Cisco 300 Series Cli Manual page 777

Stackable managed switches

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no qos trust

cos— Specifies that ingress packets are classified with packet CoS values.

Untagged packets are classified with the default port CoS value.

dscp—Specifies that ingress packets are classified with packet DSCP

Default Configuration

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 QoS domain are classified at its edge. 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.

When the system is configured with trust DSCP, the traffic is mapped to the queue

by the DSCP-queue map.

When the system is configured with trust CoS, the traffic is mapped to the queue

by the CoS-queue map.

For an inter-QoS domain boundary, configure the port to the DSCP-trusted state

and apply the DSCP-to-DSCP-mutation map if the DSCP values are different in the

QoS domains.

The following example configures the system to the DSCP trust state.

switchxxxxxx(config)# qos trust dscp

Quality of Service (QoS) Commands

OL-32830-01 Command Line Interface Reference Guide