Figure 2-5 Voice VLANs
The voice VLAN feature places the phones into their own VLANs without any end-user
intervention. The user simply plugs the phone into the switch, and the switch provides the
phone with the necessary VLAN information.
Using voice VLANs offers several advantages. Network administrators can seamlessly
maintain these VLAN assignments, even if the phones move to new locations. By placing
phones into their own VLANs, network administrators gain the advantages of network
segmentation and control. Voice VLANs also allow administrators to preserve their existing
IP topology for the data end stations and easily assign IP phones to different IP subnets
using standards-based DHCP operation.
In addition, with the phones in their own IP subnets and VLANs, network administrators
can more easily identify and troubleshoot network problems and create and enforce QoS or
security policies.
Building
Distribution
Switches
VLAN=11
IP
VLAN=10 VLAN=32
IP
VLAN=31
IP
VLAN=30
IP IP
VVID=110 VVID=111 VVID=312 VVID=311 VVID=310
Implementing VLANs and Trunks 23
With the voice VLAN feature, network administrators have all the advantages of the
physical infrastructure convergence, while maintaining separate logical topologies for
voice and data terminals.
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