Configuring a Router for the First Time

On most JUNOS routing platforms, the JUNOS software is installed on the CompactFlash card and on the hard disk. When you first turn on a routing platform, it runs the version of the JUNOS software installed on the CompactFlash card. The copy of JUNOS software on the hard disk is a backup. Another backup copy of the JUNOS software is available on removable media, such as a PC Card or a CompactFlash card. Be sure to put the backup JUNOS software (on removable media) in a safe place.

When you turn on a routing platform the first time, the JUNOS software automatically boots and starts. You must enter basic configuration information so that the routing platform is on the network and you can log in to it over the network.

This section provides the procedures for configuring the JUNOS software on a routing platform with either single or dual Routing Engines:

• Configuring the JUNOS Software the First Time on a Router with a Single Routing Engine
• Configuring the JUNOS Software the First Time on a Router with Dual Routing Engines
• JUNOS Software Default Settings That Protect the Router
• Configuring Software Properties
• Activating a Configuration
• Managing Available Disk Space

To configure the routing platform initially, you must connect a terminal or laptop computer to the routing platform through the console port—a serial port on the front of the routing platform. Only console access to the routing platform is enabled by default. Remote management access to the routing platform and all management access protocols, including Telnet, FTP, and SSH, are disabled by default.

When you first connect to the routing platform console, you must log in as the user root. At first, the root account requires no password. You see that you are the user root, because the routing platform command prompt shows the username root@#.

You must start the JUNOS software command-line interface (CLI) using the command cli. The command prompt root@> indicates that you are the user root and that you are in the JUNOS software operational mode. Enter the JUNOS software configuration mode by typing the command configure. The command prompt root@# indicates that you are in the JUNOS software configuration mode.

When you first configure a routing platform, you must configure the following basic properties:

• Routing platform hostname
• Domain name
• IP address of the routing platform Ethernet management interface—fxp0
• IP address of a backup router
• IP address of one or more DNS name servers on your network
• Password for the root account

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