The load command in Junos OS provides several operational methods for importing configuration data into the candidate buffer. When an administrator needs to perform a " clean slate " update—where the objective is to completely replace the existing candidate configuration with a new hierarchical file—the override option is the correct tool. Unlike load merge, which blends new data with the existing configuration, or load replace, which only updates specifically tagged sections, load override discards every statement currently in the candidate configuration and substitutes it entirely with the new content.

Using the terminal keyword in conjunction with override allows the architect to paste a large hierarchical configuration directly into the Command Line Interface (CLI). This is the most efficient method for applying validated templates, restoring full system backups, or migrating configurations between devices without having to manually delete existing parameters. After the data is pasted and the process is finalized (typically with a Ctrl+D sequence), the Junos OS kernel validates the new candidate configuration against the device ' s hardware and software capabilities. To make these changes active and operational, a subsequent commit command must be executed. This comprehensive replacement mechanism ensures configuration integrity by eliminating any potential remnants of previous, unwanted settings that might conflict with the new deployment.