Tools for Accessing and Controlling the Software

The primary means of accessing and controlling the JUNOS software is the CLI.

The router provides three ports on the craft interface for connecting external management devices to the Routing Engine and the JUNOS Internet software:

• Console port—Connects a system console using an RS-232 serial cable.
• Auxiliary port—Connects a laptop or modem using an RS-232 serial cable.
• Ethernet management port—Connects the Routing Engine to a management LAN (or any other device that plugs into an Ethernet connection) for out-of-band management of the router. The Ethernet port is 10/100 Mbps autosensing and requires an RJ-45 connector.

The CLI is the interface to the JUNOS software that you use whenever you access the router from the console or through a remote network connection. The CLI provides commands that perform various tasks, including configuring the JUNOS software, and monitoring and troubleshooting the software, network connectivity, and the router hardware.

The CLI is a straightforward command interface. You type commands on a single line, and the commands are executed when you press the Enter key. The CLI provides command help and command completion; it also provides Emacs-style keyboard sequences that allow you to move around on a command line and scroll through a buffer that contains recently executed commands.