H3C S7500E Series Ethernet Switches Operation Manual

Operation Manual – VLAN
H3C S7500E Series Ethernet Switches Chapter 3 Voice VLAN Configuration
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 Note:
z As the first 24 bits of a MAC address (in binary format), an OUI address is a globally
unique identifier assigned to a vendor by IEEE (Institute of Electrical and Electronics
Engineers).
z The default OUI address can be configured/removed manually.
3.1.1 Working Modes of Voice VLAN
A voice VLAN can operate in two working modes: automatic mode and manual mode
(the mode here refers to the way of adding a port to a voice VLAN).
z 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 to ensure 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 deleting of ports are automatically realized
by the system.
z In manual mode, the IP phone access port needs to be added 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 the voice VLAN and removing ports from the voice VLAN are
carried out by the administrators.
z Both modes forward tagged packets according to their tags.
The following table lists the co-relation between the working modes of a voice VLAN,
the voice traffic type of an IP phone, and the interface modes of a VLAN interface.