2 internet house w/ mesh

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The original was posted on /r/homenetworking by /u/No-Astronaut-7552 on 2023-12-07 03:03:54+00:00.

I have 2 internets & a whole home mesh system. Tonight my primary internet went out, and it was a tedious process to get the secondary plugged in & running the mesh again. Is there an Ethernet switchover at all? Like, a setup where 2 active internet lines plug into a “splitter” with a button (or something) and one line comes out of it, into my Orbi. And in a perfect world, all I’d have to do is press the button to crossover to the secondary internet when needed. If this exists, and I’m just not searching it the right way, sorry for the stupid question! Thanks for any help with this!