3Com E4500-24 Cli Configuration Manual page 107

The MAC address of IP phone A is 0011-1100-0001. The phone connects to a downstream device
named PC A whose MAC address is 0022-1100-0002 and to GigabitEthernet 1/0/1 on an upstream
device named Device A.
The MAC address of IP phone B is 0011-2200-0001. The phone connects to a downstream device
named PC B whose MAC address is 0022-2200-0002 and to Ethernet GigabitEthernet1/0/2 on
Device A.
Device A uses voice VLAN 2 to transmit voice packets for IP phone A and IP phone B.
Configure GigabitEthernet 1/0/1 and GigabitEthernet 1/0/2 to work in automatic voice VLAN
assignment mode. In addition, if one of them has not received any voice packet in 30 minutes, the
port is removed from the corresponding voice VLAN automatically.
Network diagram
Figure 1-2 Network diagram for voice VLAN configuration (automatic mode)
VLAN 2
IP phone A
010-1001
MAC: 0011-1100-0001
Mask: ffff-ff00-0000
PC A
MAC: 0022-1100-0002
Configuration procedure
# Create VLAN 2.
<DeviceA> system-view
[DeviceA] vlan 2
# Set the voice VLAN aging time to 30 minutes.
[DeviceA] voice vlan aging 30
# Configure VLAN 2 as a voice VLAN.
[DeviceA] voice vlan 2 enable
# Since GigabitEthernet 1/0/1 may receive both voice traffic and data traffic at the same time, to ensure
the quality of voice packets and effective bandwidth use, configure voice VLANs to work in security
mode, that is, configure the voice VLANs to transmit only voice packets. (Optional. By default, voice
VLANs work in security mode.)
[DeviceA] voice vlan security enable
# Configure the allowed OUI addresses as MAC addresses prefixed by 0011-1100-0000 or
0011-2200-0000. In this way, Device A identifies packets whose MAC addresses match any of the
configured OUI addresses as voice packets.
[DeviceA] voice vlan mac-address 0011-1100-0001 mask ffff-ff00-0000 description IP phone A
[DeviceA] voice vlan mac-address 0011-2200-0001 mask ffff-ff00-0000 description IP phone B
Device A
GE1/0/1
GE1/0/2
IP phone B
010-1002
MAC: 0011-2200-0001
Mask: ffff-ff00-0000
PC B
MAC: 0022-2200-0002
1-11
Device B
Internet
0755-2002
GE1/0/1