This read-only Counter reports how many stations learned via this port actually belong to a different segment than the one physically attached to this port, which only makes sense on trunk-style ports carrying traffic for multiple TrCRFs. A high count here on a port an admin expected to be a simple access port would be a red flag that the port is unexpectedly acting as a trunk or transit path. This complements ciscoTsPortStatsLocalStations to give a full local-versus-remote breakdown of learned stations per port.