Qos trust dscp – Brocade Network OS Command Reference v4.1.0 User Manual

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Network OS Command Reference

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qos trust dscp

Enables Differentiated Services Code Point (DSCP) mode for incoming traffic.

Synopsis

qos trust dscp

no qos trust dscp

Operands

None

Defaults

The QoS trust DSCP mode set to the untrusted state.

Command Modes

Interface subtype configuration mode

Description

Use this command to specify the interface ingress QoS trust DSCP mode, which controls user
priority mapping of incoming traffic. The untrusted mode overrides all incoming priority markings
with the Interface Default CoS. The DSCP trust mode sets the user priority based on the incoming
DSCP value, When this feature is not enabled, DSCP values in the packet are ignored.

When DSCP trust is enabled, the following lists the default mapping of DSCP values to user priority.

Usage Guidelines

QoS Trust Mode is automatically applied if dscp-cos map or qos dscp traffic class is applied to the
interface.

Enter no qos trust dscp to return to the default.

Examples

To set the interface QoS to DCSP trust mode on a specific 10-gigabit Ethernet interface:

switch(config)# interface tengigabitethernet 178/0/9

switch(conf-if-te-178/0/9)# qos trust dscp

To return the interface QoS to the default value or to the untrusted state:

switch(config)# interface tengigabitethernet 178/0/9

switch(conf-if-te-178/0/9)# no qos trust dscp

NOTE

This command is only supported on Brocade VDX 8770-4, VDX 8770-8, and later switches.