Whether dynamically created entries in the ospfPmNbrTable should be kept when the adjacency goes down. The default value is 'true', which indicates that dynamically created entries in the ospfPmNbrTable will be deleted automatically when the adjacency goes down. If this object is set to 'false', then dynamically created entries in the ospfPmNbrTable will remain with state 'nbrDown' when the adjacency is lost. Such entries can be deleted manually by setting ospfPmNbrStatus to 'destroy'.