Rockwell Automation 1783-WAPxxx Stratix 5100 Wireless Access Point User Manual - Manual (Page 377)

Rockwell Automation Publication 1783-UM006A-EN-P - May 2014 377
Configuring WDS, Fast Secure Roaming, Radio Management, and Wireless Intrusion Detection Services Chapter 13
Role of Access Points by Using the WDS Device
The access points on your wireless LAN interact with the WDS device in these
activities:
• Discover and track the current WDS device and relay WDS
advertisements to the wireless LAN.
• Authenticate with the WDS device and establish a secure communication
channel to the WDS device.
• Register associated client devices with the WDS device.
• Report radio data to the WDS device.
Understanding Fast Secure
Roaming Access points in many wireless LANs serve mobile client devices that roam from
access point to access point throughout the installation. Some applications
running on client devices require fast reassociation when they roam to a different
access point. Voice applications, for example, require seamless roaming to prevent
delays and gaps in conversation.
During normal operation, LEAP-enabled client devices mutually authenticate
with a new access point by performing a complete LEAP authentication,
including communication with the main RADIUS server.
Figure 97 - Client Authentication by Using a RADIUS Server
Access point
or bridge
Wired LAN
Client
device
RADIUS Server
1. Authentication request
2. Identity request
3. Username
(relay to client)
(relay to server)
4. Authentication challenge
5. Authentication response
(relay to client)
(relay to server)
6. Authentication success
7. Authentication challenge
(relay to client)
(relay to server)
8. Authentication response
9. Successful authentication (relay to server)
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