This indicates whether the outbound MPLS mapping entry for this pseudowire persists across a reload (nonvolatile) or is lost on restart (volatile), matching the pattern used for the inbound and base VC storage type objects. Confirming this is nonvolatile is part of verifying that a carefully engineered TE-tunnel binding for a premium customer's pseudowire will survive a planned maintenance reload rather than falling back to default LDP signaling. Auditing this alongside cpwVcMplsInboundStorageType catches the case where only one direction of a VC's MPLS mapping was actually saved to nonvolatile storage.