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signal of a new access point, which then informs the access points on the LAN about the change. The new information is then propagated to the other access points on the LAN. An example is shown in Figure
If the roaming feature is not enabled on the access points, information is not communicated between the access points when a wireless station moves between coverage areas. The wireless station may not be able to communicate with other wireless stations on the network and vice versa.
Figure 3-10 Roaming Example
The steps below describe the roaming process.
Step 1. As wireless station Y moves from the coverage area of access point AP 1 to that of acces point AP 2, it scans and uses the signal of access point AP 2.
Step 2. Access point AP 2 acknowledges the pressence of wireless station Y and relays this information to access point AP 1 through the wired LAN.
Step 3. Access point AP 1 updates the new position of wireless station .
Step 4. Wireless station Y sends a request to access point AP 2 for reauthentication.
3.11.4 Requirements for Roaming
The following requirements must be met in order for wireless stations to roam between the coverage areas.
1.All the access points must be on the same subnet and configured with the same ESSID.
2.If IEEE 802.1x user authentication is enabled and to be done locally on the access point, the new access point must have the user profile for the wireless station.
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