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What does voice VLAN do?
The voice VLAN feature enables access ports to carry IP voice traffic from an IP phone. When the switch is connected to a Cisco 7960 IP Phone, the phone sends voice traffic with Layer 3 IP precedence and Layer 2 class of service (CoS) values, which are both set to 5 by default.
What is voice VLAN and data VLAN?
The LAN used for voice traffic from the IP phone is called the voice VLAN and the VLAN used for data is called the data or access VLAN. The data or access VLAN is configured just as a regular access VLAN is configured using the switchport access vlan vlan-id command.
Do you need a native VLAN?
In order to configure native VLAN, switch port trunk native VLAN command is used. Native VLANs are recognized if they are not tagged to any trunks. It is not necessary to have native VLAN on the trunk.
Is the voice vlan the same as the data VLAN?
The Voice VLAN is also known as the Auxiliary VLAN (AUX VLAN) The computer will be in a data VLAN, the IP phone will be in the voice VLAN. It will look like this: Behind the scenes, we have a trunk between our switch and IP phone.
How does the IP phone know which VLANs to use?
We configure the interface in access mode and use VLAN 100 for the computer. The switchport voice vlan command tells the switch to use VLAN 101 as the voice VLAN. We configured the switch but how does the IP phone know which VLANs to use? Cisco IP phones use CDP (Cisco Discovery Protocol) for this.
When do I need a voice vlan switch?
In these places, offices are widely distributed and the staff is scattered, increasing the need for IP phones to maintain frequent multi-party communication. When there is no need to connect a PC for data services, voice VLAN is typically used in conference rooms. 3. Network Switches That Support Voice VLAN
Can a VoIP phone send a VLAN tag?
VOIP phones have the capacity to send and understand 802.1q VLAN tags, and can therefore be configured to send a VLAN tag for all the Voice traffic. PC’s, as we’ve already discussed, only send untagged traffic.