The first stage of establishing FA connectivity is element discovery.
On an FA Server, FA is enabled globally by default. However, you must explicitly enable FA on a desired port or MLT interface. After FA is enabled, the FA Server begins transmitting LLDP PDUs that contain the element discovery TLVs. This information is received by FA Client and FA Proxy devices which in turn also transmit their FA capabilities and settings. After the element handshake completes, the FA Server receives I-SID-to-VLAN assignment mappings from the connected client or proxy devices.
An FA Server can communicate with multiple different FA Client and FA Proxy devices.