Configuring Voice VLAN with a PC Downstream from Phone 65
[4500 -Ethernet1/0/2]quit
[4500]undo voice vlan mode auto
[4500]voice vlan mac_address 0011-2200-0000 mask ffff-ff00-0000
description private
[4500]voice vlan 2 enable
[4500]voice vlan aging 100
Configuring Voice
VLAN with a PC
Downstream from
Phone
A common configuration for voice enabled networks is to place a PC downstream
from a VoIP phone. In this configuration, the phone is usually with tagged traffic
residing on a Voice VLAN, and the PC is untagged on the default VLAN for the
switch port.
Figure 17 Voice VLAN/PC Configuration
Key Details for Proper
Setup
â– The Voice VLAN must be set and enabled, both globally for the switch and at
the system view level.
â– Each port where a VoIP phone may be connected must have Voice VLAN
enabled locally
â– Each port where Voice VLAN is enabled must be configured as trunk or hybrid,
not access type
â– The default VLAN PVID for all ports is 1. This is where the PC data traffic will
go by default. This can be changed if necessary.
â– For the phone to be automatically configured with the VLAN for voice traffic,
there must be a DHCP server that is capable of supporting Option 184 available
for both the phone and the PC. This can either be via two DHCP servers, one
on the Voice VLAN and one on the data VLAN, or by enabling DHCP Relay
across both VLANs.
â– If no DHCP server is used, then the phones must be manually configured to use
the voice VLAN
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