9.1. Why You Need a CLI
Despite their age, CLIs are still one of the most-requested features for Linux appliances, especially network appliances that will be installed in a server room or network operations center. Let's look in turn at each of the major reasons to have a CLI on your appliance:
Configuration backup and restore
Many service providers will reject an appliance that places its control and status protocol on the same wire as user data; the setup they prefer is an entirely separate physical channel that is dedicated to management of the appliance. Historically, this separate channel has been an RS-232 interface with a CLI on it. The RS-232 lines are routed to the control center ...