802.1X is an IEEE standard for authorizing clients to log into and use a network. The authorization process involves these participants:
To set up 802.1X authentication, you must configure a switch as an authenticator and identify the authentication server, which is typically a RADIUS server. To configure a switch, choose Device > 802.1X and use the 802.1X window. To identify the authentication server, use the radius-server command on the CLI.
"Configuring
802.1X Port-Based Authentication," Catalyst 2950 Desktop Switch Software
Configuration Guide
"Configuring
802.1X Port-Based Authentication," Catalyst 3550 Multilayer Switch Software
Configuration Guide