Global addresses are not used by Enhanced Interior Gateway Routing Protocol version 6 (EIGRPv6) to form neighbor relationships. Only link-local addresses are used by EIGRPv6 to form neighbor relationships.
EIGRPv6 is also referred to as EIGRP for IPv6. To enable EIGRPv6 on a router, you should issue the ipv6 router eigrp asnumber command in global configuration mode, where asnumber is the autonomous system (AS) number, and then issue the no shutdown command in router configuration mode to start the routing process. If no IPv4 or IPv6 addresses are configured on the router, you must also issue the routerid id command in router configuration mode to manually configure a router ID, where id is a 32bit value similar to an IPv4 address.

Fo a neighbor relationship to form between two routers running EIGRP for IPv4, the primary IP address of each router must be on the same subnet; EIGRP will not form a neighbor relationship over a secondary IP address. However, EIGRPv6 does not require that neighbors be in the same subnet to form a neighbor relationship. Linklocal addresses are significant only on the local link, so EIGRPv6 routers must share a common medium. Therefore, it does not matter whether the linklocal addresses are on the same subnet or not.