ZyXEL NBG420N Manuel d'utilisateur télécharger pdf (Page 93)

Chapter 7 Wireless LAN

NBG420N User’s Guide

Figure 60 Roaming Example

The steps below describe the roaming process.

1 Wireless station Y moves from the coverage area of access point AP 1 to that of access

point AP 2.

2 Wireless station Y scans and detects the signal of access point AP 2.

3 Wireless station Y sends an association request to access point AP 2.

4 Access point AP 2 acknowledges the presence of wireless station Y and relays this

information to access point AP 1 through the wired LAN.

5 Access point AP 1 updates the new position of wireless station Y.

7.3.1 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.

3 The adjacent access points should use different radio channels when their coverage areas

overlap.

4 All access points must use the same port number to relay roaming information.

5 The access points must be connected to the Ethernet and be able to get IP addresses from

a DHCP server if using dynamic IP address assignment.

7.4 Quality of Service

This section discusses the Quality of Service (QoS) features available on the NBG420N.

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ZyXEL NBG420N Manuel d'utilisateur Page 93