DELL N3000 Manual Do Utilizador

Configuring VLANs

The Voice VLAN feature enables switch ports to carry voice traffic with 

defined priority. When multiple devices, such as a PC and an IP phone, are 

connected to the same port, you can configure the port to use one VLAN for 

voice traffic and another VLAN for data traffic.
Voice over IP (VoIP) traffic is inherently time-sensitive: for a network to 

provide acceptable service, the transmission rate is vital. The priority level 

enables the separation of voice and data traffic coming onto the port. 
A primary benefit of using Voice VLAN is to ensure that the sound quality of 

an IP phone is safeguarded from deteriorating when the data traffic on the 

port is high. The switch uses the source MAC address of the traffic traveling 

through the port to identify the IP phone data flow.
The Voice VLAN feature can be enabled on a per-port basis. This feature 

supports a configurable voice VLAN DSCP value. This value is later retrieved 

by LLDP when the LLDPDU is transmitted, if LLDP has been enabled on 

the port and the required TLV is configured for the port.