This read-only counter counts how many EAPOL-Start frames the switch has received from the client for this session, which a supplicant sends to initiate 802.1X authentication. An administrator watches this counter to see whether a client is actively trying to re-initiate authentication, which can indicate repeated connection attempts or a flapping link. For example, a rapidly climbing count here alongside repeated authentication failures suggests the client keeps resending Start frames because earlier attempts aren't completing.