Enabling LLDP for automatic IP phone discovery

The device can automatically discover the peer through LLDP, and exchange LLDP TLVs with the peer. If the LLDP System Capabilities TLV received on a port indicates that the peer can act as a telephone, the device sends an LLDP TLV with the voice VLAN configuration to the peer.

When the IP phone discovery process is complete, the port will continue the following voice VLAN configuration:

• Join the voice VLAN.

• Increase the transmission priority of the voice traffic sent from the IP phone.

To ensure that the IP phone can pass authentication, the device will add the MAC address of the IP phone to the MAC address table.