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User Guidelines
Queue settings for 3, 11, 19, ... cannot be modified.
Example
The following example maps DSCP values 33, 40 and 41 to queue 1.
Console (config)# qos map dscp-queue 33 40 41 to 1
3.17.8 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
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cos — Classifies ingress packets with the packet CoS values. For untagged packets, the port default CoS is used.
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dscp — Classifies ingress packets with the packet DSCP values.
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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
3.17.9 qos trust (Interface)
The qos trust interface configuration command enables each port trust state while the system is in basic mode.
To disable the trust state on each port, use the no form of this command.
Syntax
qos trust
no qos trust
Default Configuration
Each port is enabled while the system is in basic mode.
Command Mode
Interface Configuration (Ethernet, port-channel) mode
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