Configuration prerequisites

Before you enable the 802.1X critical voice VLAN on a port, complete the following tasks:

• Enable LLDP both globally and on the port.

  The device uses LLDP to identify voice users. For information about LLDP, see Layer 2—LAN Switching Configuration Guide.

• Enable voice VLAN on the port.

  For information about voice VLANs, see Layer 2—LAN Switching Configuration Guide.