WESM zl Management and Configuration Guide WT.01.28 and greater

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Introduction
Radio Ports
Figure 1-20. ESS
Similarly, when configuring the Wireless Edge Services zl Module, you are often
more interested in the WLAN to which users connect than in the particular RP to
which a user connects at any given moment.
SSID Versus BSSID
As indicated above, the SSID identifies a group of BSSs that make up a single WLAN.
All frames transmitted in a WLAN are marked with this SSID. Wireless media can
be very busy, and wireless devices limit the number of superfluous frames that they
must process by accepting only frames marked with the SSID of their WLAN.