Operation Manual – 802.1x and System Guard
H3C S3100-52P Ethernet switch
Chapter 1 802.1x Configuration
1-10
Supplicant
system
PAE
Authenticator
system PAE
RADIUS server
EAPOL
RADIUS
EAPOL- Start
EAP- Request /Identity
EAP- Response/Identity
EAP- Request/ MD5 Challenge
EAP- Success
EAP- Response/MD5 Challenge
RADIUS Access-Request
( CHAP- Response/MD5 Challenge)
RADIUS Access- Accept
( CHAP -Success)
Port
authorized
Handshake timer
Handshake request
[EAP- Request/Identity]
Handshake response
[EAP- Response/Identity]
EAPOL- Logoff
......
Port
unauthorized
Figure 1-9
802.1x authentication procedure (in EAP terminating mode)
The authentication procedure in EAP terminating mode is the same as that in the EAP
relay mode except that the randomly-generated key in the EAP terminating mode is
generated by the switch, and that it is the switch that sends the user name, the
randomly-generated key, and the supplicant system-encrypted password to the
RADIUS server for further authentication.
1.1.5 Timers Used in 802.1x
In 802.1 x authentication, the following timers are used to ensure that the supplicant
system, the switch, and the RADIUS server interact in an orderly way.
z
Handshake timer (
handshake-period
). This timer sets the handshake period and
is triggered after a supplicant system passes the authentication. It sets the interval
for a switch to send handshake request packets to online users. You can set the
maximum number of transmission attempts by using the
dot1x retry
command.
An online user will be considered offline when the switch has not received any
