Why is my eero Pro network creating a unique local IPv6 subnet?

I just deployed a network of 4 eero Pro devices with IPv6 support. My ISP delegates a 64-bit subnet to the router, and all of my devices properly create stateless addresses on this subnet (for example, 2600::/16). As expected, devices also create link-local addresses on the fe80::/64 subnet.


With the eero Pro router, devices are also creating unique local addresses on the fd00::/8 subnet. This is unique to eero; when connected to other routers, these same devices only create the link-local and 2600::/16 addresses. Why is the eero Pro advertising this subnet, and for what are these addresses being used?

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