10-41
Catalyst 2975 Switch Software Configuration Guide
OL-19720-02
Chapter 10 Configuring IEEE 802.1x Port-Based Authentication
Configuring 802.1x Authentication
Beginning in privileged EXEC mode, follow these steps to configure 802.1x port-based authentication:
Configuring the Switch-to-RADIUS-Server Communication
RADIUS security servers are identified by their hostname or IP address, hostname and specific UDP port
numbers, or IP address and specific UDP port numbers. The combination of the IP address and the UDP
port number creates a unique identifier, which enables RADIUS requests to be sent to multiple UDP
ports on a server at the same IP address. If two different host entries on the same RADIUS server are
configured for the same service—for example, authentication—the second host entry configured acts as
the fail-over backup to the first one. The RADIUS host entries are tried in the order in which they were
configured.
Command
Purpose
Step 1
configure terminal
Enter global configuration mode.
Step 2
aaa new-model
Enable AAA.
Step 3
aaa authentication dot1x
{
default
}
method1
Create an 802.1x authentication method list.
To create a default list to use when a named list is
not
specified in the
authentication
command, use the
default
keyword followed by the
method to use in default situations. The default method list is
automatically applied to all ports.
For
method1
, enter the
group radius
keywords to use the list of all
RADIUS servers for authentication.
Note
Though other keywords are visible in the command-line help
string, only the
group radius
keywords are supported.
Step 4
dot1x system-auth-control
Enable 802.1x authentication globally on the switch.
Step 5
aaa authorization network
{
default
}
group radius
(Optional) Configure the switch to use user-RADIUS authorization for all
network-related service requests, such as VLAN assignment.
Step 6
radius-server host
ip-address
(Optional) Specify the IP address of the RADIUS server.
Step 7
radius-server key
string
(Optional) Specify the authentication and encryption key used between
the switch and the RADIUS daemon running on the RADIUS server.
Step 8
interface
interface-id
Specify the port connected to the client to enable for 802.1x
authentication, and enter interface configuration mode.
Step 9
switchport mode access
(Optional) Set the port to access mode only if you configured the RADIUS
server in Step 6 and Step 7.
Step 10
authentication port-control auto
or
dot1x port-control auto
Enable 802.1x authentication on the port.
For feature interaction information, see the
Configuration Guidelines” section on page 10-35
Step 11
end
Return to privileged EXEC mode.
Step 12
show authentication
or
show dot1x
Verify your entries.
Step 13
copy running-config startup-config
(Optional) Save your entries in the configuration file.
