3Com 4200G 12-Port - Voice VLAN Configuration; Configuration Prerequisites; Configuring the Voice VLAN to Operate in Automatic Voice VLAN Assignment Mode

1-7
The following table presents how a packet is handled when the voice VLAN is operating in security
mode and normal mode.
Table 1-4 How a packet is handled when the voice VLAN is operating in different modes
Voice VLAN Mode Packet Type Processing Method
Untagged packet
Packet carrying the voice VLAN
tag
If the source MAC address of
the packet matches the OUI
list, the packet is transmitted in
the voice VLAN. Otherwise, the
packet is dropped.
Security
Packet carrying any other
VLAN tag
The packet is forwarded or
dropped based on whether the
receiving port is assigned to the
carried VLAN. The processing
method is irrelevant to the voice
VLAN mode (security or
normal).
Untagged packet
Packet carrying the voice VLAN
tag
The source MAC address of the
packet is not checked. All such
packets can be transmitted in
the voice VLAN.
Normal
Packet carrying any other
VLAN tag
The packet is forwarded or
dropped based on whether the
port is assigned to the carried
VLAN. The processing method
is irrelevant to the voice VLAN
mode (security or normal).
Voice VLAN Configuration
Configuration Prerequisites
z Create the corresponding VLAN before configuring a voice VLAN.
z VLAN 1 (the default VLAN) cannot be configured as a voice VLAN.
Configuring the Voice VLAN to Operate in Automatic Voice VLAN Assignment
Mode
Follow these steps to configure a voice VLAN to operate in automatic voice VLAN assignment mode:
To do… Use the command… Remarks
Enter system view
system-view
—
Set an OUI address that can be
identified by the voice VLAN
voice vlan mac-address oui
mask oui-mask [ description
text ]
Optional
By default, the switch
determines the voice traffic
according to the default OUI
address.
Enable the voice VLAN security
mode
voice vlan security enable
Optional
By default, the voice VLAN
security mode is enabled.