This is the state of this IP Reachable Address, following the ExistenceState and ManualOrAutomatic behaviors. It is the row-creation and deletion control for an individual IP reachability entry, and like its OSI counterpart, deleting an automatically generated entry here may not stick if the underlying redistribution source immediately regenerates it on the next update cycle. For example, setting this to destroy on a manually created static IP reachable address permanently removes that route, but attempting the same on an automatic entry may only remove it until the next redistribution refresh recreates it.