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This process continues until the maximum number of request attempts set by using the dot1x retry
command is reached.
The username request timeout timer sets both the identity request interval for the multicast trigger and the
identity request timeout interval for the unicast trigger.
802.1X authentication procedures
802.1X authentication has two methods: EAP relay and EAP termination. You choose either mode
depending on support of the RADIUS server for EAP packets and EAP authentication methods.
• EAP relay mode.
EAP relay is defined in IEEE 802.1X. In this mode, the network device uses EAPOR packets to send
authentication information to the RADIUS server, as shown in Figure 26.
Figure 26 EAP relay
In EAP relay mode, the client must use the same authentication method as the RADIUS server. On
the access device, you only need to use the dot1x authentication-method eap command to enable
EAP relay.
• EAP termination mode.
As shown in Figure 27, the
access device performs the following operations in EAP termination
mode:
a. Terminates the EAP packets received from the client.
b. Encapsulates the client authentication information in standard RADIUS packets.
c. Uses PAP or CHAP to authenticate to the RADIUS server.
Figure 27 EAP termination
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