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Catalyst 2950 and Catalyst 2955 Switch Software Configuration Guide
OL-10101-02
Chapter 9 Configuring IEEE 802.1x Port-Based Authentication
Configuring IEEE 802.1x Authentication
Enabling Periodic Re-Authentication
You can enable periodic IEEE 802.1x client re-authentication and specify how often it occurs. If you do
not specify a time period before enabling re-authentication, the number of seconds between
re-authentication attempts is 3600.
Beginning in privileged EXEC mode, follow these steps to enable periodic re-authentication of the client
and to configure the number of seconds between re-authentication attempts. This procedure is optional.
To disable periodic re-authentication, use the no dot1x reauthentication interface configuration
command. To return to the default number of seconds between re-authentication attempts, use the no
dot1x timeout reauth-period global configuration command.
This example shows how to enable periodic re-authentication and set the number of seconds between
re-authentication attempts to 4000:
Switch(config-if)# dot1x reauthentication
Switch(config-if)# dot1x timeout reauth-period 4000
Manually Re-Authenticating a Client Connected to a Port
You can manually re-authenticate the client connected to a specific port at any time by entering the dot1x
re-authenticate interface interface-id privileged EXEC command. This step is optional. If you want to
enable or disable periodic re-authentication, see the
“Enabling Periodic Re-Authentication” section on
page 9-19.
This example shows how to manually re-authenticate the client connected to a port:
Switch# dot1x re-authenticate interface fastethernet0/1
Command Purpose
Step 1
configure terminal Enter global configuration mode.
Step 2
interface interface-id Specify the interface to be configured, and enter interface configuration
mode.
Step 3
dot1x reauthentication Enable periodic re-authentication of the client, which is disabled by
default.
Step 4
dot1x timeout reauth-period {seconds |
server}
The keywords have these meanings:
• seconds—Sets the number of seconds from 1 to 65535; the default is
3600
seconds.
• server—Sets the number of seconds based on the value of the
Session-Timeout RADIUS attribute (Attribute[27]) and
Termination-Action RADIUS attribute (Attribute [29]).
Note The server keyword is not supported on Catalyst 2950 LRE
switches.
This command affects the behavior of the switch only if periodic
re-authentication is enabled.
Step 5
end Return to privileged EXEC mode.
Step 6
show dot1x interface interface-id Verify your entries.
Step 7
copy running-config startup-config (Optional) Save your entries in the configuration file.