H3C Technologies H3C WX3000E Series Wireless Switches - Manual (Page 120)

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Configuring QoS priority settings for voice traffic on an
interface
In voice VLAN applications, you can improve the quality of voice traffic by configuring the appropriate
QoS priority settings, including the Class of Service (CoS) and Differentiated Services Code Point (DSCP)
values, for voice traffic. Voice traffic carries its own QoS priority settings. You can configure the device
either to modify or not to modify the QoS priority settings carried by incoming voice traffic.
Follow these steps to configure QoS priority settings for voice traffic:
To do... Use the command... Remarks
Enter system view system-view —
Enter interface view
interface interface-type
interface-number
—
Configure the interface to trust the
QoS priority settings in incoming
voice traffic, but not to modify the
CoS and DSCP values marked for
incoming traffic of the voice VLAN
voice vlan qos trust
Required
Use either command
By default, an interface modifies the
CoS value and the DSCP value
marked for voice VLAN traffic into 6
and 46 respectively.
The voice vlan qos command and the
voice vlan qos trust command can
overwrite each other, whichever is
configured last.
Configure the interface to modify
the CoS and DSCP values marked
for incoming traffic of the voice
VLAN into specified values
voice vlan qos cos-value
dscp-value
NOTE:
Configure the QoS priority settings for voice traffic on an interface before enabling voice VLAN on the
interface. If the configuration order is reversed, your priority trust setting will fail.
Configuring a port to operate in automatic voice VLAN
assignment mode
Follow these steps to set a port to operate in automatic voice VLAN assignment mode:
To do... Use the command... Remarks
Enter system view system-view —
Set the voice VLAN aging time voice vlan aging minutes
Optional
By default, the aging time of a
voice VLAN is 1440 minutes.
The voice VLAN aging time
configuration is only applicable on
ports in automatic voice VLAN
assignment mode.
Enable the voice VLAN security
mode
voice vlan security enable
Optional
By default, the voice VLAN security
mode is enabled.