What is a voice VLAN?
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 Cisco Auto Voice VLAN?
Auto Voice VLAN is responsible to maintain the voice VLAN, but depends on Auto Smartport to maintain the voice VLAN port memberships. Auto Voice VLAN performs the following functions when it is in operation: • It discovers voice VLAN information in CDP advertisements from directly connected neighbor devices.
How do you make a voice VLAN?
1. How to Configure Voice VLAN?
- Create a VLAN on the switch and add interfaces to the VLAN to implement Layer 2 interworking.
- Configure the OUI to match the source MAC address of the received packet.
- Configure the voice VLAN function on the interface.
Is voice VLAN tagged or untagged?
The voice traffic is an 802.1q-tagged packet with a VLAN ID (that might or might not be 0) and an 802.1p (3-bit layer 2 COS) with a specific value (typically 5 is assigned for voice traffic). Data traffic is always untagged.
What is the difference between 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.
What is dynamic voice VLAN?
VSDP is a Cisco defined protocol for voice service discovery. Unlike Telephony OUI mode that detects voice devices based on telephony OUI, Auto Voice VLAN mode depends on Auto Smartport to dynamically add the ports to the voice VLAN.
What is the purpose of Lldp?
LLDP is a neighbor discovery protocol that is used for network devices to advertise information about themselves to other devices on the network. This protocol runs over the data-link layer, which allows two systems running different network layer protocols to learn about each other.
How do I enable voice VLAN on a Cisco switch?
- Switch# configure terminal.
- Switch(config)# interface.
- Switch(config-if)# trust-device.
- • vlan-id—Configures the phone to forward. all voice traffic through the specified.
- Switch(config-if)# end.
- • show interfaces interface-id switchport.
- Switch# copy running-config.
- Switch> enable.
How does voice VLAN work Cisco?
What devices use LLDP?
LLDP-MED enables network discovery between network connectivity devices and media endpoints such as, softphones, IP telephones, VOIP gateways and conference bridges.