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Can't configure MC-LAG config consistency check

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  • 1.  Can't configure MC-LAG config consistency check

    Posted 09-11-2019 21:52

    Hi everyone,

    I am trying to configure MC-LAG Configuration Consistency Checking as described here on a QFX5100-24Q-2P running Junos 17.3R3-S4.2. However, I get a syntax error when I try to add the following to my MC-LAG configuration:


    set multi-chassis mc-lag consistency-check



    As expected, I'm also not able to see the state of the MC-LAG config consistency:


    admin@TEST> show multi-chassis mc-lag configuration-consistency
    warning: mc-ae-config-check-service subsystem not running - not needed by configuration.



    I can confirm that the ICCP and ICL-PL links are operating and there is L3 connectivity between both MC-LAG peers.


    Anyone else seeing this problem? Any assistance would be appreciated!

  • 2.  RE: Can't configure MC-LAG config consistency check

    Posted 09-12-2019 13:41

    Feature should be supported as per:



    If you see any core dump when commiting you may want to open a case to further decode or test 17.4R2, there were some MC_lag changes introduced on that version that may solve your problem.



  • 3.  RE: Can't configure MC-LAG config consistency check
    Best Answer

    Posted 09-12-2019 14:24



    This feature is not supported on QFX5100.


    Please refer to the supported platform on the document.


    show multi-chassis mc-lag configuration-consistency mcae-config


    [KUDOS PLEASE! If you think I earned it!

    If this solution worked for you please flag my post as an "Accepted Solution" so others can benefit..]

  • 4.  RE: Can't configure MC-LAG config consistency check

    Posted 09-15-2019 14:58

    Thanks adwivedi, I re-read the "Platforms and Release Support" section on the MC-LAG feature guide, which states that consistency checks are not supported on the QFX5100s.