OSPF v3 is a redesign of OSPF v2 which adds support for a generic address family. Up to now, only the IPv6 address family has been defined. The OSPF v3 protocol is described in RFC 2740. It inherits most of the OSPF v2 mechanisms (Flooding, DR, LSU,…) with little changes.

In OSPF v3, router-id has the same format as OSPF v2, new and modified LSAs have been created to handle the flow of IPv6 addresses and prefixes in an OSPF v3 network. The new LSAs introduced in OSPF v3 are the Link LSA, and the Intra-Area-Prefix LSA.