Failover configuration synchronization for the ephemeral database

When you configure the commit synchronize statement at the [edit system] hierarchy level in the static configuration database of an MX Series Virtual Chassis or dual Routing Engine device, the backup Routing Engine will synchronize both the static and ephemeral configuration databases when it synchronizes its configuration with the primary Routing Engine, for example, when a backup Routing Engine is newly inserted, comes back online, or changes primary role. On a dual Routing Engine system, the backup Routing Engine synchronizes both configuration databases with the primary Routing Engine. In an MX Series Virtual Chassis, the primary Routing Engine on the protocol backup synchronizes both configuration databases with the primary Routing Engine on the protocol primary.