The Chassis ID field shall contain the same value for all transmitted LLDPDUs independent from the transmitting port of the UAFX Station, i.e., be a non-volatile, UAFX Station-unique identifier.

The Chassis ID subtype field should contain subtype 4, indicating that the Chassis ID field contains a MAC address to achieve the Chassis ID's desired deployment-wide uniqueness. For UAFX Stations with multiple unique MAC addresses, any one of the UAFX Station’s MAC addresses may be used and shall be the same for all external ports of that UAFX Station.