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  • 1.  QFX5200 Virtual Chassis ports

    Posted 10-12-2018 07:10

    Hi Community,


    I am very confused. Here is a switch that is full with 100GE ports, and I can use only the 40GE ports for the VC.

    Can I use QSFP28 ports as Virtual Chassis ports on QFX5200-32C? Or can I only use the QSFP+ ports as VCP ports on QFX5200-32C?

    Can somebody clarify this?


    Thanks, and Best Regards,



  • 2.  RE: QFX5200 Virtual Chassis ports

    Posted 10-12-2018 11:20

    QFX5200 family of products, 32C, 64C or 48y, do not support Virtual Chassis at all, and I believe there may not be any roadmap for such support either.  See:




    HTH and Good Luck.

  • 3.  RE: QFX5200 Virtual Chassis ports

    Posted 10-12-2018 12:56



    Thank you for your answer!

    I have chacked the link and I could not find it either.

    But, based on this: https://www.juniper.net/documentation/en_US/release-independent/junos/topics/reference/requirements/virtual-chassis-qfx-ex-series-hardware-planning.html


    It really seems that only that the 40GE ports can be used as VCP. Can somebody tell me why?


    Thanks in advance!

    Best Regards,




  • 4.  RE: QFX5200 Virtual Chassis ports
    Best Answer

    Posted 10-13-2018 00:52

    Hi rccpgm,


    Virtual-chassis support for QFX5200-32C was introduced in 17.3R2 (https://www.juniper.net/documentation/en_US/junos/information-products/topic-collections/release-notes/17.3/junos-release-notes-17.3.pdf, page 230). It came as a surprise for me as well as I never expected this platform to have VC support.


    @Attila: Regarding VC-ports; I suspect a chipset limitation for the VC-functionality as all documentation states 40G QSFP ports. On the other hand you will still have 80G capacity between the switches. If this isn't enough I suggest you look at MC-LAG instead.


    I will suggest to convert the two ports needed for VC to 40G or look at MC-LAG if you require 100G throughput.

  • 5.  RE: QFX5200 Virtual Chassis ports

    Posted 10-13-2018 01:12

    Jonas thanks for the findings and update.  I never expected this as well, but VC should be there, and this is a good addition.  Need to check as to why support is not there also on 64C and 48y.


    Attila, I am also checking for why 40GE limitation is there.  As Jonas stated could very likely be HW limitation, or potentially test.


    If I find anything out, I'll update this thread.

  • 6.  RE: QFX5200 Virtual Chassis ports

    Posted 10-15-2018 02:59

    Hi Jonas,

    Thank you for your answer!

    It seems wehave to use the MC-LAG.


    Best Regards,



  • 7.  RE: QFX5200 Virtual Chassis ports

    Posted 03-21-2019 07:04

    A short note here... from 17.3R2-S4 you can also use 100G for VC ports. Listed in the bottom off this page:


  • 8.  RE: QFX5200 Virtual Chassis ports

    Posted 04-02-2019 02:36

    Hello Jonas,


    Thank you for your update!

    Your article was very useful.


    Best Regards,

    Attila Horváth