IEEE 802.1X Wake on LAN Support
IEEE 802.1X Wake on LAN Support
Last Updated: July 17, 2012
The IEEE 802.1X Wake on LAN (WoL) Support feature allows dormant PCs to be powered up when the switch receives a specific Ethernet frame, known as the "magic packet." You can use this feature in environments where administrators need to connect to systems that have been powered down.
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.
Use Cisco Feature Navigator to find information about platform support and Cisco software image support. To access Cisco Feature Navigator, go to www.cisco.com/go/cfn. An account on Cisco.com is not required.
Prerequisites for IEEE 802.1X Wake on LAN Support
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 Sytem (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 Wake on LAN Support
Information About IEEE 802.1X Wake on LAN Support
IEEE 802.1X Authentication with Wake on LAN
The IEEE 802.1X authentication with wake on LAN (WoL) feature allows dormant PCs to be powered when the switch receives a specific Ethernet frame, known as the "magic packet." You can use this feature in environments where administrators need to connect to systems that have been powered off.
When a host that uses WoL is attached through an 802.1X port and the host powers off, the 802.1X port becomes unauthorized. The port can only receive and send EAPOL packets, and WoL magic packets cannot reach the host. When the PC is powered off, it is not authorized, and the switch port is not opened.
When the switch uses 802.1X authentication with WoL, the switch forwards traffic to unauthorized 802.1x ports, including magic packets. While the port is unauthorized, the switch continues to block ingress traffic other than EAPOL packets. The host can receive packets but cannot send packets to other devices in the network.
When you configure a port as unidirectional by using the authentication control-direction command in interface configuration command, the port changes to the spanning-tree forwarding state. The port can send packets to the host but cannot receive packets from the host.
When you configure a port as bidirectional by using the authentication control-direction both interface configuration command, the port is access-controlled in both directions. The port does not receive packets from or send packets to the host.
How to Configure IEEE 802.1X Wake on LAN Support
Configuring IEEE 802.1X Authentication with Wake on LAN
Configuration Examples for IEEE 802.1X Wake on LAN Support
Feature Information for IEEE 802.1X Wake on LAN Support
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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