This read-only counter tracks how many times the switch has sent an initial RADIUS Access-Request packet to the authentication server for this session, indicating attempted communication with the backend server. An administrator uses this as a baseline check that the switch is actually reaching out to RADIUS at all for a given client. For example, if this counter stays at zero despite a client attempting to authenticate, the admin would suspect a problem before the RADIUS request is even sent, such as a misconfigured RADIUS server address.