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Catalyst 3750 Switch Software Configuration Guide
78-16180-02
Chapter 10 Configuring 802.1x Port-Based Authentication
Configuring 802.1x Authentication
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 re-authentication number. This
procedure is optional.
To return to the default re-authentication number, use the no dot1x max-reauth-req interface
configuration command.
This example shows how to set 4 as the number of times that the switch restarts the authentication
process before the port changes to the unauthorized state:
Switch(config-if)# dot1x max-reauth-req 4
Configuring the Host Mode
You can configure an 802.1x port for single-host or for multiple-hosts mode. In single-host mode, only
one host is allowed on an 802.1x port. When the host is authenticated, the port is placed in the authorized
state. When the host leaves the port, the port becomes unauthorized. Packets from hosts other than the
authenticated one are dropped.
You can attach multiple hosts to a single 802.1x-enabled port as shown in Figure 10-3 on page 10-6. In
this mode, only one of the attached hosts must be successfully 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) on an
802.1x-authorized port that has the dot1x port-control interface configuration command set to auto.
This procedure is optional.
Command Purpose
Step 1
configure terminal Enter global configuration mode.
Step 2
interface interface-id Specify the port to be configured, and enter interface configuration mode.
Step 3
dot1x max-reauth-req count Set the number of times that the switch restarts the authentication process
before the port changes to the unauthorized state. The range is 1 to 10; the
default is 2.
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.
Command Purpose
Step 1
configure terminal Enter global configuration mode.
Step 2
interface interface-id Specify the port to which multiple hosts are indirectly attached, and enter
interface configuration mode.
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