Configuring the JUNOS Software

The router is shipped with the JUNOS software preinstalled and ready to be configured when the router is powered on. There are three copies of the software: one on a CompactFlash card (if installed) in the Routing Engine, one on the hard disk in the Routing Engine, and one on a PC card that can be inserted into the slot in the Routing Engine faceplate.

When the router boots, it first attempts to start the image on the PC card. If a PC card is not inserted into the Routing Engine or the attempt otherwise fails, the router next tries the CompactFlash card (if installed), and finally the hard disk.

You configure the router by issuing JUNOS command-line interface (CLI) commands, either on a console device attached to the CONSOLE port on the craft interface, or over a telnet connection to a network connected to the MGMT port on the craft interface.

Gather the following information before configuring the router:

• Name the router will use on the network
• Domain name the router will use
• IP address and prefix length information for the Ethernet interface
• IP address of a default router
• IP address of a DNS server
• Password for the root user

This procedure connects the router to the network but does not enable it to forward traffic. For complete information about enabling the router to forward traffic, including examples, see the JUNOS software configuration guides.

To configure the software:

1. Verify that the router is powered on, as described in Powering On an AC-Powered Router.
2. Log in as the root user. There is no password.
3. Start the CLI.
   root# cli
   root@>
4. Enter configuration mode.
   cli> configure
   [edit]
   root@#
5. Configure the name of the router. If the name includes spaces, enclose the name in quotation marks (“ ”).
   [edit]
   root@# set system host-name host-name
6. Configure the router’s domain name.
   [edit]
   root@# set system domain-name domain-name
7. Configure the IP address and prefix length for the router’s Ethernet interface.
   [edit]
   root@# set interfaces fxp0 unit 0 family inet address address/prefix-length
8. Configure the IP address of a backup router, which is used only while the routing protocol is not running.
   [edit]
   root@# set system backup-router address
9. Configure the IP address of a DNS server.
   [edit]
   root@# set system name-server address
10. Set the root authentication password by entering either a clear-text password, an encrypted password, or an SSH public key string (DSA or RSA).
    [edit]
    root@# set system root-authentication plain-text-password
    New password: password
    Retype new password: password

    or

    [edit]
    root@# set system root-authentication encrypted-password encrypted-password

    or

    [edit]
    root@# set system root-authentication ssh-dsa public-key

    or

    [edit]
    root@# set system root-authentication ssh-rsa public-key
11. Optionally, display the configuration to verify that it is correct.
    [edit]
    root@# show

    system {

    host-name host-name;

    domain-name domain-name;

    backup-router address;

    root-authentication {

    authentication-method (password | public-key);

    }

    name-server {

    address;

    }

    }

    interfaces {

    fxp0 {

    unit 0 {

    family inet {

    address address/prefix-length;

    }

    }

    }

    }

12. Commit the configuration to activate it on the router.
    [edit]
    root@# commit
13. Optionally, configure additional properties by adding the necessary configuration statements. Then commit the changes to activate them on the router.
    [edit]
    root@host# commit
14. When you have finished configuring the router, exit configuration mode.
    [edit]
    root@host# exit
    root@host>