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User Guide V
2
IU 4300T Converged Network Appliance
3 - 14
3. Press Submit.
Configuring VLANs in the 4300T
As depicted in the diagram below, VLANs are used to connect the 4300T to an
Ethernet switch that has been configured to use VLANs.
Typically, all VoIP devices are placed in the same VLAN while data devices
are placed in a different VLAN. This is to ensure priority treatment of the VoIP
traffic on the LAN. Note that the 4300T does not require VLANs to prioritize
VoIP traffic; prioritization is determined by the VOS Application Layer
Gateway, regardless of VLAN. Some important notes about VLANs:
• A physical LAN port will operate in either 802.1 or 802.1q mode, not both
simultaneously
• The 4300T supports up to 16 VLANs
• A unique IP Subnet is assigned to each VLAN
• You can associate one or more VLANs to each LAN port operating in
802.1q mode
• Traffic within a VLAN is switched among all ports with membership
• Traffic between VLANs is routed by the 4300T
• The 4300T ALG can only be assigned to one VLAN id
— Only ALG traffic is prioritized over the WAN
— Other non-VoIP traffic in the same VLAN will not receive priority
treatment
• A DHCP server can be enabled/disabled per VLAN
• Cisco Discovery Protocol is not supported
802.1
4300T
VLANid 1/2
VLANid 1/3 VLANid 1/2/3
VLAN
Switch
(VLANid 16)
WAN
VLANid 1/2/3
P1
P2
P3
P4
EM006