Loading JunOS on an MX series router

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This procedure works for SRX series devices as well.


  • Connect to the router's console as root user (the prompt looks like this: root> )
    • (If, right after login, you already are in shell mode (root@% ) and the exit command will only log you out instead of bringing you into command mode (root> ), you can issue the cli command to get there.)
  • Check the current software version: show version
  • Start a shell session: start shell (the prompt changes to root@% )
  • Create a temporary folder and mount the USB drive:
    • mkdir /mnt/usb (if you get the message "read-only file system", then try mkdir /tmp/usb)
    • Put the jinstall-*.tgz file on a FAT32 formatted USB drive and place it in the router's USB port
    • Watch the message on the screen to find out what device references the USB drive (e.g. da1s1)
      • If mounting da0s1 does not work, try re-seating the USB drive until it appears as da1s1.
    • mount -t msdosfs /dev/da1s1 /mnt/usb (if you get the message "Operation not permitted", try a different USB drive (i.e. a different manufacturer))
  • Copy the jinstall file to the local file system:
    • Example: cp /mnt/usb/jinstall-ppc-14.2R7.5-domestic-signed.tgz /var/tmp/
    • Example: cp /mnt/usb/jinstall-ppc-15.1R5.5-domestic-signed.tgz /var/tmp/
  • Unmount the USB drive and unplug it: umount /mnt/usb
  • Exit the shell session to go back to command mode: exit (the prompt changes back to root> )
  • Install the software with the command request system software add:
    • Example: request system software add /var/tmp/jinstall-ppc-14.2R7.5-domestic-signed.tgz
    • Example: request system software add /var/tmp/jinstall-ppc-15.1R5.5-domestic-signed.tgz
    • Example: request system software add /var/tmp/jinstall-ppc-15.1R6.7-domestic-signed.tgz
  • Reboot the router: request system reboot
  • Check the new software version has been installed: show version