Polycom 4300T Benutzerhandbuch

User Guide V

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IU 4300T Converged Network Appliance

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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

VLANid 1/2

VLANid 1/3

VLANid 1/2/3

VLAN

Switch

(VLANid 16)

WAN

VLANid 1/2/3

P1
P2
P3
P4

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