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5.17.8 qos trust (Global)
The qos trust global configuration command can be used in basic mode to configure the system to
"trust" state.
To return to the default state, use the no form of this command.
Syntax
qos trust {cos | dscp | tcp-udp-port}}
no qos trust
cos — Classifies ingress packets with the packet CoS values. For untagged packets, the port
default CoS is used.
dscp — Classifies ingress packets with the packet DSCP values.
tcp-udp-port — Classifies ingress packets with the packet destination port values.
Default Configuration
If the system is in basic mode then CoS is the default trust mode.
Command Mode
Global Configuration mode
User Guidelines
This command can be used only in QoS basic mode.
Packets entering a quality of service (QoS) domain are classified at the edge of the QoS domain. When
the packets are classified at the edge, the switch port within the QoS domain can be configured to one of
the trusted states because there is no need to classify the packets at every switch within the domain.
Use this command to specify whether the port is trusted and which fields of the packet to use to classify
traffic.
DSCP value 0-7 8-15 16-23 24-31 32-39 40-47 48-56 57-63
Queue-ID 1 2 3 4 5 6 7 8
For an inter-QoS domain boundary, the port can be configured to the DSCP-trusted state and apply the
DSCP-to-DSCP-mutation map, if the DSCP values are different between the QoS domains.
To return to the untrusted state, use the no qos command to apply best effort service.
Example
The following example configures the system in basic mode to DSCP trust state.
Console (config)# qos trust dscp
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