Initial Configuration

All the platforms running the Junos OS are shipped with a factory-default configuration. All factory-default configurations allow access using the root account. The root account does not include a password by default. Setting a root password is required before activating any changes to the configuration file. All factory-default configurations also includes system logging, which tracks system events and writes those events to predefined log files. Every Junos devices are designed for specific roles within a network environment and their factory-default configurations are created with those specific roles in mind.

Under certain conditions, you might want to return a device running the Junos OS to its factory-default configuration. We can overwrite the candidate configuration while in configuration mode using the 'load factory-default' configuration and do not forget to issue a 'commit' to activate your changes.

System Halt:
The Junos OS is a multitasking environment. To ensure file system integrity, we should always gracefully shutdown Junos OS. The 'request system halt' command is used to do the task. It also provides options that allows us to schedule the shutdown in a specified number of minutes or at an exact time, to specify the media for which the next boot up operation will use.

Initial Configuration Checklist:
When we receive  a device running the Junos OS from the factory, the Junos OS is pre-installed. Once we power on the device, it is ready to be configured. Junos OS recommends to configure the following items:

• System root-authentication,
• Hostname,
• System services for remote access (Telnet, SSH), and
• Management interfaces and static route for management traffic.

The Junos OS enforces password restrictions. All passwords are required to be no less than six characters and must include a change of case, digits or punctuation.