3Com 4210G Series, Configuration Manual, Page: 153 / 1133

8-3
Voice VLAN assignment
mode
Voice traffic
type
Port link type
Access: not supported
Trunk: supported if the default VLAN of the
connecting port exists and is not the voice VLAN and
the connecting port belongs to the default VLAN
Tagged voice
traffic
Hybrid: supported if the default VLAN of the
connecting port exists and is not the voice VLAN, the
traffice of the default VLAN is permitted to pass
through the port, and the traffic of the Voice VLAN is
permitted to pass through the connecting port tagged
Access: supported if the default VLAN of the
connecting port is the voice VLAN
Trunk: supported if the default VLAN of the
connecting port is the voice VLAN and that the voice
VLAN is permitted to pass through the connecting
port
Manual mode
Untagged
voice traffic
Hybrid port: supported if the default VLAN of the
connecting port is the voice VLAN and is permitted to
pass through the connecting port untagged
If an IP phone sends tagged voice traffic and its connecting port is configured with 802.1X
authentication and Guest VLAN, you should assign different VLAN IDs for the voice VLAN, the default
VLAN of the connecting port, and the 802.1X Guest VLAN.
z
The default VLANs for all ports are VLAN 1. You can configure the default VLAN of a port and
configure a port to permit a certain VLAN to pass through with commands. For more information,
refer to
Port-Based VLAN Configuration .
z
Use the
display interface
command to display the default VLAN of a port and the VLANs
permitted to pass through the port.
Security Mode and Normal Mode of Voice VLANs
Voice VLAN-enabled ports can operate in security mode or normal mode based on their inbound
packet filtering mechanisms.
In a safe network, you can configure the voice VLANs to operate in normal mode, thus reducing the
consumption of system resources due to source MAC addresses checking. It is recommended not to
transmit both voice packets and non-voice packets in a voice VLAN. If you have to, please ensure that
the voice VLAN security mode is disabled.