The prefix length selected for point-to-point connections was /64. A /64 was chosen because it seems to be the best current practice. It makes the number plan easy because every interface gets a /64. There is no need for a /126, /127 or /128 because address conservation is not a deciding factor with IPv6.

The potential future use of a /127 address space (or other address space) which initially seems to use only minimal address range will not work in the long run. More study material can be found in RFC 3627 [RFC3627].

It is also possible to use /128 on point-to-point links. The drawback here is that in Cisco IOS you need to add a static route to the remote side.

For Switzerland with <PoP>=12 this would give the following prefixes: