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  • 1.  Downgrade Fail on EX Switch

    Posted 04-01-2020 16:12



    I manage several EX series switches. I have been working on getting these to JTAC recommended versions.

    This includes a few EX2200's. They're mostly running 15.1, but I have been slowly moving them to 12.3.


    Most of these downgrades are completely fine. I install the update and schedule a reboot.

    However, two of them are being difficult. I install Junos 12.3, which appears successful. I then reboot the switch, which takes over 30 minutes (abnormal even for these little switches).


    After the reboot, they're still running 15.1, and I can't figure out why.


    Does anyone have any suggestions on what I can try next?

  • 2.  RE: Downgrade Fail on EX Switch
    Best Answer

    Posted 04-01-2020 18:34

    Hi Luke.


    I hope you're doing great.

    I have seen such failure due to the login password format sha512 . since it is not supported in Junos 12.
    If you currently have that configuration please change it to sha1 or md5.


    I am guessing that you got any kind of warning like this :

    Validation failed
    ERROR: Current configuration not compatible with /var/tmp/jinstall-ex-2200-12.3R12-S12-domestic-signed.tgz
    WARNING: Current configuration not compatible with /var/tmp/jinstall-ex-2200-12.3R12-S12-domestic-signed.tgz.


    If that knob is not the culprit definitely there is something else in the current conf not supported in code 12. 

    For your reference check the link below :



    If this solves your problem, please mark this post as "Accepted Solution" so we can help others too.


    Kind regards.

  • 3.  RE: Downgrade Fail on EX Switch

    Posted 04-01-2020 19:51

    Looks like you're on to something!

    I will try to downgrade overnight, and let you know how it goes

  • 4.  RE: Downgrade Fail on EX Switch

    Posted 04-02-2020 13:10

    Yep, that was it! They've now been downgraded.