3Com 5500-EI PWR Install Manual page 112

To do...
Set the voice VLAN aging timer
Enable the voice VLAN function
globally
Enter Ethernet port view
Enable the voice VLAN function
on a port
Set the CoS precedence and
DSCP precedence for voice
traffic
Enable the voice VLAN legacy
function on the port
Set the voice VLAN assignment
mode of the port to automatic
A port working in automatic voice VLAN assignment mode cannot be assigned to the voice VLAN
manually. Therefore, if a VLAN is configured as the voice VLAN and a protocol-based VLAN at the
same time, the protocol-based VLAN function cannot be bound with the port. For information about
protocol-based VLANs, refer to VLAN Configuration in this manual.
For a port operating in automatic voice VLAN assignment mode, its default VLAN cannot be
configured as the voice VLAN; otherwise the system prompts you for unsuccessful configuration.
When the voice VLAN is working normally, if the device restarts or the Unit ID of a device in a XRN
fabric changes, in order to make the established voice connections work normally, the system does not
need to be triggered by the voice traffic to add the port in automatic voice VLAN assignment mode to the
local devices as well as the XRN of the voice VLAN but does so immediately after the restart or the
changes.
Use the command...
voice vlan aging minutes
voice vlan vlan-id enable
interface interface-type
interface-number
voice vlan enable
voice vlan qos { cos-value
dscp-value | trust }
voice vlan legacy
voice vlan mode auto
1-8
Remarks
Optional
The default aging timer is 1440
minutes.
Required
Required
Required
By default, voice VLAN is
disabled.
Optional
By default, the switch sets the
CoS precedence to 6 and
DSCP precedence to 46 for
voice traffic automatically.
Optional
By default, voice VLAN legacy
is disabled.
Optional
The default voice VLAN
assignment mode on a port is
automatic.