How to enable the Voice VLAN feature on Dell EMC Networking N-series switches

Summary: The Voice VLAN feature on Dell EMC Networking N-series switches is used to implement traffic prioritization for time-sensitive Voice over IP (VoIP) traffic. This feature allows N-series switches to identify and separate VoIP traffic from data traffic on a per-port basis, and enables the administrator to set the Differentiated Services Code Point (DSCP) or 802.1p priority value for VoIP traffic received on those ports. ...

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Instructions

Feature Description

The Voice VLAN feature can only be configured on general mode interfaces in OS versions below 6.5.1.x. In the 6.5.1.x release and above, using access mode interfaces was added as an option.  A single voice device can authenticate into the Voice VLAN when the port is configured in access mode.  The Voice VLAN feature is not supported on trunk mode ports when connecting to a voice device on any version, but trunk mode ports can pass Voice VLAN traffic to another switch.

 

By default, the Voice VLAN feature is disabled globally, and must be enabled and configured on each interface before prioritization of VoIP traffic can take place.

 

HOW12385_en_US__1icon The Voice VLAN feature is incompatible with the interface Auto-VoIP feature. By default, the Auto-VoIP feature is disabled on all interfaces. Verify that the interface Auto-VoIP feature is disabled using the command show switchport voice, before enabling Voice VLAN.

 
 

Enable Voice VLAN (for firmware versions below 6.5.1.x) 

1.  Enable the voice VLAN feature globally.

Dell# configure 
Dell(config)# voice vlan
 

2.  Configure interface for general mode with untagged data traffic and tagged VoIP traffic VLANs. In the sample configuration below, VLAN 5 is untagged for data traffic, and VLAN 10 is tagged for VoIP traffic.

Dell(config)# interface GigabitEthernet 1/0/1
Dell(config-if)# switchport mode general
Dell(config-if)# switchport general pvid 5
Dell(config-if)# switchport general allowed vlan add 5 untagged
Dell(config-if)# switchport general allowed vlan add 10 tagged
 

3.  Set voice VLAN prioritization for the VoIP traffic VLAN.

Dell(config-if)# voice vlan 10

 

Enable Voice VLAN (for firmware versions 6.5.1.x and above)

1. Enable the voice VLAN feature globally.

Dell# configure 
Dell(config)# switchport voice vlan


2. Configure interface for either general mode with untagged data traffic and tagged VoIP traffic VLANs, or access mode with untagged data traffic VLAN. In the sample configurations below, VLAN 5 is untagged for data traffic, and VLAN 10 is tagged for VoIP traffic.

General Mode Switchport Configuration:
Dell(config)# interface gigabitethernet 1/0/1
Dell(config-if)# switchport mode general
Dell(config-if)# switchport general pvid 5
Dell(config-if)# switchport general allowed vlan add 5 untagged
Dell(config-if)# switchport general allowed vlan add 10 tagged
 

Access Mode Switchport Configuration:
Dell(config)# interface gigabitethernet 1/0/1
Dell(config-if)# switchport mode access
Dell(config-if)# switchport access vlan 5


3. Set voice VLAN prioritization for the VoIP traffic VLAN.

Dell(config-if)# switchport voice vlan 10


 

Additional Voice VLAN Commands

Check global voice VLAN feature status with the command show voice vlan.
 
Dell# show voice vlan

Administrative Mode............... Enable

Check voice VLAN feature status on an interface with the command show voice vlan interface.
 
Dell# show voice vlan interface gigabitethernet 1/0/1

Interface...................................... Gi1/0/1
Voice VLAN Interface Mode...................... Enabled
Voice VLAN COS Override........................ False
Voice VLAN DSCP Value.......................... 46
Voice VLAN Port Status......................... Disabled
Voice VLAN Authentication...................... Enabled



Additional Commands


View the status of the Auto-VoIP feature on all interfaces with the command show switchport voice.

Dell# show switchport voice

Interface  Auto VoIP Mode Traffic Class
---------  -------------- ------------------
Gi1/0/1    Disabled       6
Gi1/0/2    Disabled       6
Gi1/0/3    Disabled       6
(output truncated)

Disable the Auto-VoIP feature on an interface by using the interface command no switchport voice detect auto.

Affected Products

PowerSwitch N1100-ON Series, PowerSwitch N1500 Series, PowerSwitch N2000 Series, PowerSwitch N2100 Series, PowerSwitch N3000 Series, Dell EMC PowerSwitch N3100 Series, PowerSwitch N4000 Series
Article Properties
Article Number: 000120400
Article Type: How To
Last Modified: 05 Jun 2025
Version:  7
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