Voice Vlan Qos - 3Com 5500-EI PWR Reference Manual

You cannot and need not to assign a port working in automatic voice VLAN assignment mode to the
voice VLAN manually. When the port receives a packet whose source MAC address matches the OUI
list, the port is assigned to the voice VLAN automatically, and the packet is tagged with the voice VLAN
tag. If the port has not received any voice data before the voice VLAN aging timer expires, the port is
removed from the voice VLAN automatically.
By default, an Ethernet port works in automatic voice VLAN assignment mode.
A port working in manual voice VLAN assignment mode needs to be assigned to the voice VLAN
manually. The port stays in the voice VLAN no matter whether voice data is present on the port, that is,
the voice VLAN aging timer does not take effect on the port.
Related commands: display voice vlan status.
Examples
# Configure the voice VLAN assignment mode on Ethernet1/0/2 to manual.
<Sysname> system-view
System View: return to User View with Ctrl+Z.
[Sysname] interface Ethernet 1/0/2
[Sysname-Ethernet1/0/2] undo voice vlan mode auto

voice vlan qos

Syntax
voice vlan qos { cos-value dscp-value | trust }
undo voice vlan qos
View
Ethernet port view
Parameters
cos-value: Sets the CoS precedence marked for voice VLAN traffic, in the range 0 to 7.
dscp-value: Sets the DSCP precedence marked for voice VLAN traffic, in the range 0 to 63.
trust: Sets the port to trust the priorities of voice VLAN traffic passing through it, that is, the CoS
precedence or the DSCP precedence carried in voice VLAN traffic.
Description
Use the voice vlan qos command to modify the CoS precedence and DSCP precedence to be marked
for voice VLAN traffic.
Use the undo voice vlan qos command to restore the default.
By default, the CoS precedence and the DSCP precedence marked for voice VLAN traffic are 6 and 46.
After the CoS and DSCP precedence values marked for voice VLAN traffic are changed, the switch will
use the changed precedence values to look for the matching local precedence when queuing voice
VLAN traffic. For more information about local precedence and queuing, refer to the QoS-QoS Profile
part of this manual.
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