Radius and port 77

Hello, i'm using radius authentication (freeradius) on alcatel switchs and i can see in freeradius logs this kind of message : Login OK: [XXXXXXXXXXXX/XXXXXXXXXXXX] (from client Switch port 77 cli XXXXXXXXXXXX) Does someone could explain me what means "port 77" As much I understand this notation : Login OK: [XXXXXXXXXXXX/XXXXXXXXXXXX] (from client Switch port 1021) As much i cant understand "port 77" Thanks for your help Pascal