Hello Manfred,
Are you asking about two OSPF processes on the same device, or on two different devices?
Although I do not work with NX-OS, by definition, two separate OSPF processes on the same device never share their data. The only instance of route flow from one process to another is when you configure redistribution from one OSPF process into the other.
On the contrary, on two distinct devices, an OSPF process on one device can communicate with a different OSPF process on another device just fine, as the process number (or name, if NX-OS supports that) is never exchanged with a neighbor.
Best regards,
Peter
