Cisco Catalyst 3750 Metro - Mls Qos Cos

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Catalyst 3750 Metro Switch Command Reference
OL-9645-10
Chapter 2 Catalyst 3750 Metro Switch Cisco IOS Commands
mls qos cos
mls qos cos
Use the mls qos cos interface configuration command to define the default class of service (CoS) value
of a port or to assign the default CoS to all inbound packets on the port. Use the no form of this command
to return to the default setting.
mls qos cos {default-cos | override}
no mls qos cos {default-cos | override}
Syntax Description
Defaults The default CoS value for a port is 0.
CoS override is disabled.
Command Modes Interface configuration
Command History
Usage Guidelines You can use the default value to assign a CoS and Differentiated Services Code Point (DSCP) value to
all inbound packets that are untagged (if the inbound packet does not have a CoS value). You also can
assign a default CoS and DSCP value to all inbound packets by using the override keyword.
Use the override keyword when all inbound 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 inbound CoS
values are assigned the default CoS value configured with the mls qos cos command. If an inbound
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 on a port:
Switch(config)# interface gigabitethernet1/0/1
Switch(config-if)# mls qos trust cos
Switch(config-if)# mls qos cos 4
default-cos Assign a default CoS value to a port. If packets are untagged, the default CoS value
becomes the packet CoS value. The CoS range is 0 to 7.
override Override the CoS of the inbound packets, and apply the default CoS value on the port
to all inbound packets.
Release Modification
12.1(14)AX This command was introduced.