Use this procedure to display the RADIUS server reachability settings.
show radius reachability
Display the RADIUS server reachability settings.
Switch:1#show radius reachability
        EAP RADIUS reachability mode   : use-radius
        EAP RADIUS reachability status : RADIUS is disabled globally
        EAP RADIUS reachable server    : none
        Time until next check          : N/A
        RADIUS username                : reachme
        RADIUS password                : reachme
        RADIUS keep-alive-timer        : 180
        RADIUS unreachable-timer       : 60