This feature maximizes the use of the remaining healthy RADIUS servers for subscriber authentication and accounting. After the hold-down time expires, a single RADIUS message is used to determine the status of the RADIUS server. If the server remains unresponsive after waiting for a single timeout interval (without any retries), then it is placed back into the hold-down state. If the RADIUS server responds, then it is used for subscriber authentication and accounting with the rest of the healthy servers.