Junos OS

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  • 1.  Question on Firmware Upgrade

    Posted 06-12-2024 04:41


    When I upgrade a Juniper router using the "request system software ..." command, is the PFE firmware also upgraded?

    Many thanks,


  • 2.  RE: Question on Firmware Upgrade

    Posted 06-13-2024 08:50
    Edited by Olivier Benghozi 06-13-2024 08:55

    The software running on each card (PFE) is actually «upgraded» each time the PFE boots ; actually it downloads its own software from the routing engine at each PFE boot if there's a mismatch.

    So not specially / not only when you upgrade the main JunOS.

    Therefore if you upgrade JunOS and reboot, all the cards softwares are upgraded at the first reboot following the JunOS install. Actually you install the JunOS, you reboot, JunOS gets installed and reboots again the RE to the new version without activating the forward plane, and during this new reboot the PFE are activated and upgrade themselves ; so the «control-plane inside the forward plane / the PFEs» boots twice in this case during the first – but actually the second – reboot :)

    And therefore, a reboot after install will be much slower than a reboot without upgrading anything. And for a card change inside a running chassis, the card may be much slower to start for the first time (because it self updates first).

    Olivier Benghozi

  • 3.  RE: Question on Firmware Upgrade

    Posted 06-13-2024 11:59

    Sometimes a general firmware update to an EX switch also includes a POE unit update, but, you need to run a separate command to actually have it install the POE update; it does not happen as part of the main firmware update.  So after you've booted into a new firmware version, you can run 

    show poe controller

    to see if it has any POE updates. If so, I think the onscreen text has instructions for how to apply that. (Sorry, been a while since we've had any, so I don't recall the exact details)

    Steve Bohrer
    Emerson College IT

  • 4.  RE: Question on Firmware Upgrade

    Posted 06-13-2024 12:55
    Edited by Olivier Benghozi 06-13-2024 12:56

    True, what is not self-updated after JunOS update or reboot are some RE real firmwares/ROM (RE BIOS, RE SSD Firmwares...)... and PoE firmware in EX.

    But not all, as some firmwares on cards are updated by example :D

    Olivier Benghozi