"Layer 3 roaming"

Allowing payload data from the wireless LAN to pass-through the WLC tunnel to the WLC enables roaming even beyond the limits of broadcast domains. In this example application, a layer-3 switch between the floors prevents the transmission of broadcasts, and thus separates the broadcast domains.

In this example, two user groups A and B each have access to their own WLAN (SSID). On all floors of the building, the APs provide two SSIDs, 'GROUP_A' and 'GROUP_B'.

Figure 1. Example application for layer-3 roaming

The diagram shows a sample application with the following components:

The aim of the configuration: When moving to another floor, a WLAN client that associates with a particular SSID is to retain access to its "own" WLAN, regardless of which AP is being used and regardless of the segment in which the client is located. Since the segments in this example use different IP address ranges, this scenario can only be implemented by managing the APs directly with the central WLC via layer 3 and across the boundaries of the VLANs.

Note: The configuration corresponds to the example Overlay network: Separating networks for access points without using VLAN.

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