Before you enable OSPF for IPv6 on an interface, you should have an OSPF network strategy planned for your IPv6 network. For example, you must decide whether multiple areas are required.

On the routers on which you want to use OSPFv3 you need to have IPv6 unicast routing enabled and IPv6 address must be configured on the interfaces taking part in the routing process(es).

For the minimum required IOS version for features related to OSPFv3 routing please refer to:
http://www.cisco.com/univercd/cc/td/doc/product/software/

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