3Com S7902E, Configuration Manual

Page: 182 / 2621

4-5
To do... Use the command... Remarks
Add a recognizable OUI
address
voice vlan mac-address oui
mask oui-mask
[ description
text ]
Optional
By default, each voice VLAN
has default OUI addresses
configured. Refer to
Table 4-1
for the default OUI addresses
of different vendors.
Enter Ethernet interface view
interface interface-type
interface-number
—
Configure the port to operate in
automatic voice VLAN
assignment mode
voice vlan mode auto
Optional
Automatic voice VLAN
assignment mode is enabled by
default.
The voice VLAN assignment
modes on different ports are
independent of one another.
Enable voice VLAN on the port voice vlan vlan-id enable
Required
Not enabled by default
A protocol-based VLAN on a hybrid port can process only untagged inbound packets, whereas the
voice VLAN in automatic mode on a hybrid port can process only tagged voice traffic. Therefore, do not
configure a VLAN as both a protocol-based VLAN and a voice VLAN. For more information, refer to
Protocol-Based VLAN Configuration .
Configuring the Priority Trust Setting for Voice VLAN Traffic on an Interface
In order to improve transmission quality of voice traffic, the device by default does not trust the priority
carried in voice VLAN traffic and re-marks the priority of the traffic in the voice VLAN as follows:
z
Set the CoS (802.1p) priority to 6.
z
Set the DSCP value to 46.
You can tune the priority values marked for incoming voice VLAN traffic on an interface. Alternatively,
you can configure the interface to trust and use the priority carried in incoming voice VLAN traffic
instead.
Follow these steps to configure the priority trust setting for voice VLAN traffic on an interface:
To do... Use the command... Remarks
Enter system view
system-view
—
Enter interface view
interface interface-type
interface-number
—