H3C S5120-SI Series Command Reference Manual page 164

Default Level
2: System level
Parameters
None
Description
Use the voice vlan security enable command to enable voice VLAN security mode.
Use the undo voice vlan security enable command to disable voice VLAN security mode.
After you enable the security mode for a voice VLAN, only voice traffic can be transmitted in the voice
VLAN. The device matches the source MAC addresses of the packets against the supported OUI
addresses to determine whether they are voice traffic and filters all non-voice traffic, guaranteeing high
priority and high quality for voice traffic. On the other hand, when a voice VLAN operates in common
mode, other service traffic is also allow to be transmitted in the voice VLAN.
By default, voice VLAN security mode is not enabled.
Examples
# Disable voice VLAN security mode.
<Sysname> system-view
[Sysname] undo voice vlan security enable
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