Juniper MX2020 Hardware Manual page 372

18. When you have finished configuring the router, exit configuration mode.
[edit]
root@host# exit
root@host>
NOTE: To reinstall the Junos OS, you boot the router from the removable media. Do not insert
the removable media during normal operations. The router does not operate normally when it
is booted from the removable media.
When the router boots from the storage media (removable media, or CompactFlash card) 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 search finds the first configuration file that can be loaded
properly, the file loads and the search ends. If none of the files can be loaded properly, the router platform
does not function properly. If the router boots from an alternate boot device, the Junos OS displays a
message indicating this when you log in to the router.
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