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Router configuration software1/2/2023 ![]() The base prompt has the format When you are in operational mode, the prompt ends with a > when you are in configuration mode, the prompt ends with a On the router, you can identify which mode you are in by looking at the CLI prompt. Throughout the rest of this book, we’ll show you how to work in both modes as you configure the router and verify its operation. ![]() It is important for you to understand the differences between these two modes, what types of actions you can take in which mode, and how to keep track of which mode you are working in. In configuration mode, the commands let you define the behavior of the router, such as indicating what network addresses to use and protocols to run. In operational mode, you monitor everything about the router’s hardware and software and check on network operation. The CLI has two modes: operational mode and configuration mode. If you are already familiar with the FreeBSD or Unix equivalent, this will help you understand the JUNOS command. As we talk about the various CLIĬommands, if a command is derived from FreeBSD or a standard Unix utility, or is simply the FreeBSD or Unix command packaged with a JUNOS name, we will mention the command it is based on. For complete information about the JUNOS CLI, refer to the JUNOS product documentation on the Juniper Networks web site. Throughout the rest of this chapter, we’ll give more examples of CLI features. While it is beyond the scope of this book to describe the design of the CLI and all its capabilities, this section gives an overview of the CLI modes and describes a few of the basic features. Throughout this book, we’ll show you how to use the JUNOS CLI to configure and monitor the router. From J-Web, the configuration is saved in an ASCII file that you can read using J-Web, the CLI, or an ASCII text editor. From the CLI, you specify the configuration in a plain-text (ASCII) configuration file, which you can read from the CLI (on the router) or by using any ASCII text editor (on a server). Some routers, including the J-series, also have a web-based interface called J-Web. To configure the router, you generally log in to the router and use the JUNOS CLI. You then configure the desired software features. When you first start a router, you must configure basic network information, such as the router name, IP address, and domain name, so that the router is reachable on the network. It also discusses how to upgrade the JUNOS software and how to gather hardware and software inventory information. This chapter discusses basic router configuration, including how to configure the router for the first time, configuring from the command-line interface (ĬLI), loading and saving configuration files, and working with the filesystems and files used by the JUNOS software. The examples in this book are based on the JUNOS 7.4 release of the software on either M20 routers or J2300 routers, but all are applicable for the most recent JUNOS releases and for future releases on the M-, T-, and J-series families of routers. A given JUNOS software release runs on all J-series, M-series, and T-series routers. JUNOS software is distributed as a set of modular software packages that contain the various components of the software. The first task you have to perform is configuring the router. The JUNOS software is pre-installed on a new Juniper Networks routers: when you turn the router on, the software automatically starts running. The J-series routers are smaller routers designed for use by businesses and other organizations to connect multiple sites or to connect to the Internet. The M-series and T-series platforms are larger routers typically used by network service providers, telephone companies, large enterprise companies, and universities. ![]() In this book, we talk about JUNOS features that run on the J-series, M-series, and T-series router platforms. Routers are specialized network devices that run network operating system software, which is called JUNOS software.
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