Juniper EX9214 Hardware Manual page 211

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When the switch boots from the storage media (removable media, CompactFlash card, or hard disk) it
expands its search in the /config directory of the routing platform for the following files in the following
order: juniper.conf (the main configuration file), rescue.conf (the rescue configuration file), and
juniper.conf.1 (the first rollback configuration file). When the first configuration file is found that can be
loaded properly, the search ends and the file is loaded. If none of the file can be loaded properly, the
routing platform does not function properly. If the switch boots from an alternate boot device, Junos OS
displays a message indication this when you log in to the switch.