Loading JunOS on an MX series router

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This procedure works for SRX series devices as well.

Step-by-step:

  • 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@% )
  • Copy the file via one of the following processes:
    • The prepared USB stick:
      • Create a temporary folder and mount the USB drive:
        • 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 /tmp/usb (if you get the message "Operation not permitted", try a different USB drive (i.e. a different manufacturer))
    • Network protocol (secure copy)
      • Search for the interface with show configuration
      • Enter set up mode for interface edit interface {fxp0}
        • If there is already set a interface, delete with delete unit 0 family inet address {ip/subnet}
      • Set up the interface with set unit 0 family inet address {ip/subnet}
        • Be sure to choose a IP wich is not already set in your network!
      • Save the changes with commit and go back to normal prompt with exit
      • Now connect the cable with your computer.
      • Ping in both directions to make sure the connection ready.
      • Go into shell mode (router@%) by entering the following command if you are in operational mode (root>): start shell
      • navigate with cd /var/tmp
      • Start transfer with the command scp username@IP:/var/path/filename.tgz
        • NOTE that the file has to be located in the directory you are referring to!
  • Copy the jinstall file to the local file system:
    • Example: cp /tmp/usb/jinstall-ppc-14.2R7.5-domestic-signed.tgz /var/tmp/
    • Example: cp /tmp/usb/jinstall-ppc-15.1R5.5-domestic-signed.tgz /var/tmp/
  • Unmount the USB drive and unplug it: umount /tmp/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 no-validate /var/tmp/[filename]:
    • The no-validate option skips validation of the current configuration to work with the new JunOS version, which is OK for new, unconfigured machines
    • Example: request system software add no-validate /var/tmp/jinstall-ppc-14.2R7.5-domestic-signed.tgz
    • Example: request system software add no-validate /var/tmp/jinstall-ppc-15.1R5.5-domestic-signed.tgz
    • Example: request system software add no-validate /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
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