• The HTTP traffic is intercepted, and authorization is initiated. The switch sends the login page to the user. The user enters a username and password, and the switch sends the entries to the authentication server. • If the authentication succeeds, the switch downloads and activates the user’s access policy from the authentication server. The login success page is sent to the user. • If the authentication fails, the switch sends the login fail page. The user retries the login. If the maximum number of attempts fails, the switch sends the login expired page, and the host is placed in a watch list. After the watch list times out, the user can retry the authentication process.
• If the authentication server does not respond to the switch, and if an AAA fail policy is configured, the switch applies the failure access policy to the host. The login success page is sent to the user. • The switch reauthenticates a client when the host does not respond to an ARP probe on a Layer 2 interface, or when the host does not send any traffic within the idle timeout on a Layer 3 interface. • The switch reauthenticates a client when the host does not respond to an ARP probe on a Layer 2 interface. • The feature applies the downloaded timeout or the locally configured session timeout.
• If the terminate action is RADIUS, the feature sends a nonresponsive host (NRH) request to the server. The terminate action is included in the response from the server. • If the terminate action is default, the session is dismantled, and the applied policy is removed. Local Web Authentication Banner With Web Authentication, you can create a default and customized web-browser banners that appears when you log in to a switch. The banner appears on both the login page and the authentication-result pop-up pages. The default banner messages are as follows: Authentication Successful Authentication Failed Authentication Expired The Local Web Authentication Banner can be configured in as follows:
• Legacy mode—Use the ip admission auth-proxy-banner http global configuration command. • New-style mode—Use the parameter-map type webauth global banner global configuration command. The default banner Cisco Systems and Switch host-name Authentication appear on the Login Page. Cisco Systems appears on the authentication result pop-up page. Web-Based Authentication Local Web Authentication Banner Web-Based Authentication 4