Ensuring that RADIUS clears existing session state before performing authentication and accounting for new sessions

At subscriber session startup, the Junos OS authd process sends an Acct-On message to RADIUS servers. In some service provider environments, upon receipt of the Acct-On message, the RADIUS server cleans up the previous session state and removes accounting statistics. However, authentication or accounting for the new session can start before the RADIUS cleanup of the previous session-this can result in RADIUS deleting the new session's authentication and accounting information (which might include billing information). To ensure that the new session's authentication and accounting information is not deleted, you can optionally configure authd to wait for an Acct-On-Ack response message from RADIUS before sending the new authentication and accounting updates to the RADIUS server. When this feature is enabled, all authentication requests fail until the router receives the Acct-On-Ack response from at least one configured RADIUS server.