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Chapter 32
Configuring QoS
Command
Step 4
class class-map-name
Step 5
trust [cos | dscp | ip-precedence]
Step 6
set {ip dscp new-dscp | ip precedence
new-precedence}
78-16180-02
Purpose
Define a traffic classification, and enter policy-map class configuration
mode.
By default, no policy map class-maps are defined.
If a traffic class has already been defined by using the class-map global
configuration command, specify its name for class-map-name in this
command.
Configure the trust state, which QoS uses to generate a CoS-based or
DSCP-based QoS label.
This command is mutually exclusive with the set command
Note
within the same policy map. If you enter the trust command,
then skip Step 6.
By default, the port is not trusted. If no keyword is specified when the
command is entered, the default is dscp.
The keywords have these meanings:
•
cos—QoS derives the DSCP value by using the received or default
port CoS value and the CoS-to-DSCP map.
dscp—QoS derives the DSCP value by using the DSCP value from
•
the ingress packet. For non-IP packets that are tagged, QoS derives
the DSCP value by using the received CoS value; for non-IP
packets that are untagged, QoS derives the DSCP value by using
the default port CoS value. In either case, the DSCP value is
derived from the CoS-to-DSCP map.
ip-precedence—QoS derives the DSCP value by using the IP
•
precedence value from the ingress packet and the
IP-precedence-to-DSCP map. For non-IP packets that are tagged,
QoS derives the DSCP value by using the received CoS value; for
non-IP packets that are untagged, QoS derives the DSCP value by
using the default port CoS value. In either case, the DSCP value is
derived from the CoS-to-DSCP map.
For more information, see the
section on page
32-50.
Classify IP traffic by setting a new value in the packet.
For ip dscp new-dscp, enter a new DSCP value to be assigned to
•
the classified traffic. The range is 0 to 63.
For ip precedence new-precedence, enter a new IP-precedence
•
value to be assigned to the classified traffic. The range is 0 to 7.
Catalyst 3750 Switch Software Configuration Guide
Configuring Standard QoS
"Configuring the CoS-to-DSCP Map"
32-45
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