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Quidway S1700 Series Ethernet Switches
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8.4 Configuring Voice VLAN

When IP telephony is deployed in an enterprise network, it is recommended to isolate the
Voice over IP (VoIP) network traffic from other data traffic. Traffic isolation can provide
higher voice quality by preventing excessive packet delays, packet loss, and jitter. This is best
achieved by assigning all VoIP traffic to a single Voice VLAN.
The use of a Voice VLAN has several advantages. It provides security by isolating the VoIP
traffic from other data traffic. End-to-end QoS policies and high priority can be applied to
VoIP VLAN traffic across the network, guaranteeing the bandwidth it needs. VLAN isolation
also protects against disruptive broadcast and multicast traffic that can seriously affect voice
quality.
The switch allows you to specify a Voice VLAN for the network and set a CoS priority for the
VoIP traffic. The VoIP traffic can be detected on switch ports by using the source MAC
address of packets. When VoIP traffic is detected on a configured port, the switch
automatically assigns the port as a tagged member the Voice VLAN. Alternatively, switch
ports can be manually configured.

8.4.1 Configuring Voice VLAN

Use the Traffic > Voice VLAN (Configure Global) page to configure the switch for VoIP
traffic. First enable automatic detection of VoIP devices attached to the switch ports, then set
the Voice VLAN ID for the network. The Voice VLAN aging time can also be set to remove a
port from the Voice VLAN when VoIP traffic is no longer received on the port.
To configure global settings for a Voice VLAN:
1. Click Traffic, Voice VLAN.
2. Select Configure Global from the Step list.
3. Enable Auto Detection Status.
4. Specify the Voice VLAN ID.
5. Adjust the Voice VLAN Aging Time if required.
6. Click Apply.
Figure 8-14 Configuring a Voice VLAN
Issue 01 (2011-11-17)

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