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WLAN Architecture
A WLAN has a wired side and a wireless side. On the wired side, an AP connects to the Internet using Ethernet. On the wireless side, a STA communicates with an AP using 802.11 standards. The WLAN architecture on the wireless side includes the centralized architecture.
Fit AP Architecture
In the Fit AP architecture, an AC centrally
manages and controls multiple APs (Fit APs), as shown in Figure 4-7.
An AC and APs implement wireless access.
- The AC implements all security, control, and management functions. These functions include mobile user management, identity authentication, VLAN assignment, radio management, and data forwarding.
- Fit APs implement wireless radio access, including radio signal transmission and detection response, data encryption and decryption, and data transmission acknowledgment.
- The AC and APs communicate using Control and Provisioning of Wireless Access Points (CAPWAP). They can be connected across a Layer 2 or Layer 3 network.
In centralized architecture, wireless access involves
the following operations:
- Fit APs establish CAPWAP tunnels with an AC. For details, see AP Online Process.
- STAs associate with a Fit AP. For details, see STA Access.
