Cisco WS-C2960-24TC-S Software Guide - Page 202
MAC Authentication Bypass, Upgrading from a Previous Software Release
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Configuring IEEE 802.1x Authentication Chapter 9 Configuring IEEE 802.1x Port-Based Authentication - If the Windows XP client is configured for DHCP and has an IP address from the DHCP server, receiving an EAP-Success message on a critical port might not re-initiate the DHCP configuration process. - You can configure the inaccessible authentication bypass feature and the restricted VLAN on an IEEE 802.1x port. If the switch tries to re-authenticate a critical port in a restricted VLAN and all the RADIUS servers are unavailable, switch changes the port state to the critical authentication state and remains in the restricted VLAN. - You can configure the inaccessible bypass feature and port security on the same switch port. • You can configure any VLAN except an RSPAN VLAN or a voice VLAN as an IEEE 802.1x restricted VLAN. The restricted VLAN feature is not supported on trunk ports; it is supported only on access ports. MAC Authentication Bypass These are the MAC authentication bypass configuration guidelines: • Unless otherwise stated, the MAC authentication bypass guidelines are the same as the IEEE 802.1x authentication guidelines. For more information, see the "IEEE 802.1x Authentication" section on page 9-20. • If you disable MAC authentication bypass from a port after the port has been authorized with its MAC address, the port state is not affected. • If the port is in the unauthorized state and the client MAC address is not the authentication-server database, the port remains in the unauthorized state. However, if the client MAC address is added to the database, the switch can use MAC authentication bypass to re-authorize the port. • If the port is in the authorized state, the port remains in this state until re-authorization occurs. Upgrading from a Previous Software Release In Cisco IOS Release 12.2(25)SEE, the implementation for IEEE 802.1x authentication changed from the previous releases. When IEEE 802.1x authentication is enabled, information about Port Fast is no longer added to the configuration and this information appears in the running configuration: dot1x pae authenticator Configuring IEEE 802.1x Authentication To configure IEEE 802.1x port-based authentication, you must enable authentication, authorization, and accounting (AAA) and specify the authentication method list. A method list describes the sequence and authentication method to be queried to authenticate a user. To allow VLAN assignment, you must enable AAA authorization to configure the switch for all network-related service requests. This is the IEEE 802.1x AAA process: Step 1 Step 2 Step 3 A user connects to a port on the switch. Authentication is performed. VLAN assignment is enabled, as appropriate, based on the RADIUS server configuration. 9-22 Catalyst 2960 Switch Software Configuration Guide OL-8603-04
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