#Ideal network topology for SmartHome
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I'm not sure your question makes any sense
- Is run network cables
- Is use IP address
It also assumes all your devices will be wired, what about Zigbee, Z-Wave, Thread, etc?
Primarily just cable
It doesn't always have to be IP, different types of buses can be used such as DALI, KNX etc.
Zigbee, Z-Wave, Thread are all wireless technologies that I would rather avoid when designing a network topology.
Everybody's version of "ideal" will differ, but hopefully somebody will be along who understands your question better 
Maybe my point got lost in translation. I apologize. Can I clarify something to make my question more meaningful?
Asking about your attempted solution rather than your actual problem
What's your goals here? What are you wanting to achieve?
Oh, I see.
I want to control the whole house with Home Assitant, but at the same time ensure that if Home Assistant fails, the smart house continues to function at least partially. Or decentralised.
I want to minimize electromagnetic radiation and maximize safety. Therefore, I will run everything in cables and only the bare minimum in wireless technologies.
Have I managed to explain my needs better?
KNX is probably your best solution then. Just not a cheap one.
I have considered KNX as well as DALI for lights, I like the bus connection , security, decentralization, but I am bothered by the limited number of devices that support KNX :(. + price and complexity of setup.
There's a youtube channel called "Superhouse" or something by some crazy dude who has run 2 cat6 to every light switch and socket around his house and put a full size arduino into everything...
It's probably rock solid and infinitely expandable, but definitely not cheap.
Fully wired setups tend to be more expensive, because they're professional level (or at least priced that way)
If you want affordable you have to give up the desire to wire everything
You can do a lot with both Zigbee and Z-Wave to let things work when HA isn't working - whether that's by using smart switches instead of smart bulbs or using binding (Zigbee) or association (Z-Wave) to let devices directly control another one.
Of course, I can count on the thumbs of one hand the number of unplanned outages I've had of my smart home in the last 6+ years
Yeah I know SuperHouse and it looks great, the price is not that big of a deal, but everything is built on MQTT. Which means if his MQTT broker goes down, the whole house is dead ๐ฆ
It's not hard to design a system that's highly available, it just costs more
If you want highly available and redundant you have to pay for that. You don't get something for nothing.
I'm willing to pay ๐
Yeah, but you said you're bothered by the price of KNX ๐
So, maybe not so willing 
What lights would you recommend for a smart home, controlled by wire? I don't think I know of any.
Smart switch/dimmer
My main problem with KNX is the limited availability of devices.
And you've carefully avoided mentioning where in the world you are...
Here in the UK a quick search turned up loads of KNX options
But the smart switch/dimmer won't allow for circadian rhythms in the lights, will it? Or does it?
Not for colour temperature, no
But you're going to find very few wired smart lights AFAIK
Czech Republic .)
A smart light on an ethernet cable would be ideal :). But I don't know of any ๐
So your ideal solution he hybrid? Part of the network to be ethernet and part wireless? For example, ZigBee?
I don't have the kind of budget you're talking about... my ideal solution would be very different than yours 
That said, if you want smart bulbs then yes, you'll need a hybrid setup, but if you do that you're back to having HA as central to it working
And can I decentralize control through Home Assistant?
That's very much the point of HA
It's the "hub" for a few thousand different platforms, allowing you to treat them all as one big happy system
Yeah, I understand that. But I'm tempted to have a Master HA and a Slave HA.The Slave HA's job is just to monitor whether the Master HA is online and continuously copy its settings. If the Master HA goes down, the Slave HA takes over control of the home without fail. But I guess there is no such solution yet :)?
Well, you could search the forum for High Availability Home Assistant but there's nothing off the shelf
That said, unplanned outages are usually a hardware issue, not a HA issue. Or because you did something wrong.
If you're experienced in running a clustered environment it shouldn't be hard to run a pure Container install that way
If you're not experienced in that, it's not going to be easy
Thanks for the discussion and your time.
Good luck in finding a solution 