Role Of Access Points By Using The Wds Device; Understanding Fast Secure Roaming - Allen-Bradley Stratix 5100 User Manual

Understanding Fast Secure
Roaming
Configuring WDS, Fast Secure Roaming, Radio Management, and Wireless Intrusion Detection Services

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.
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
Client
device
1. Authentication request
2. Identity request
3. Username
(relay to client)
5. Authentication response
(relay to client)
7. Authentication challenge
(relay to client)
9. Successful authentication
Rockwell Automation Publication 1783-UM006A-EN-P - May 2014
Wired LAN
Access point
or bridge
(relay to server)
4. Authentication challenge
(relay to server)
6. Authentication success
(relay to server)
8. Authentication response
(relay to server)
Chapter 13
RADIUS Server
377