Configuring The Switch-To-Radius-Server Communication - Cisco Catalyst 2975 Software Configuration Manual

Chapter 10 Configuring IEEE 802.1x Port-Based Authentication
Beginning in privileged EXEC mode, follow these steps to configure 802.1x port-based authentication:
Command
Step 1
configure terminal
Step 2
aaa new-model
Step 3 aaa authentication dot1x {default}
method1
Step 4
dot1x system-auth-control
Step 5
aaa authorization network {default}
group radius
Step 6 radius-server host ip-address
Step 7 radius-server key string
Step 8 interface interface-id
Step 9 switchport mode access
Step 10 authentication port-control auto
or
dot1x port-control auto
Step 11
end
Step 12 show authentication
or
show dot1x
Step 13 copy running-config startup-config

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.
OL-19720-02
Purpose
Enter global configuration mode.
Enable AAA.
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.
Though other keywords are visible in the command-line help
Note
string, only the group radius keywords are supported.
Enable 802.1x authentication globally on the switch.
(Optional) Configure the switch to use user-RADIUS authorization for all
network-related service requests, such as VLAN assignment.
(Optional) Specify the IP address of the RADIUS server.
(Optional) Specify the authentication and encryption key used between
the switch and the RADIUS daemon running on the RADIUS server.
Specify the port connected to the client to enable for 802.1x
authentication, and enter interface configuration mode.
(Optional) Set the port to access mode only if you configured the RADIUS
server in Step 6 and Step 7.
Enable 802.1x authentication on the port.
For feature interaction information, see the
Configuration Guidelines" section on page
Return to privileged EXEC mode.
Verify your entries.
(Optional) Save your entries in the configuration file.
Catalyst 2975 Switch Software Configuration Guide
Configuring 802.1x Authentication
"802.1x Authentication
10-35.
10-41