OSPFv2 requires the DR/BDR election to occur on multiaccess networks only, whereas OSPFv3 requires DR/BDR elections for all network types.
Both OSPFv2 and OSPFv3 use the router configuration network command to advertise networks.
*Both OSPFv2 and OSPFv3 use multicast destination addresses for link-state packets.*
OSPFv2 uses a 32-bit router ID and
OSPFv3 uses a 128 bit router ID.