H3C Technologies H3C WX6000 Series Access Controllers - Manual (Page 70)

8-2
Voice VLAN Modes on a Port
There are two voice VLAN modes on a port: automatic and manual (the mode here refers to the way of
adding a port to a voice VLAN).
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In automatic mode, the system identifies the source MAC address contained in the protocol
packets (untagged packets) sent when the IP phone is powered on and matches it against the OUI
addresses. If a match is found, the system will automatically add the port into the Voice VLAN and
apply ACL rules and configure the packet precedence. An aging time can be configured for the
voice VLAN. The system will remove a port from the voice VLAN if no voice packet is received from
it after the aging time. The adding and removing of ports are automatically realized by the system.
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In manual mode, administrators add the IP phone access port to the voice VLAN manually. It then
identifies the source MAC address contained in the packet, matches it against the OUI addresses.
If a match is found, the system issues ACL rules and configures the precedence for the packets. In
this mode, the operation of adding ports to and removing ports from the voice VLAN are carried out
by the administrators.
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Both modes forward tagged packets according to their tags.
The following table lists the co-relation between the port voice VLAN mode, the voice traffic type of an IP
phone, and the port link type.
Table 8-2 Voice VLAN operating mode and the corresponding voice traffic types
Port voice VLAN
mode
Voice traffic type Port link type
Access: not supported
Trunk: supported provided that the default VLAN of the access port
exists and is not the voice VLAN and that the access port belongs to
the voice VLAN
Tagged voice traffic
Hybrid: supported provided that the default VLAN of the access port
exists and is not the voice VLAN, and is in the list of tagged VLANs
whose packets can pass through the access port
Automatic mode
Untagged voice
traffic
Access, Trunk, Hybrid: not supported
Access: not supported
Trunk: supported provided that the default VLAN of the access port
exists and is not the voice VLAN and that the access port belongs to
the default VLAN
Tagged voice traffic
Hybrid: supported provided that the default VLAN of the access port
exists and is not the voice VLAN, and is in the list of tagged VLANs
whose packets can pass through the access port
Access: supported provided that the default VLAN of the access
port is the voice VLAN
Trunk: supported provided that the default VLAN of the access port
is the voice VLAN and that the access port allows packets from the
voice VLAN to pass through
Manual mode
Untagged voice
traffic
Hybrid port: supported provided that the default VLAN of the access
port is the voice VLAN and is in the list of untagged VLANs whose
packets are allowed to pass through the access port