This read-only counter reports how many of this port's remTable entries were detected via the switch's forwarding database (learned MAC addresses) rather than through received LLDP messages. Admins use it to see how many neighbor entries on a port come specifically from MAC learning, which matters when hmLLDPIfaceFDBMode is set to macOnly, both, or autoDetect and no LLDP is being received. For example, a port with a nonzero FDB entry count but zero IEEE and Hirma entry counts indicates its neighbors were identified purely from learned MAC addresses rather than any LLDP exchange.