Junos® OS For Dummies®, 2nd Edition

Using the System Software

A key part of operating your device is managing and maintaining the system software itself, including the upgrade to new Junos OS releases.

Restarting and requesting system-wide functions

Operational mode provides commands for restarting and resetting individual processes as well as rebooting the device and upgrading its system software.

• Restart: Allows you to restart most Junos processes within operational mode. Junos is a modular operating system (see Chapter 1) whereby independent processes run in their own protected memory space. As such, these processes (called daemons) can be independently managed.
• Request: A set of commands that you can use to perform system-wide functions such as rebooting, upgrading, and shutting down the device. This group also provides you with the ability to put individual components online, take them offline, and restart them without having to reboot the entire device.

Although a process runs independently in the operating system, take special care when using the restart command. For example, a restart of the SNMP process is only disruptive to SNMP, but a restart of routing could have drastic consequences in your network by disrupting and resetting its routing paths.

To restart a specific routing protocol, such as OSPF (see ...