The value of tmnxOspfMulticastImport specifies whether OSPF
protocol will submit routes into the multicast Reverse Path
Forwarding(RPF) Route Table Manage(RTM).
When tmnxOspfMulticastImport has a value of 'true', OSPF protocol
submits routes into the multicast RPF RTM and when it has a
value of 'false', it does not.