13-12
Catalyst 2950 Desktop Switch Software Configuration Guide
78-11380-03
Chapter 13 Configuring QoS
Configuring 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 13-13. For information on how to configure the CoS-to-DSCP map, see the
“Configuring the CoS-to-DSCP Map” sectiononpage13-21.
Command Purpose
Step 1
configure terminal Enter global configuration mode.
Step 2
interface interface-id Enter interface configuration mode, and specify the interface to be
trusted.
Valid interfaces include physical interfaces.
Step 3
mls qos trust [cos | dscp] Configure the port trust state.
By default, the port is not trusted.
Use the cos keyword setting if your network is composed of Ethernet
LANs, Catalyst 2950 switches, and has no more than two types of
traffic.
Use the dscp keyword if your network is not composed of only
Ethernet LANs and if you are familiar with sophisticated QoS
features and implementations.
Enter the cos keyword if you want ingress packets to be classified
with the packet CoS values. For tagged IP packets, the DSCP value
of the packet is modified based on the CoS-to-DSCP map. The egress
queue assigned to the packet is based on the packet CoS value.
Enter the dscp keyword if you want ingress packets to be classified
with packet DSCP values. For non-IP packets, the packet CoS value
is used for tagged packets; the default port CoS is used for untagged
packets. Internally, the switch modifies the CoS value by using the
DSCP-to-CoS map.
For more information on this command, refer to the
Catalyst 2950 Desktop Switch Command Reference.
Step 4
end Return to privileged EXEC mode.
Step 5
show mls qos interface [interface-id]
[policers]
Verify your entries.
Step 6
copy running-config startup-config (Optional) Save your entries in the configuration file.
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