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.