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Webcast-Catalyst9k
New Member

Voice VLAN

Hi

Just wanted to know how do i set up a Separate VLAN for Voice, This should be a Dynamic VLAN, i also have existin Data VLANS, SO was wondering what happens when i plug in any Voice Device i.e IP Phone..how does it detect which VLAN to communicate with...if i go for a Dynamic VLAN.??

Pls help !!

1 REPLY
Cisco Employee

Re: Voice VLAN

A voice vlan acts as a "dynamic VLAN", but it is not the same as VMPS's "dynamic VLAN." A voice vlan is configured in conjuction with a data (access) VLAN. When an IP phone boots up it sends a CDP trigger message to the switch. The switch responds immediately with a CDP that contains information about the Aux VLAN configuration. This is how the IP Phone knows what VLAN-ID to use in tagging frames sent to the switch.

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