Operational monitoring and maintenance of JUNOS devices

3. Powering on and shutting down Junos devices

The following are the methods to power on and shut down Junos devices:

1. Power On: To power on a Junos device, plug in the power cord to the device and press the power button.
2. Shut Down: To shut down a Junos device gracefully, log in to the device using the CLI or J-Web interface, and issue the following command: request system halt

This will initiate a clean shut down of the Junos OS process, which will allow any pending writes to be completed and prevent data loss.

3. Reboot: To reboot a Junos device, log in to the device using the CLI or J-Web interface, and issue the following command: request system reboot

This will restart the Junos OS process and reload the configuration.

Note: In case of an emergency or if the device is not responding, the power cord can be unplugged to force a power off. This should be avoided as it can result in data loss and corruption.

4. Root password recovery

The following are the steps to recover the root password on a Junos device:

1. Connect a console cable to the device and power it on.
2. When the device boots, interrupt the boot process by pressing the escape key.
3. In the boot menu, select the option to enter the loader prompt.
4. At the loader prompt, set the console terminal to 9600 baud, 8 data bits, no parity, 1 stop bit, and no flow control.
5. Type the following command to enter the CLI: set console page 0 cli
6. Type the following command to reset the root password: set system root-authentication plain-text-password
7. Enter the new root password and confirm it.
8. Type the following command to save the changes: commit and-quit
9. Type the following command to reboot the device: reboot
10. After the device reboots, log in using the new root password.

Note: The above steps assume a Junos device with a standard configuration. For devices with custom configurations, the steps may vary.