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QFX5100 upgrade with minimum interruption

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  • 1.  QFX5100 upgrade with minimum interruption

    Posted 04-08-2020 04:13


    We have a VC of 6 QFX5100 switches (2 spines & 4 leafs) all running Junos 14.1X53-D46.7.

    How do you think is the best way to upgrade to Junos 18.1R3-S9 with very minimum intruption. 

    - Is it possible to upgrade mnually directly to 18.x as I heard first I need to upgrade to 17.x thn to 18.x ? 

    - I believe NSSU is not an option for such upgrade as it is not supported for 14.x. 

    - For now I found below approach to devide it to two VCs (each will have 3 switches) and isolate it then mnaually upgrade it, do u suggest a better way? 


    How to Upgrade a Four-Member QFX Series VCF



  • 2.  RE: QFX5100 upgrade with minimum interruption
    Best Answer

    Posted 04-08-2020 08:53

    Hi Alex_Sk,


    Greetings, Stage upgrades where mostly for legacy devices when major changes were introduced like ( jloader etc) this is not applicable for your platform, you can go directly to the code you desire, furthermore the QFX's don't have the configuration validation option so you might want to test this in the lab at least with one spare device to make sure that your configuration will be compliant with the new code( this is the only way you can validate your configuration)  please check below KB: https://kb.juniper.net/InfoCenter/index?page=content&id=TSB17508&cat=&actp=LIST


    Regarding NSSU, my friend, I would not recommend this also NSSU won't work from any 14 code skipping 2 major releases only 14 to 14 or 14 to 15, this will just take more time and you will still have high chances of running into some issues please check: https://www.juniper.net/documentation/en_US/release-independent/junos/topics/reference/general/nssu-qfx5100vcf.pdf


    Divided approach fro the upgrade; I believe that this is the best way to go, if you are more concerned about the downtime and not on all of the steps and the time this would take you to accomplish the upgrade, please note that this will reduce your network capabilities/operation to 50 % since half of your devices will be down at some point ( pushing the code to the file system snd rebooting) at least for 15 to 30 min.

    Make sure that each group of 3 has a RE ( spine device)  and that should be it! good luck!!


    If this solves your problem, please mark this post as "Accepted Solution" so we can help others too \:)/



    Lil Dexx
    JNCIE-ENT#863, 3X JNCIP-[SP-ENT-DC], 4X JNCIA [cloud-DevOps-Junos-Design], Champions Ingenius, SSYB