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Dell PowerEdge FN I/O Module Configuration Guide 9.10(0.0)

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The Port-Authentication Process

The authentication process begins when the authenticator senses that a link status has changed from down to up:

  1. When the authenticator senses a link state change, it requests that the supplicant identify itself using an EAP Identity Request frame.
  2. The supplicant responds with its identity in an EAP Response Identity frame.
  3. The authenticator decapsulates the EAP response from the EAPOL frame, encapsulates it in a RADIUS Access-Request frame and forwards the frame to the authentication server.
  4. The authentication server replies with an Access-Challenge frame. The Access-Challenge frame requests that the supplicant prove that it is who it claims to be, using a specified method (an EAP-Method). The challenge is translated and forwarded to the supplicant by the authenticator.
  5. The supplicant can negotiate the authentication method, but if it is acceptable, the supplicant provides the Requested Challenge information in an EAP response, which is translated and forwarded to the authentication server as another Access-Request frame.
  6. If the identity information provided by the supplicant is valid, the authentication server sends an Access-Accept frame in which network privileges are specified. The authenticator changes the port state to authorized and forwards an EAP Success frame. If the identity information is invalid, the server sends an Access-Reject frame. If the port state remains unauthorized, the authenticator forwards an EAP Failure frame.
    Figure 1. EAP Port-AuthenticationIllustration of an EAP port-authentication process.

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