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  • 1.  QFX5100 GigabitEthernet (SFP-T) LED Status and Chassis hardware absent.

    Posted 10-28-2020 06:39

    Hello.

     

    On qfx5100-48s switch LED status and Chassis hardware status absent after upgrade JunOS starting from version 19.

     

    For example, with version 18.1R3-S6.1 - LED Status is blinking and "show chassis hardware" show the "Xcvr 7 NON-JNPR MTC230307WR SFP-T". After upgarde to version 19 or 20 - LED light is off, and "show chassis hardware" show nothing, but interface work properly.

     

    Is there a solution to the problem?



  • 2.  Betreff: QFX5100 GigabitEthernet (SFP-T) LED Status and Chassis hardware absent.

     
    Posted 10-28-2020 06:51

    Hello,

     

    it seems that your SFP-T with the S/N MTC230307WR is not a Juniper original SFP-T. 3rd party transceivers can work, but it is not guaranteed that they work. Sometimes there is some code change in newer JUNOS releases which prevent 3rd party transceivers to work. What sounds quite strange is that your interface works fine, but the transceiver is not showing up in the "show chassis hardware" output, this is almost impossible.

     

    My personal experience is, that only original Juniper copper SFPs are working fine with Juniper devices (in contrary to fiber SFPs), 3rd party copper SFPs have huge problems.

     

    If you want to check which Juniper copper SFPs are supported, you can find the full list here:

    https://apps.juniper.net/hct/product/?prd=QFX5100



  • 3.  Betreff: QFX5100 GigabitEthernet (SFP-T) LED Status and Chassis hardware absent.

     
    Posted 10-28-2020 07:04
    pestov82@gmail.com looks like something changed in 19.x/20.x code to make the recognition of the 3rd party SFP no longer be recognized.  Just FYI, there should be no Junos code that 'disallows' any SFP (Juniper or 3rd party) from not working.  Not recognized is one thing, not working is another.  At same time Juniper does not guarantee any operation using 3rd party optics.
     
    Options are as I see it:
     
    1.  Leave as is, as appears to be working, except for recognition.
    2.  Go back to manufacturer of Optic, and get them to change internal programming of their optic to work with Junos 19.x/20.x.  There would be no-guarantee (from Juniper) that this will still work as desired come 21.x+ SW.  Don't bother opening Juniper case, TAC does not work on 3rd party optic situations, like this one.
    3.  Go back to older code.
    4.  Purchase Juniper branded optics.  Work with local partner/Juniper sales team get price closer to what you pay for 3rd party optics, which I assume is reason you went 3rd party in first place.
     
    Good luck.