Cisco IE 3000 Software Configuration Manual page 613

Chapter 32 Configuring QoS
Command
Step 3
policy-map policy-map-name
Step 4 class class-map-name
Step 5 trust [cos | dscp | ip-precedence]
Step 6 set {dscp new-dscp | ip precedence
new-precedence}
OL-13018-01
Purpose
Create a policy map by entering the policy map name, and enter
policy-map configuration mode.
By default, no policy maps are defined.
The default behavior of a policy map is to set the DSCP to 0 if the
packet is an IP packet and to set the CoS to 0 if the packet is tagged. No
policing is performed.
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,
go to 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 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.
Cisco IE 3000 Switch Software Configuration Guide
Configuring Standard QoS
"Configuring the CoS-to-DSCP Map"
32-45