Interlogix GE-DSSG-244-POE User Manual - Manual (Page 175)

IFS NS3601-24P/4S GE-DSSG-244 and 244-POE User Manual
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Understanding IEEE 802.1X Port-Based Authentication
The IEEE 802.1X standard defines a client-server-based access control and authentication protocol that restricts unauthorized
clients from connecting to a LAN through publicly accessible ports. The authentication server authenticates each client connected to
a switch port before making available any services offered by the switch or the LAN.
Until the client is authenticated, 802.1X access control allows only Extensible Authentication Protocol over LAN (EAPOL) traffic
through the port to which the client is connected. After authentication is successful, normal traffic can pass through the port.
This section includes this conceptual information:
• Device Roles
• Authentication Initiation and Message Exchange
• Ports in Authorized and Unauthorized States
„ Device Roles
With 802.1X port-based authentication, the devices in the network have specific roles as shown below.
Figure 4-11-1
z Client
—the device (workstation) that requests access to the LAN and switch services and responds to requests from the
switch. The workstation must be running 802.1X-compliant client software such as that offered in the Microsoft Windows XP
operating system. (The client is the supplicant in the IEEE 802.1X specification.)
z Authentication server —performs the actual authentication of the client. The authentication server validates the identity of
the client and notifies the switch whether or not the client is authorized to access the LAN and switch services. Because the
switch acts as the proxy, the authentication service is transparent to the client. In this release, the Remote Authentication
Dial-In User Service (RADIUS) security system with Extensible Authentication Protocol (EAP) extensions is the only
supported authentication server; it is available in Cisco Secure Access Control Server version 3.0. RADIUS operates in a
client/server model in which secure authentication information is exchanged between the RADIUS server and one or more
RADIUS clients.
z Switch (802.1X device) —controls the physical access to the network based on the authentication status of the client. The