Hi,
I had one strange situation where while performing RSP switchover i
completely lost data plane.
SSO/NFS enabled on router, NSF enabled on neighboring routers.
Cisco Version 15.3(3)S6
show ip ospf
Non-Stop Forwarding enabled
    Global RIB has not converged yet <<---- ???
 IETF NSF helper support enabled
 Cisco NSF helper support enabled
thanks for help