Junos cli

The command line interface of Junos operating system is very unique. It is hierarchy based and is very easy to use. The CLI of Junos contains two different modes; operational and configuration. This symbol signifies operational mode.

How to Control the Command Output Display in Junos OS

In operational mode you can do basic things like health check, ping, traceroute, view various settings and logs, monitor and so on.

Commands available in operational mode are The configure command is typed in operational mode to get in configuration mode.

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The command looks like this. The pound symbol signifies configuration mode. This mode gives you power to configure the device. If you are configuring the device then you will spend most of your time in this mode. Then run command is used in configuration mode to run operational mode commands.

For example. In this mode you can set IP address, host name, routing protocols and so on. The edit command is used to navigate down the hierarchy and up command is used to navigate up the hierarchy.

junos cli

For more information log on to Juniper. Menu Menu. The following two tabs change content below. Bio Latest Posts. You can hire him on UpWork.

Most Used Junos Commands

Bipin enjoys writing articles and tutorials related to Network technologies.By Walter J. Goralski, Cathy Gadecki, Michael Bushong. A fundamental trait to understand about Junos OS is that it separates the command-line interface CLI commands into two modes called the operational mode and the configuration mode.

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The former is used for monitoring tasks. The latter is used for configuring a device and network. Operational mode: A set of commands to manage and monitor device operations. For example, you can monitor the status of the hardware and software and perform maintenance tasks, such as upgrading software or managing device files. Configuration mode: A set of commands to set up the device and the network.

The Junos CLI further structures the activities of each mode into a set of hierarchies. The hierarchy of each mode is made up of cascading branches of related functions commonly used together where deeper levels are more and more specific. By logically grouping activities, the Junos CLI provides a familiar, consistent structure for knowing where you are, finding what you want, moving around the interface, and entering commands.

Also, when you are setting up a configuration for a particular aspect of the network, such as its protocols, or verifying or troubleshooting the network, everything is in the same place.

You simply navigate your way to the necessary area of the command tree. He has worked in the networking field for more than 40 years. Cathy Gadecki is coauthor of the first edition of Junos For Dummies.Go to Solution. Shell is mainly used for fetching the details from forwarding engine in Junos architecture. Although if they have sufficient permissions then those users can switch to the shell via the "start shell", "start shell sh" or "start shell csh" commands etc.

Getting Started: A Quick Tour of the CLI

You could also make a user default to ba"sh" or "csh" by setting the hidden configuration knob:. I'm sure that others have their reasons for accessing the shell too. AFAIK, when you add a new user their home directory is created automatically, and I wasn't aware that there was a need to manually create each users home directory; although you can create additional directories etc. Sign In. Global Communities. Community Resources. Turn on suggestions. Auto-suggest helps you quickly narrow down your search results by suggesting possible matches as you type.

Showing results for. Search instead for. Did you mean:. Mohsin Mukadam. Shell Mode in junos CLI. Regards, Mohsin Solved! Message 1 of 5 28, Views. All forum topics Previous Topic Next Topic. Message 2 of 5 28, Views. Regards, Andy. Message 3 of 5 28, Views. Thanks for quick response. I have read somewhere, that "Shell mode is used to create the directories for separate users.

Message 4 of 5 28, Views. Accepted by topic author Mohsin Mukadam. Message 5 of 5 28, Views. Day One Million!By Walter J. Goralski, Cathy Gadecki, Michael Bushong. Together, they provide a powerful management platform for Junos based devices.

The Junos CLI is the starting point to most operator tasks, providing an intuitive, text-based command shell. Most users find the Junos operating system CLI fairly easy to grasp. Many commands are similar to those used by other networking vendors. After looking around the interface for a few minutes, new users begin to find some of the advanced tools provided by the Juniper engineers to make configuring, monitoring, and managing the system easy to do.

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Some familiar tools include the? Among the many intuitive aspects of the CLI are a structured command hierarchy, extensive fail-safe mechanisms that help to catch configuration mistakes and errors, automation tools for speeding and delivering accuracy to your daily operator tasks, and comprehensive online help.

The simplicity of the J-web interface allows users to quickly and easily deploy many Juniper devices in an enterprise network.

CLI Overview

J-web provides a series of quick configuration wizards that simplify device setup and enable real-time network-management service changes and upgrades. J-web provides access to the configuration statements supported by the device, so you can fully configure it without using the CLI editor. He has worked in the networking field for more than 40 years.

Cathy Gadecki is coauthor of the first edition of Junos For Dummies.By Walter J. Goralski, Cathy Gadecki, Michael Bushong.

