Small update to this setup. I've replaced the upstairs gigabit switch with a 5th generation AirPort Extreme. Just because really. Found one dirt cheap so I've disabled it's wireless AP and I'm just using it as a gigabit switch. But now at least I can manage it, and it shows up in the AirPort Utility app.
I'll post up a screen grab of the network map for those interested later.
I'll post up a screen grab of the network map for those interested later.
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