Loading JunOS on an MX series router

2023-05-11T14:42:05Z

Delia:

This procedure works for SRX series devices as well.

* For reference: see Juniper knowledge base: https://kb.juniper.net/InfoCenter/index?page=content&id=KB11409
Step-by-step:
* Connect to the router's console as ''root'' user (the prompt looks like this: <code>root> </code>)
** (If, right after login, you already are in shell mode (<code>root@% </code>) and the <code>exit</code> command will only log you out instead of bringing you into command mode (<code>root> </code>), you can issue the <code>cli</code> command to get there.)
* Check the current software version: <code>show version</code>
* Start a shell session: <code>start shell</code> (the prompt changes to <code>root@% </code>)
*Copy the file via one of the following processes:
** The prepared USB stick:
*** Create a temporary folder and mount the USB drive:
**** <code>mkdir /tmp/usb</code>
**** Put the <code>jinstall-*.tgz</code> 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. <code>da1s1</code>)
***** If mounting <code>da0s1</code> does not work, try re-seating the USB drive until it appears as <code>da1s1</code>.
**** <code>mount -t msdosfs /dev/da1s1 /tmp/usb</code> (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 <code>edit interface {fxp0}</code>
**** If there is already set a interface, delete with <code>delete unit 0 family inet address {ip/subnet} </code>
*** Set up the interface with <code>set unit 0 family inet address {ip/subnet}</code>
**** 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 <code>exit</code>
*** 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>): <code>start shell</code>
*** navigate with <code>cd /var/tmp</code>
*** Start transfer with the command <code>scp username@IP:/var/path/filename.tgz</code>
**** NOTE that the file has to be located in the directory you are referring to!
* Copy the <code>jinstall</code> file to the local file system:
** Example: <code>cp /tmp/usb/jinstall-ppc-14.2R7.5-domestic-signed.tgz /var/tmp/</code>
** Example: <code>cp /tmp/usb/jinstall-ppc-15.1R5.5-domestic-signed.tgz /var/tmp/</code>
* Unmount the USB drive and unplug it: <code>umount /tmp/usb</code>
* Exit the shell session to go back to command mode: <code>exit</code> (the prompt changes back to <code>root> </code>)
* Install the software with the command <code>request system software add no-validate /var/tmp/[filename]</code>:
** 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: <code>request system software add no-validate /var/tmp/jinstall-ppc-14.2R7.5-domestic-signed.tgz</code>
** Example: <code>request system software add no-validate /var/tmp/jinstall-ppc-15.1R5.5-domestic-signed.tgz</code>
** Example: <code>request system software add no-validate /var/tmp/jinstall-ppc-15.1R6.7-domestic-signed.tgz</code>
* Reboot the router: <code>request system reboot</code>
* Check the new software version has been installed: <code>show version</code>

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Loading JunOS on an MX series router