The Basic Service Set Identifier (BSSID) defines the most basic infrastructure mode network, a BSS of one WAP and one or more wireless nodes.With such a simple network, the Wi-Fi folks didn't see any reason to create some new numbering or naming scheme, so they made the BSSID the same as the MAC address for the WAP.nfortunately, most Wi-Fi devices just use the term SSID, not ESSID. When you configure a wireless device to connect to an ESS, you're technically using the ESSID rather than just the SSID, but the manufacturer often has tried to make it simple for you by using only the term SSID.