value of the packet is modified with the default CoS of the port at the ingress
port.
Examples
This example shows how to configure the default port CoS to 4:
Switch(config)# interface gigabitethernet0/1
Switch(config-if)# mls qos trust cos
Switch(config-if)# mls qos cos 4
OL-8566-02
mls qos cos {default-cos | override}
no mls qos cos {default-cos | override}
Assign a default CoS value to a port. If the port is CoS trusted and packets are
untagged, the default CoS value becomes a CoS value used to select one output
queue to index into the CoS-to-Differentiated Services Code Point (DSCP) map. The
CoS range is 0 to 7.
Override the CoS of the incoming packets, and apply the default CoS value on the
port to all incoming packets.
Modification
This command was introduced.
Catalyst 3550 Multilayer Switch Command Reference
mls qos cos
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