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Catalyst 3560 Switch Software Configuration Guide
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Chapter 28 Configuring QoS
Configuring Standard QoS
Beginning in privileged EXEC mode, follow these steps to configure the port to trust the classification
of the traffic that it receives:
To return a port to its untrusted state, use the no mls qos trust interface configuration command.
For information on how to change the default CoS value, see the “Configuring the CoS Value for an
Interface” section on page 28-33. For information on how to configure the CoS-to-DSCP map, see the
“Configuring the CoS-to-DSCP Map” section on page 28-47.
Command Purpose
Step 1
configure terminal Enter global configuration mode.
Step 2
interface interface-id Specify the port to be trusted, and enter interface configuration
mode.
Valid interfaces include physical ports.
Step 3
mls qos trust [cos | dscp | ip-precedence] Configure the port trust state.
By default, the port is not trusted. If no keyword is specified, the
default is dscp.
The keywords have these meanings:
• cos—Classifies an ingress packet by using the packet CoS value.
For an untagged packet, the port default CoS value is used. The
default port CoS value is 0.
• dscp—Classifies an ingress packet by using the packet DSCP
value. For a non-IP packet, the packet CoS value is used if the
packet is tagged; for an untagged packet, the default port CoS is
used. Internally, the switch maps the CoS value to a DSCP value
by using the CoS-to-DSCP map.
• ip-precedence—Classifies an ingress packet by using the packet
IP-precedence value. For a non-IP packet, the packet CoS value
is used if the packet is tagged; for an untagged packet, the default
port CoS is used. Internally, the switch maps the CoS value to a
DSCP value by using the CoS-to-DSCP map.
Step 4
end Return to privileged EXEC mode.
Step 5
show mls qos interface Verify your entries.
Step 6
copy running-config startup-config (Optional) Save your entries in the configuration file.
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