if i do not instal usteer or dawn, just keep both wireless ssid name for 2.4ghz and 5ghz same, and enable the fast transition from luci in wireless ssid settings, will it work like band steering?
Or i have to have usteer/dawn installed?
is the same as on other access point vendors in default dumb behavior: clients then passively tend to connect to the stronger signal or whatever comes first in their internal list, which usually is 2.4 GHz.
That is, what tools like usteer try to address: it forces clients actively into a certain radio, based on more sophisticated criterias.
Roaming decisions are always made by the client, which decides which network to use. usteer/ dawn or other methods of band-steering can only try to nudge the clients into a particular/ preferred direction - be it passively, by giving the client more information about the BSSID (expected throughput, connected clients, etc.) via 802.11k/v, making roaming less disruptive and easier palatable via 802.11r - or actively, by forcefully kicking clients from the non-preferred BSSID(s).
Even in the absence of 802.11k/v/r or active bandsteering, modern clients tend to make decent roaming decisions, sticky clients or clients preferring the stronger-but-slower 2.4 GHz BSSID over the 5 GHz one 'should' mostly be a thing of the past. In most cases active bandsteering is not necessary, adding (passive) 802.11k/v information may be beneficial, although few clients will look at that (at least no harm done), 802.11r often introduces more issues with non-behaving clients which don't know what 802.11r is. Managing active bandsteering is a bit more complex and involved, it may also be at odds with some clients (by declining 2.4 GHz connectivity, some clients may not succeed connecting).
Bandsteering becomes more interesting with lots of moving clients, roaming between >>3 APs (ideally even using directional antennas) over a larger area.
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