Comment 1 for bug 1356926

I suggest such solution:

1) According to IETF all "not /64" subnets in IPv6 are risky, so no strict reservations should be done for them. Also no need to reserve broadcast address for them as it doesn't exist in IPv6. Subnet-router anycast address makes sense in all networks except of /127, /128:

 A) If network mask is between 64 and 127, reserve only subnet-router anycast address, all others should be allocated for hosts.
 B) If network mask is 127 or 128, don't reserver anything.

2) In all /64 and bigger networks all reservations according to "Interface IID" document should be done: http://www.iana.org/assignments/ipv6-interface-ids/ipv6-interface-ids.xhtml