Consolidated Platform Configuration Guide, Cisco Ios Release 15.2(4)E (Catalyst 2960-X Switches - Cisco Catalyst 2960 series Configuration Manual

This figure shows the authentication process.
Figure 91: Authentication Flowchart
The switch re-authenticates a client when one of these situations occurs:
• Periodic re-authentication is enabled, and the re-authentication timer expires.
You can configure the re-authentication timer to use a switch-specific value or to be based on values
from the RADIUS server.
After 802.1x authentication using a RADIUS server is configured, the switch uses timers based on the
Session-Timeout RADIUS attribute (Attribute[27]) and the Termination-Action RADIUS attribute
(Attribute [29]).
The Session-Timeout RADIUS attribute (Attribute[27]) specifies the time after which re-authentication
occurs.
The Termination-Action RADIUS attribute (Attribute [29]) specifies the action to take during
re-authentication. The actions are Initialize and ReAuthenticate. When the Initialize action is set (the
attribute value is DEFAULT), the 802.1x session ends, and connectivity is lost during re-authentication.
When the ReAuthenticate action is set (the attribute value is RADIUS-Request), the session is not affected
during re-authentication.
• You manually re-authenticate the client by entering the dot1x re-authenticate interface interface-id
privileged EXEC command.

Consolidated Platform Configuration Guide, Cisco IOS Release 15.2(4)E (Catalyst 2960-X Switches)

Information About 802.1x Port-Based Authentication
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