Description 1
The value of tmnxOspfCfgNbrStorageType specifies the storage type for this conceptual row. Conceptual rows having the value 'permanent' need not allow write-access to any columnar objects in the row. Manually configured entries will have a storage type of nonVolatile while entries dynamically created as a result of a lower-level protocol such as Inverse Neighbor Discovery will have a storage type of volatile. This object is obsoleted in release 16.0.
Sources for this description
Nokia networking MIB copies (LibreNMS/Observium Community)