802.1X-Related Protocols; Packet Format - HP 5120 EI Switch Series Configuration Manual

Figure 24 Authorization state of a controlled port
Authenticator system 1
Controlled port
Port unauthorized
In the unauthorized state, a controlled port controls traffic in one of the following ways:
Performs bidirectional traffic control to deny traffic to and from the client.

Performs unidirectional traffic control to deny traffic from the client.

NOTE:
The HP switches support only unidirectional traffic control.

802.1X-related protocols

802.1X uses the Extensible Authentication Protocol (EAP) to transport authentication information for the
client, the network access device, and the authentication server. EAP is an authentication framework that
uses the client/server model. It supports a variety of authentication methods, including MD5-Challenge,
EAP-Transport Layer Security (EAP-TLS), and Protected EAP (PEAP).
802.1X defines EAP over LAN (EAPOL) for passing EAP packets between the client and the network
access device over a wired or wireless LAN. Between the network access device and the authentication
server, 802.1X delivers authentication information in one of the following methods:
 Encapsulates EAP packets in RADIUS by using EAP over RADIUS (EAPOR), as described in
relay.‖
Extracts authentication information from the EAP packets and encapsulates the information in

standard RADIUS packets, as described in

Packet format

EAP packet format
Figure 25 shows the EAP packet format.
Uncontrolled port
LAN
Authenticator system 2
Controlled port Uncontrolled port
Port authorized
LAN
―EAP termination.‖
64
―EAP