![]() For properly designed WLANs, roaming should be seamless, but very often we found it hit-and-miss. When a target BSS hears the frame, it will send back a Probe Response to get that client associated. When a client device successfully connects to a WLAN, the client stores SSID in its profile, and constantly broadcasts Probe Request frames with that SSID. The main purpose of ESS is to expand the coverage of WLAN while facilitating client roaming. We refer to a collection of these BSSs as an ESS or Extended Service Set.ĮSS is typically managed by wireless LAN controllers. You can name your SSID whatever you want, and it doesn’t have to be unique (there are a few rules like SSID must be less than 32 chars and exclude some special chars).Ī company typically have many APs within its network, which all configured using the same SSID. These are names that show up on your devices when you search for Wi-Fi. There can be many BSSs in the air, so we use SSID or Service Set Identification to label our wireless networks.
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