HP V1910 Switch Series - Configuration Task List; Configuring the Voice VLAN

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 Normal mode: In this mode, voice VLAN-enabled ports receive packets carrying the voice VLAN
tag and forward packets in the voice VLAN without checking their source MAC addresses against
the OUI addresses configured for the device. If the PVID of the port is the voice VLAN and the port
works in manual VLAN assignment mode, the port forwards all received untagged packets in the
voice VLAN. In normal mode, the voice VLANs are vulnerable to traffic attacks. Vicious users may
forge a large amount of voice packets and send them to the device to consume the voice VLAN
bandwidth, affecting normal voice communication.
 Security mode: In this mode, only voice packets whose source MAC addresses match the
recognizable OUI addresses can pass through the voice VLAN-enabled inbound port, but all other
packets are dropped.
In a safe network, you can configure the voice VLANs to operate in normal mode, reducing the
consumption of system resources due to source MAC addresses checking.
HP does not recommend you transmit both voice traffic and non-voice traffic in a voice VLAN. If you have
to, ensure that the voice VLAN security mode is disabled.
Table 60 How a voice VLAN-enable port processes packets in security/normal mode
Voice VLAN mode Packet t
yp
e
Packet
p
rocessin
g
mode
Security mode
Untagged packets
If the source MAC address of a packet matches an
OUI address configured for the device, it is
forwarded in the voice VLAN; otherwise, it is
dropped.
Packets carrying the voice
VLAN tag
Packets carrying other tags
Forwarded or dropped depending on whether the
port allows packets of these VLANs to pass through
Normal mode
Untagged packets
The port does not check the source MAC addresses
of inbound packets. In this way, both voice traffic
and non-voice traffic can be transmitted in the voice
VLAN.
Packets carrying the voice
VLAN tag
Packets carrying other tags
Forwarded or dropped depending on whether the
port allows packets of these VLANs to pass through
Configuring the voice VLAN
Configuration task list
Before configuring the voice VLAN feature, you must create the corresponding VLAN and configure the
link type of each port to be assigned to the VLAN. VLAN 1 is the default VLAN, and you cannot create
it or configure it as a voice VLAN. For more information about port link types, see the chapter “Port
management configuration.”
Configuring voice VLAN on a port in automatic voice VLAN assignment mode
Perform the tasks described in Table 61 to configure the voice VLAN function on a port working in
automatic voice VLAN assignment mode.