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Configuration Task Overview

Use the J-Web user interface to configure the services supported on a routing platform, including system settings, routing protocols, interfaces, network management, and user access.

Alternatively, you can configure the routing platform services with the JUNOS command-line interface (CLI) from a console connection to the routing platform or a remote network connection. You can also access the CLI from the J-Web interface. For more information, see Using the CLI Terminal. For complete information about using the CLI, see the JUNOS CLI User Guide.

Editing and Committing a JUNOS Configuration

When you edit a configuration, you work in a copy of the current configuration to create a candidate configuration. The changes you make to the candidate configuration are visible through the user interface immediately, but do not take effect on the routing platform until you commit the changes.

When you commit the configuration, the candidate file is checked for proper syntax, activated, and marked as the current, operational software configuration file. If multiple users are editing the configuration when you commit the candidate configuration, all changes made by all the users take effect. If you are editing the configuration with the CLI, you can edit an exclusive or private candidate configuration. For more information, see the JUNOS CLI User Guide.

When you commit a configuration, the routing platform saves the current operational version and the previous 49 versions of committed configurations. The most recently committed configuration is version 0 (the current operational version), and the oldest saved configuration is version 49. You can roll back the configuration to any saved version.

Note: You must assign a root password before committing a configuration and can do so on the J-Web Set Up page. (See Sample Task—Configuring Setup with Quick Configuration.)

To better understand the JUNOS configuration process, become familiar with the terms defined in Table 26.

Table 26: JUNOS Configuration Terms

Term	Definition
candidate configuration	A working copy of the configuration that can be edited without affecting the routing platform until it is committed.
configuration group	Group of configuration statements that can be inherited by the rest of the configuration.
commit a configuration	Have the candidate configuration checked for proper syntax, activated, and marked as the current configuration file running on the routing platform.
configuration hierarchy	Set of hierarchically organized configuration statements that make up the JUNOS software configuration on a routing platform. There are two types of statements: container statements, which contain other statements, and leaf statements, which do not contain other statements. All the container and leaf statements together form the configuration hierarchy.
rescue configuration	On J-series routing platforms only, a configuration that recovers a routing platform from a configuration that denies management access. You set a current committed configuration through the J-Web interface or CLI for emergency use. To load and commit the rescue configuration, you press and release the CONFIG or RESET CONFIG button.
roll back a configuration	Return to a previously committed configuration.

J-Web Configuration Tasks

J-Web configuration pages offer you several different ways to configure your routing platform. Configuration pages provide access to all the configuration statements supported by the routing platform, so you can fully configure it without using the CLI. You can also manage the configuration, monitor user access, and set a rescue configuration.

Table 27 provides a summary of the J-Web configuration tasks.

Table 27: J-Web Configuration Tasks Summary

J-Web Configuration Task	Description	More Information
Edit the configuration quickly	Set up, configure, and manage the routing platform quickly and easily without configuring each statement individually.	Using Quick Configuration
Edit the configuration using a clickable interface	Expand the entire configuration hierarchy in the side pane and click a configuration statement to view or edit. The main pane displays all the options for the statement, with a text box for each option.	Edit Configuration (J-Web Configuration Editor)
Edit the configuration in a text format	Paste a complete configuration hierarchy into a scrollable text box, or edit individual lines in the configuration text.	Edit Configuration Text
Upload a configuration file	Upload a complete configuration.	Upload Configuration File
View the configuration in text format	View the entire configuration on the routing platform in text format.	View Configuration Text
Display configuration history	Display the routing platform configuration history and compare, roll back, or download specific versions of the configuration.	Using History
Display users editing the configuration	Display information about all users logged into a routing platform at the same time.	Using History
Set and delete a rescue configuration	On J-series routing platforms, create or delete a rescue configuration.	Using Rescue (J-series Routing Platforms Only)

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