Hitachi GR2000 Series Installation Manual page 272

4.9.1 Connection with IPv6 Router
Pay attention to the following when connecting this router and other equipment by
IPv6 routing.
4.9.1.1 Interface Address of Point-to-Point Type Line
This router handles the path information (direct-coupled path) of a point-to-point
type line as two host paths. Therefore, in a network consisting of only this router,
the interface addresses below can be allocated to the point-to-point type line. Do not
use the point-to-point type line between this router and other equipment.
An IPv6 address with the same prefix can be allocated to multiple point-to-point
type lines.
(For more details, see "Application Guide".)
An IPv6 address with a different prefix can be allocated to both ends of a
point-to-point type line.
(For more details, see "Application Guide".)
However, the intensive setting of path information is complicated when the addresses