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Table 17 How a voice VLAN-enabled port processes packets in security and normal mode
Voice VLAN
mode
Packet type Packet processing 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 that carry the voice
VLAN tag
Packets that carry 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 determine 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 that carry the voice
VLAN tag
Packets that carry other
tags
Forwarded or dropped depending on whether the port allows
packets of these VLANs to pass through
Configuration prerequisites
Before you configure a voice VLAN, complete the following tasks:
• Create a VLAN.
• Configure QoS priority settings for voice VLAN traffic on an interface before you enable voice
VLAN on the interface.
If the configuration order is reversed, your priority configuration will fail. For more information, see
"Configuring QoS priority settings for voice traffic on a
n interface."
• Configure the voice VLAN assignment mode.
For more information, see "Configuring a port to operate in automatic voice VLAN assignment
mode" and "Configuring a port to operate in manual voice VLAN assignment mode."
Configuring QoS priority settings for voice traffic on an
interface
In voice VLAN applications, you can improve the quality of voice traffic by configuring the appropriate
QoS priority settings, including the Class of Service (CoS) and Differentiated Services Code Point (DSCP)
values, for voice traffic. Voice traffic carries its own QoS priority settings. You can configure the device
either to modify or not to modify the QoS priority settings carried by incoming voice traffic.
Configuration restrictions and guidelines
Configure the QoS priority settings for voice traffic on an interface before you enable voice VLAN on the
interface. If the configuration order is reversed, your priority trust setting will fail.
Configuration procedure
To configure QoS priority settings for voice traffic:
Ste
Command
Remarks
1. Enter system view.
system-view N/A
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