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Message Exchange

The RADIUS server and the router’s RADIUS dynamic-request server exchange messages using User Datagram Protocol (UDP). The Disconnect-Request message sent by the RADIUS server has the same format as the CoA-Request packet that is sent for a change of authorization operation.

The disconnect response is either a Disconnect-ACK or a Disconnect-NAK message:

If AAA successfully disconnects the user, the response is a RADIUS-formatted packet with a Disconnect-ACK message.
If AAA cannot disconnect the user, the request is malformed, or attributes are missing from the request, the response is a RADIUS-formatted packet with a Disconnect-NAK message.

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