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Campus Wireless Networks Validated Reference Design Version 3.3 | Design Guide Aruba’s User-Centric Network Architecture | 11
Multi-function Thin Access Points
Aruba’s access points serve multiple functions depending on their role in the network. APs are either
indoor or outdoor deployable; and are available with various options, such as fixed or removable
antennas, single or dual radio APs, and depending on the AP, can operate in one or more of the a/b/g/n
spectrums. Selection of hardware based options should be considered depending on the deployment.
Functionality is defined by the role assigned through software modules and administrator
configuration. Each radio on an Aruba AP can serve in one of five different roles. These roles include:
z Access Point (Local AP)
z Air Monitor
z Mesh Portal
z Mesh Point
z Remote AP
In some modes, the Aruba APs can operate as remote capture devices saving the network staff from
having to walk to a problem area to use a handheld sniffer for troubleshooting.
Access Point
The most typical deployment uses an Aruba AP in the Access Point role. In this role, the AP radio(s) are
used to connect user to the network infrastructure. The AP acts as a thin radio with much of the
functionality of the system taking place on the Mobility Controller. Traffic is not processed on the AP.
Instead, it is tunneled as an encrypted 802.11 frame to the controller via GRE. When an AP is connected
to access layer switches it is known as a “campus-connected” or “local” AP.
Air Monitor
Used as an Air Monitor, the AP works as a network sniffer. The air monitor looks for rogue APs,
monitors the RF environment and wired environment, and when combined with the wireless intrusion
detection system (WIDS) software license it acts as a WIDS sensor to protect the network from those
violating policy. The system can classify interfering and rogue APs based on network traffic and RF
monitoring. Aruba APs can be dedicated to the Air Monitor function or can perform this role on a part-
time basis when configured in the Access Point role.