This is a key feature of Junos on Juniper devices. It's called 'commit confirmed' and it will apply the config and then auto-rollback if you don't confirm it wi

This is a key feature of Junos on Juniper devices. It's called 'commit confirmed' and it will apply the config and then auto-rollback if you don't confirm it within a certain amount of time. https://www.juniper.net/documentation/us/en/software/junos/cli/topics/topic-map/junos-configuration-commit.html https://www.juniper.net/documentation/us/en/software/junos/c... But Facebook's network is certainly much more complex and automated than just doing one commit on one device. But I think they do still uses Juniper devices at the edge.