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Configuring Standard QoS
Command
Step 17
trust [cos | dscp | ip-precedence]
Step 18
set {dscp new-dscp | ip precedence
new-precedence}
Step 19
service-policy policy-map-name
Step 20
exit
Step 21
exit
Step 22
interface interface-id
Cisco Catalyst Blade Switch 3020 for HP Software Configuration Guide
32-56
Purpose
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,
omit Step 18.
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
32-60.
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.
Specify the interface-level policy-map name (from Step 10) and
associate it with the VLAN-level policy map.
If the VLAN-level policy map specifies more than one class, each class
can have a different service-policy policy-map-name command.
Return to policy-map configuration mode.
Return to global configuration mode.
Specify the SVI to which to attach the hierarchical policy map, and
enter interface configuration mode.
Chapter 32
"Configuring the CoS-to-DSCP Map"
Configuring QoS
OL-8915-03
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