Can't configure MC-LAG config consistency check

‎09-11-2019 09:51 PM

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!


Re: Can't configure MC-LAG config consistency check

‎09-12-2019 01:40 PM

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.



Accepted by topic author jrb18
‎09-15-2019 02:56 PM

Re: Can't configure MC-LAG config consistency check

‎09-12-2019 02:23 PM



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


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


Re: Can't configure MC-LAG config consistency check

‎09-15-2019 02:58 PM

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.