To enter configuration mode, use the configure command at the operational mode prompt:. This allows you to create or edit the candidate configuration. Enter set?

junos cli

These top-level groups organize all Junos configuration statements into hierarchies of related commands. You use these top-level commands and their underlying hierarchies to set up the various properties of your device.

You can enter them into the candidate configuration line by line, copy them as text, or import them from a file. To add a new Gigabit Ethernet interface you would directly enter the appropriate set command via the CLI:.

You can use Junos automation to strictly guide users in making changes to a configuration. By creating an op script for the device, users can perform controlled configuration changes based on supplied input from command-line arguments, interactive prompts, or Junos show commands.

The advantage of this approach is that you can code the structure of the change into the script itself. This mitigates human error and lets users with less expertise change the configuration in controlled ways. He has worked in the networking field for more than 40 years. Cathy Gadecki is coauthor of the first edition of Junos For Dummies.By Walter J. Goralski, Cathy Gadecki, Michael Bushong.

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For example, you can request output in different formats, specify how to show moreand pipe the output to display exactly what you want. The Junos operational mode show commands commonly include these display options: tersebriefdetailand extensive where the commands are listed from the least to the most displayed output. You can use these options to adjust the show output listings according to what you need. For example, compare the output when adding terse and brief to the following show interfaces command:.

Pipe is among the most powerful command tools in Junos. With this command tool, you can select a specific subset of output in a single command step.

junos cli

Let Junos do the work by giving you just the output you want. In Junos, both operational and configuration mode commands include options for using pipe to modify the output. The key to understanding pipe is to remember that the output of the command to the left of the pipe symbol serves as input to the command or file to the right of the pipe.

The power of pipe to combine commands creates its superb utility. You can query the CLI to find valid ways to pipe a command. A few examples from a configured device are the best way to learn about pipe in operational mode. The most common ways to use the pipe symbol is to constrain the output using matchexceptfindor last :. You can also use pipe with show commands to change the type of output. For example, count gives the number of lines in the output:. You can use more than one pipe character in a single command.

For example, you can determine the total number of configured Fast Ethernet interfaces with the following command:. He has worked in the networking field for more than 40 years. Cathy Gadecki is coauthor of the first edition of Junos For Dummies.Configuring a Routing Protocol. The following topics can help you get started with the Junos OS CLI to perform configuration changes, switch between operational mode and configuration mode, create a user account, and execute some of the basic commands.

The related topics listed at the end of this topic provide more detailed information about using the CLI. Before you begin, make sure your device hardware is set up and Junos OS is installed. You must have a direct console connection to the device or network access using SSH or Telnet.

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If your device is not set up, follow the installation instructions provided with the device before proceeding. Later, when you enter configuration mode, the prompt will change to. If you are using the root account for the first time on the device, remember that the device ships with no password required for root, but the first time you commit a configuration, you must set a root password. Root access is not allowed over a telnet session.

Mastering JUNOS JUNOS CLI Modes

To enable root access over an SSH connection, you must configure the system services ssh root-login allow statement. The CLI includes several ways to get help about commands.

This section demonstrates some examples showing how to get help:. When you monitor and configure a device running Junos OS, you may need to switch between operational mode and configuration mode.

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When you change to configuration mode, the command prompt also changes. You can also use keyboard sequences to scroll through a list of recently executed commands.

The following table lists some of the CLI keyboard sequences. They are the same as those used in Emacs. Using Wildcard Characters in Interface Names. This topic describes how to log on to a device running Junos OS using a root account and configure a new user account.

You can configure an account for your own use or create a test account. The [edit] prompt banner shows that you are in configuration edit mode at the top of the hierarchy. The prompt in brackets changes to [edit system login] to show that you are at a new level in the hierarchy.

In Junos OS Release For example, you can have a user account named nathan. However, the username cannot begin or end with a period. When the new password prompt appears, enter a clear-text password that the system can encrypt, and then confirm the new password. Configuration changes are not activated until you commit the configuration. If the commit is successful, a commit complete message appears.

You have successfully used the CLI to view the device status and perform a simple configuration change. For complete information about the commands to issue to configure your device, including examples, see the Junos OS configuration guides. This topic describes some of the basic commands that you can use to enter configuration mode in the command-line interface CLI editor, navigate through the configuration hierarchy, get help, and commit or revert the changes that you make during the configuration session.

When you start the CLI, the device is in operational mode. You must explicitly enter configuration mode. You can use the edit command to simultaneously create a hierarchy and move to that new level in the hierarchy.

You cannot use the edit command to change the value of identifiers. The set command is like edit except that your current level in the hierarchy does not change. Use the rollback command to revert all changes from the current configuration session. When you run the rollback command before exiting your session or committing changes, the software loads the most recently committed configuration onto the device. You must enter the rollback statement at the edit level in the hierarchy.


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