when you disconnected, you can't do anything
no reload or reboot
no write mem
here how it work in Aruba
1. save current config as TODAY
2. set job to rollback within 1hr and count 1 (count 1 mean just run 1 time)
3. do any configuration changes within 1 hr
4. if finish in less than 1 hr then do cancel rollback job
switch will revert to TODAY config even though you disconnected
in Juniper even simpler
https://www.dummies.com/programming/networking/juniper/how-to-confirm-your-junos-configuration-befor...