iControl:System.ConfigSync.synchronize_configuration()

From the documentation:

Note: This method has been deprecated, because syncing has changed radically with the Centralized Management Infrastructure feature. Please use synchronize_to_group_v2 and synchronize_from_group instead. This method now finds all the device groups of which the local device is a member, and runs synchronize_to_group on those groups. It does not support the sync_flag anymore -- that flag is now ignored. Synchronizes the configurations between the two devices in a redundant system. In the case of cache devices, synchronizes the configurations across the cluster.