In addition to changing the switch-to-client retransmission time, you can change the number of times that the switch sends an EAP-request/identity frame (assuming no response is received) to the client before restarting the authentication process.
Note 
You should change the default value of this command only to adjust for unusual circumstances such as unreliable links or specific behavioral problems with certain clients and authentication servers.
Beginning in privileged EXEC mode, follow these steps to set the switch-to-client frame-retransmission number:
To return to the default retransmission number, use the no dot1x max-req global configuration command.
This example shows how to set 5 as the number of times that the switch sends an EAP-request/identity request before restarting the authentication process:
Switch(config)# dot1x max-req 5
You can attach multiple hosts to a single 802.1X-enabled port as shown in Figure 9-3. In this mode, only one of the attached hosts must be authorized for all hosts to be granted network access. If the port becomes unauthorized (re-authentication fails or an EAPOL-logoff message is received), all attached clients are denied access to the network.
With the multiple-hosts mode enabled, you can use 802.1X to authenticate the port and port security to manage network access for all MAC addresses, including that of the client.
Beginning in privileged EXEC mode, follow these steps to allow multiple hosts (clients) and port security on an 802.1X-authorized port that has the dot1x port-control interface configuration command set to auto.
To disable multiple hosts on the port, use the no dot1x multiple-hosts interface configuration command.
This example shows how to enable 802.1X on Fast Ethernet interface 0/1 and to allow multiple hosts:
Switch(config)# interface fastethernet0/1
Switch(config-if)# dot1x port-control auto
Switch(config-if)# dot1x multiple-hosts
Beginning in privileged EXEC mode, follow these steps to reset the 802.1X configuration to the default values:
To display 802.1X statistics for all interfaces, use the show dot1x statistics privileged EXEC command. To display 802.1X statistics for a specific interface, use the show dot1x statistics interface interface-id privileged EXEC command.
To display the 802.1X administrative and operational status for the switch, use the show dot1x privileged EXEC command. To display the 802.1X administrative and operational status for a specific interface, use the show dot1x interface interface-id privileged EXEC command.
For detailed information about the fields in these displays, refer to the command reference for this release.