# Persistent Configuration Differences for Merged Policies Through Service Manager

Service Manager can specify whether a component policy attachment is nonvolatile. If the interface where the component policy is attached is volatile, then policy management makes the attachment volatile even when the Service Manager specifies otherwise. A nonvolatile interface can have both volatile and nonvolatile component policy attachments. The merged policy that is created is the merge of all component policies attached at a given attachment point regardless of their volatility. The merged policy and its attachments are always volatile and reconstructed on each reload operation.