3Com SuperStack 4 Configuration Manual page 57

Voice VLAN
Configuration
Voice VLAN Overview
Voice VLAN
Configuration
Voice VLAN is specially designed for users' voice flow, and it distributes different
port precedence in different cases.
The system uses the source MAC of the traffic traveling through the port to
identify the IP Phone data flow. You can either preset an OUI address or adopt the
default OUI address as the standard. Here the OUI address refers to that of a
vendor.
Voice VLAN can be configured either manually or automatically. In auto mode, the
system learns the source MAC address and automatically adds the ports to a Voice
VLAN using the untagged packets sent out when IP Phone is powered on; in
manual mode, however, you need to add ports to a Voice VLAN manually. Both of
the modes forward the tagged packets sent by IP Phone without learning the
address.
Since there are multiple types of IP Phones, you must ensure that the mode on a
port matches the IP Phone. See
Table 58 The corresondance between Port Mode and IP Phone
Voice VLAN Mode Type of IP Phone
Auto mode Tagged IP Phone
Untagged IP Phone
Manual Mode Tagged IP Phone
Untag IP Phone
Untagged IP Phone
The configuration of Voice VLAN is described in the following sections:
Enabling/Disabling Voice VLAN Features
■
Enabling/Disabling Voice VLAN Features on a Port
■
Voice VLAN Configuration
Table 58:
Port Mode
Access: Not supported
Trunk: Supported, but the default VLAN of the
connected port must exist and cannot be the
voice VLAN. The default VLAN is allowed to
pass the connected port.
Hybrid: Suppored, but the default VLAN of the
connected port must exist and it is in the
tagged VLAN list which is allowed to pass the
connected port.
Access, Trunk, and Hybrid: Not supported,
because the default VLAN of the connected
port must be the Voice VLAN, and the
connected port belongs to the Voice VLAN,
that is, user add the port to the Voice VLAN
manually.
Access: Not supported
Trunk: Supported, but the default VLAN of the
connected port must exist and cannot be the
voice VLAN. The default VLAN is allowed to
pass the connected port
Hybrid: Supported, but the default VLAN of
the connected port must exist and it is in the
tagged VLAN list which is allowed to pass the
connected port.
Access: Supported, but the default VLAN of
the connected port must be the Voice VLAN.
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