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Catalyst 2975 Switch Software Configuration Guide
OL-19720-02
Chapter 10 Configuring IEEE 802.1x Port-Based Authentication
Configuring 802.1x Authentication
To disable multiple hosts on the port, use the
no
authentication host-mode
or the
no dot1x host-mode
multi-host
interface configuration command.
This example shows how to enable 802.1x authentication and to allow multiple hosts:
Switch(config)#
interface gigabitethernet2/0/1
Switch(config-if)#
dot1x port-control auto
Switch(config-if)#
dot1x host-mode multi-host
Switch(config-if)#
end
This example shows how to enable MDA and to allow both a host and a voice device on the port:
Switch(config)#
interface gigabitethernet2/0/1
Switch(config-if)#
dot1x port-control auto
Switch(config-if)#
dot1x host-mode multi-domain
Switch(config-if)#
switchport voice vlan
101
Switch(config-if)#
end
Configuring Periodic Re-Authentication
You can enable periodic 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 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.
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
authentication periodic
or
dot1x reauthentication
Enable periodic re-authentication of the client, which is disabled by
default.
Step 4
authentication timer
{{[
inactivity
|
reauthenticate
]} {
restart
value
}}
or
dot1x timeout reauth-period
{
seconds
|
server
}
Set the number of seconds between re-authentication attempts.
The
authentication timer
keywords have these meanings:
•
inactivity
—Interval in seconds after which if there is no activity from
the client then it is unauthorized
•
reauthenticate
—Time in seconds after which an automatic
re-authentication attempt is be initiated
•
restart
value
—Interval in seconds after which an attempt is made to
authenticate an unauthorized port
The
dot1x timeout reauth-period
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 the
Termination-Action RADIUS attribute (Attribute [29]).
This command affects the behavior of the switch only if periodic
re-authentication is enabled.
