What command allows you to move all configurations from a faulty interface to an unused one on the same device?

The correct command to move all configurations from a faulty interface to an unused one on the same device is indeed "replace pattern." This command is designed to facilitate the migration of configurations between interfaces, allowing for a smooth transition when one interface becomes faulty.

In Junos OS, the "replace pattern" command can be utilized to search for a specific configuration pattern—such as an interface that is currently faulty—and then apply that configuration to another, unused interface. This method streamlines the process, enabling network engineers to avoid potential issues related to manual configuration and ensuring that the new interface can be brought into service quickly with all necessary settings intact.

Using this command effectively reduces downtime and helps maintain network integrity by ensuring that the new interface is ready to take over the responsibilities of the faulty one without the need for extensive reconfiguration. Understanding how to use "replace pattern" in these scenarios is essential for network operations, particularly in maintaining high availability and reliability in network infrastructures.