Specifications

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Catalyst 2950 and Catalyst 2955 Switch Software Configuration Guide
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Chapter 10 Configuring 802.1X Port-Based Authentication
Configuring 802.1X Authentication
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
Enabling Multiple Hosts
You can attach multiple hosts to a single 802.1X-enabled port as shown in Figure 10-3 on page 10-7. 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 (for switches running the EI).
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.
Command Purpose
Step 1
configure terminal Enter global configuration mode.
Step 2
dot1x max-req count Set the number of times that the switch sends an EAP-request/identity
frame to the client before restarting the authentication process. The range
is 1 to 10; the default is 2.
Step 3
end Return to privileged EXEC mode.
Step 4
show dot1x Verify your entries.
Step 5
copy running-config startup-config (Optional) Save your entries in the configuration file.
Command Purpose
Step 1
configure terminal Enter global configuration mode.
Step 2
interface interface-id Enter interface configuration mode, and specify the interface to which
multiple hosts are indirectly attached.
Step 3
dot1x multiple-hosts Allow multiple hosts (clients) and port security on an 802.1X-authorized
port.
Make sure that the dot1x port-control interface configuration command
set is set to auto for the specified interface.
Step 4
end Return to privileged EXEC mode.
Step 5
show dot1x interface interface-id Verify your entries.
Step 6
copy running-config startup-config (Optional) Save your entries in the configuration file.