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-ff00-0000description private[4500]voice vlan 2 enable[4500]voice vlan aging 100Configuring VoiceVLAN with a PCDownstream fromPhoneA common configuration for voice enabled networks is to place a PC downstreamfrom a VoIP phone. In this configuration, the phone is usually with tagged trafficresiding on a Voice VLAN, and the PC is untagged on the default VLAN for theswitch port.Figure 17 Voice VLAN/PC ConfigurationKey Details for ProperSetup■ The Voice VLAN must be set and enabled, both globally for the switch and atthe system view level.■ Each port where a VoIP phone may be connected must have Voice VLANenabled locally■ Each port where Voice VLAN is enabled must be configured as trunk or hybrid,not access type■ The default VLAN PVID for all ports is 1. This is where the PC data traffic willgo by default. This can be changed if necessary.■ 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 availablefor both the phone and the PC. This can either be via two DHCP servers, oneon the Voice VLAN and one on the data VLAN, or by enabling DHCP Relayacross both VLANs.■ If no DHCP server is used, then the phones must be manually configured to usethe voice VLAN
