How to create a scalable ipv6 LAN?

Question

Network routing

I would like to understand how I can create one or more ipv6 LANs.
In the future, I want to combine these networks and manage routing, the segments will be connected through several VPN tunnels.

I need to distribute Unique-local address (ULA) with something.
HOW?
This is an analogue of "private" addresses. Scope - generally speaking, global (RFC 4193), but no one is obliged to route them on the Internet, so in most cases they will be cut off by the provider, for example. You can assign by analogy with the addresses 192.168..., only now there are many more of them, so the probability of choosing the same ones is much lower.

And then I will need to distribute public IPv6. There are several uplinks from different providers in the locations.

I have different IPv6. Both tunnel and real.

BGP, OSPF and other balancing and aggregation are present)

What to read, the habr has already been read all over.
Where are examples? In addition to Linux / Windows / BSD, there are IBM i and AIX at hand

Answer 1

Just like IPv4: DHCP server, addressing plan, think it over, keep in mind that the minimum network is recommended / 64 if you don’t want to rack your brains later when troubleshooting.

Answer 2

Possible through SLAAC