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Configuring a port to operate in automatic voice VLAN
assignment mode
Configuration restrictions and guidelines
When you configure a port to operate in automatic voice VLAN assignment mode, follow these
restrictions and guidelines:
• Do not configure a VLAN as both a voice VLAN and a protocol-based VLAN. A voice VLAN in
automatic mode on a hybrid port processes only tagged incoming voice traffic. A protocol-based
VLAN on a hybrid port processes only untagged incoming packets. For more information about
protocol-based VLANs, see "Configuring protocol-based VLANs."
• As a best practice, do not use the automatic voice VLAN assignment mode together with MSTP.
In MSTP mode, if a port is blocked in the MSTI of the target voice VLAN, the port drops the
received packets instead of delivering them to the CPU. As a result, the receiving port will not
be dynamically assigned to the voice VLAN.
• As a best practice, do not use the automatic voice VLAN assignment mode together with PVST.
In PVST mode, if the target voice VLAN is not permitted on a port, the port is placed in blocked
state. The received packets are dropped instead of being delivered to the CPU. As a result, the
receiving port will not be dynamically assigned to the voice VLAN.
• As a best practice, do not configure both dynamic MAC-based VLAN assignment and automatic
voice VLAN assignment mode on a port. If you have to configure both of them on a port,
configure dynamic MAC-based VLAN assignment first. If you configure them in a reverse order,
conflict will occur. When you remove one of the configurations, the operation of the other is
affected.
Configuration procedure
To configure a port to operate in automatic voice VLAN assignment mode:
Step Command Remarks
1. Enter system view.
system-view
N/A
2. (Optional.) Set the voice
VLAN aging timer.
voice-vlan aging
minutes
By default, the aging timer of a
voice VLAN is 1440 minutes.
The voice VLAN aging timer takes
effect only on ports in automatic
voice VLAN assignment mode.
3. (Optional.) Enable the voice
VLAN security mode.
voice-vlan security enable
By default, the voice VLAN
security mode is enabled.
4. (Optional.) Add an OUI
address for voice packet
identification.
voice-vlan mac-address
oui
mask
oui-mask
[
description
text
]
By default, system default OUI
addresses exist. For more
information, see Table 10.
5. Enter Layer 2 Ethernet
interface view.
interface
interface-type
interface-number
N/A
6. Configure the link type of the
port.
• port link-type trunk
• port link-type hybrid
N/A
7. (Optional.) Configure the port
to operate in automatic voice
VLAN assignment mode.
voice-vlan mode auto
By default, the automatic voice
VLAN assignment mode is
enabled.
8. Enable the voice VLAN
feature on the port.
voice-vlan
vlan-id
enable
By default, the voice VLAN
feature is disabled.
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