As you know from my previous posts, I’m trying to find time to gain some Juniper knowledge. During this “quest” I will add here some basic things about how to start working with Juniper devices. For now I know only the basics of Juniper configuration, but I hope that soon you’ll find here some more challenging scenarios.

I have a basic topology that you’ll find below. The scenario is already prepare to have some tasks which suppose integration between Juniper and Cisco environment.

Let’s assume that I did power on the two boxes J1 and J2 and now I’m connected to J1 through a console cable. After the boot sequence I’m left with something like this:

All platforms running the Junos OS have only the root user configured by default, without any password. Let’s introduce that username and see what’s happening:

What I have now in front is actually the shell of the FreeBSD OS. JunOS is based on the FreeBSD OS. If you ever interacted with a Linux based system, then you can run here specific linux commands. For example:

OK, you got my point. To get from the FreeBSD shell to JunOS CLI, you need to enter the following:

What you see now is the Operational Mode. In this mode the user can run basic and troubleshooting commands (like traceroute, ping…). You can get a list of commands using the ? (question mark):

If you want to compare the Operational Mode is somehow like Privilege level 1 under Cisco CLI. Still I have the feeling that Operational Mode offer a wider area of commands and more powerful than Cisco CLI Privilege level 1. I may be mistaken.

All platforms running the Junos OS come with a factory-default configuration. All factory-default configurations
allow access using the root account without any password. Nevertheless to activate a configuration you have first to set the password root password.Factory-default configurations can vary from one platform family to another or even between the different models
within the same platform family.
My default configuration looks like:

I this first post my target is to set the hostname of the Juniper devices. To accomplish this step, I need to go first into configuration mode:

and then set the hostname:

If I look at the system prompt, it still shows root#, so it doesn’t quite seems to work. This is because I have to commit to activate the configuration:

Well, this didn’t work as expected. The most important thing that I learned when I started with Juniper is that before I can activate any configuration (commit) I need to set the password for the root user:

Let me try to commit one more time, after setting the root password:

You can see that the prompt did change into [email protected]# (in my case this is [email protected]#). If you look again to the system configuration. I will exist the Configuration Mode and have another look at my config file:

The host-name and root password appears now in the active configuration.

That’s it for today. Until next post, I will add the basic configuration for J2 and the Cisco, so I can go to basic interface configuration and connectivity check.

Juniper, first steps after power-on the device

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