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Updated:July 21, 2020
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Voice VLAN is used when traffic from VoIP equipment or phones is assigned to a specific
VLAN. The switch can automatically detect the voice traffic, add port members to the Voice VLAN, and assign the
respective QoS (Quality of Service) parameters to the voice traffic from the Voice VLAN. This article explains
how to configure a Voice VLAN on the Cisco Business 250 or 350 series switch.
Note: The switch default VLAN (VLAN 1, by default) cannot act as the Voice VLAN.
A new VLAN must be created.
Step 1. Log into to the web configuration utility and choose VLAN
Management > Voice VLAN > Properties.
The Properties page opens:
Step 2. In the Voice VLAN ID field, enter a VLAN ID assigned to the Voice VLAN.
Step 3. In the CoS/802.1p drop-down list, choose a Class of Service ID. This ID
tells the Link Layer Discovery Protocol Media Endpoint Discovery protocol (LLDP-MED) which CoS/802.1p network
policy to be used for the voice VLAN.
Step 4. In the DSCP drop-down list, choose a Differentiated Services Code
Point (DSCP) ID number for the LLDP. This value tells LLDP-MED which DSCP to use as a voice network
Step 5. In the Dynamic Voice VLAN Settings area, in the Dynamic Voice VLAN field, click
one of the following radio buttons:
Enable Auto Voice VLAN - Set the dynamic voice VLAN to auto voice VLAN. Auto voice
VLAN works with Auto Smartport. When Auto Smartport is enabled, it adds a port to the voice VLAN if it detects
Enable Telephony OUI - Set the Dynamic Voice VLAN to Telephony OUI (Organization
Unique Identifier). The switch automatically adds the port to the voice VLAN if it receives a packet which
source MAC address matches the one of the telephone OUI.
Disable - Disables Dynamic Voice VLAN.
Note: If you do not choose Enable Auto Voice VLAN, skip to Step 7.
Step 6. In the Auto Voice VLAN Activation, click one of the following radio
Immediate - Activates auto voice VLAN immediately.
By external Voice VLAN trigger - Activates auto voice VLAN only when voice VLAN
devices are present.
Step 7. Click Apply to save changes or Cancel to discard them.
You have now successfully learned the steps to configure a voice VLAN on the Cisco Business 250 or 350 series switch.