IEEE 802.1X Open Authentication
IEEE 802.1X Open Authentication
Last Updated: July 17, 2012
IEEE 802.1X Open Authentication allows a host to have network access without having to go through IEEE 802.1X authentication. Open authentication is useful in an applications such as the Preboot Execution Environment (PXE), where a device must access the network to download a bootable image containing an authentication client.
Finding Feature Information
Your software release may not support all the features documented in this module. For the latest feature information and caveats, see the release notes for your platform and software release. To find information about the features documented in this module, and to see a list of the releases in which each feature is supported, see the Feature Information Table at the end of this document.
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Prerequisites for IEEE 802.1X Open Authentication
IEEE 802.1X Port-Based Network Access Control
You should understand the concepts of port-based network access control and have an understanding of how to configure port-based network access control on your Cisco platform. For more information, see the Configuring IEEE 802.1X Port-Based Authentication module.
The switch must be connected to a Cisco secure Access Control System (ACS) and RADIUS authentication, authorization, and accounting (AAA) must be configured for Web authentication. If appropriate, you must enable ACL download.
If the authentication order includes the 802.1X port authentication method, you must enable IEEE 802.1X authentication on the switch.
If the authentication order includes web authentication, configure a fallback profile that enables web authentication on the switch and the interface.
You should understand the concepts of the RADIUS protocol and have an understanding of how to create and apply access control lists (ACLs). For more information, see the documentation for your Cisco platform and the Cisco IOS Security Configuration Guide: Securing User Services.
The switch must have a RADIUS configuration and be connected to the Cisco secure access control server (ACS). For more information, see the Configuration Guide for CISCO Secure ACS.
Restrictions for IEEE 802.1X Open Authentication
Information About IEEE 802.1X Open Authentication
IEEE 802.1X Open Authentication and Host Modes
Any of the four host modes (single-host mode, multiple-host mode, multi-domain authentication mode, and multiauthentication mode) may be configured to allow a device to gain network access before authentication. For information about configuring IEEE 802.1X host modes, see the "Configuring the Host Mode" section of the "Configuring IEEE 802.1X Port-Based Authentication" chapter.
Open authentication is enabled by entering the authentication open command after host mode configuration, and acts as an extension to the configured host mode. For example, if open authentication is enabled with single-host mode, then the port will allow only one MAC address. When preauthentication open access is enabled, initial traffic on the port is restricted only by whatever other access restriction, independent of 802.1X, is configured on the port. If no access restriction other than 802.1X is configured on the port, then a client device will have full access on the configured VLAN.
How to Configure IEEE 802.1X Open Authentication
Configuring IEEE 802.1X Open Authentication
Before You BeginSUMMARY STEPS
Configuration Examples for IEEE 802.1X Open Authentication
Example: Configuring IEEE 802.1X Open Authentication
The following example shows how to enable the Open Authentication feature on a port that has been configured in single-host mode:
Switch(config)# interface gigabitethernet0/1 Switch(config-if)# authentication port-control auto Switch(config-if)# authentication host-mode single-host Switch(config-if)# authentication open
Feature Information for IEEE 802.1X Open Authentication
The following table provides release information about the feature or features described in this module. This table lists only the software release that introduced support for a given feature in a given software release train. Unless noted otherwise, subsequent releases of that software release train also support that feature.
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