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VOICE VLAN CONFIGURATION GUIDE
Configuring Voice
VLAN
In automatic mode, the switch configured with voice VLAN checks the source
MAC address of each incoming packet against the voice device vendor OUI. If a
match is found, the switch assigns the receiving port to the voice VLAN and tags
the packet with the voice VLAN ID automatically.
When the port joins the voice VLAN, a voice VLAN aging timer starts. If no voice
packets have been received before the timer expires, the port leaves the voice
VLAN.
In manual mode, you need to manually assign a port to or remove the port from
the voice VLAN.
Network Diagram
Figure 7 Network diagram for voice VLAN in automatic mode
Networking and
Configuration
Requirements
As shown in Figure 7, PC is connected to Ethernet 1/0/1 of Switch A through IP
phone 1, and IP phone 2 is connected to Ethernet 1/0/2 of Switch A. IP phone 1
sends out voice traffic with the tag of the voice VLAN, while IP phone 2 sends out
voice traffic without any VLAN tag. Configure voice VLAN to satisfy the following
requirements:
■ VLAN 2 functions as the voice VLAN for transmitting voice traffic, and set the
aging time of the voice VLAN to 100 minutes. VLAN 6 transmits user service
data.
■ Ethernet 1/0/1 and Ethernet 1/0/2 can recognize voice traffic automatically.
Service data from PC and voice traffic are assigned to different VLANs and then
transmitted to the server and the voice gateway respectively through Switch B.
VoIP Network
PC
IP Phone1
(Tag)
000f-e234-1234
SwitchA SwitchB
Voice
Gateway
Server
IP Phone2
(Untag)
Eth1/0/1
Eth1/0/2
Oui:000f-2200-0000