WESM zl Management and Configuration Guide WT.01.28 and greater

4-9
Wireless Local Area Networks (WLANs)
Configuration Options: Normal Versus Advanced Mode
Figure 4-5. Viewing Six WLANs Assigned to a Radio (Normal)
RP radios send beacon frames to announce the WLANs that they support. The source
of a beacon frame is a BSSID, and each beacon can include only one SSID. Therefore,
if you enable more than four WLANs, RPs support all of them, but only announce
the first four. The WLAN that each BSSID announces is the primary WLAN—in
normal mode, always the WLAN with the lowest index number on that BSSID.
On the Network Setup > Radio > WLAN Assignment screen, a green check mark
under the beacon icon indicates the SSID that the RP announces. For example, in
Figure 4-5, the RP uses BSSID 1 to send beacons for SSID A, but not for SSID E.
While RPs do not beacon non-primary WLANs, they do respond to probes for them,
so wireless stations can connect these WLANs. Some wireless clients require the user
to manually input the correct SSID; others automatically send out probes and
discover the SSID.
You can configure WLANs 1 through 4 to operate in closed system. In this case, the
RP does not announce any SSID in beacons from that BSSID. (It does not announce
the SSID for another WLAN sharing that BSSID.)