This object controls how the device populates the standard LLDP-MIB's remote systems table for this port: purely from received LLDP messages, purely from MAC addresses learned in the switch's forwarding database, from both sources combined, or automatically choosing between LLDP and MAC-based detection. Administrators tune this based on whether directly connected neighbors actually speak LLDP, since non-LLDP-capable neighbors would only be discoverable via learned MAC addresses. For example, setting this to autoDetect(4) lets the port fall back to MAC-based neighbor detection automatically whenever no LLDP messages are being received from that link.