[DRW_]

Back when I was a briefly a network engineer at the start of my career, on cisco equipment we'd do 'reload in 5' before big changes - so it'd auto restart after 5 minutes unless cancelled.

I'm sure there were and are better ways of doing it, but it was simple enough and worked for us.

[kazen44]

most ISP tier routers have an entire commit engine to load and apply configs.

junipers allows for instance, one to do the command commit confirmed, which will apply the configuration, and revert back to the previous version if one does not acknowledge this command within a predifined time. this prevents permanent lockout out of a system.