Auto Voice VLAN Configuration
83
Auto Voice VLAN Configuration
The voice VLAN feature enables switch ports to carry voice traffic with defined settings so that voice
and data traffic are separated when coming onto the port. A voice VLAN ensures that the sound quality
of an IP phone is safeguarded from deterioration when data traffic on the port is high.
The inherent isolation provided by VLANs ensures that inter-VLAN traffic is under management control
and that network-attached clients cannot initiate a direct attack on voice components. A QoS protocol
based on the IEEE 802.1P class-of-service (CoS) protocol uses classification and scheduling to send
network traffic from the switch in a predictable manner. The system uses the source MAC of the traffic
traveling through the port to identify the IP phone data flow.
Voice VLAN is enabled per-port basis. A port can participate only in one voice VLAN at a time. The
Voice VLAN feature is disabled by default.
Use the Auto Voice VLAN Configuration page to configure the global administrative mode of the Voice
VLAN feature as well as the per-port settings. When Voice VLAN is configured on a port that receives
both voice and data traffic, it can help ensure that the voice traffic has priority.
To display the Auto Voice VLAN Configuration page, click
Switching
>
Auto Voice VLAN
in the navi-
gation pane.
Figure 56. Auto Voice VLAN Configuration Page
Table 37. Auto Voice VLAN Configuration Fields
Field
Description
Voice VLAN Admin Mode
Click
Enable
or
Disable
to administratively turn the Voice VLAN feature on or off for all ports.
The administrative mode of the Voice VLAN feature. When Voice VLAN is enabled globally
and configured on interfaces that carry voice traffic, this feature can help ensure that the
sound quality of an IP phone does not deteriorate when data traffic on the port is high.
Interface
The interface associated with the rest of the data in the row. When adding a Voice VLAN
configuration to a port, the Interface menu allows you to select the port to configure. Only
interfaces that have not been configured with Voice VLAN settings can be selected from the
menu.
Operational State
The operational status of the Voice VLAN feature on the interface. To be enabled, Voice VLAN
must be globally enabled and enabled on the interface. Additionally, the interface must be up
and have a link.