Hi smelnik,
There's an issue fixed on these lines, what's the Junos version on the EX? Please use the JTAC recommended release or one of the following and confirm if that resolves.
17.2R3
18.1R1
17.3R3
17.4R2
18.1R1
17.2R3
17.3R3
17.4R2
18.1X75-D10
18.1X75-D10
16.1R7
15.1R7
16.1R7
14.1X53-D47
15.1X53-D233
15.1X53-D233
17.1R3
17.1R3
This should be documented as follows, I'll check and update this on a public link once you can confirm resolution:
The flexible-ethernet-services/vlan-bridge and vlan-ccc configuration will not work when both are configured together on all the QFX5k platforms and EX4600. Either one of them should be configured and not both.
set interfaces xe-0/0/18 encapsulation flexible-ethernet-services (At physical link layer)
OR
set interfaces xe-0/0/18 encapsulation vlan-ccc
AND
set interfaces xe-0/0/18 unit x encapsulation vlan-bridge (At logical link layer)
OR
set interfaces xe-0/0/18 unit x encapsulation vlan-ccc
It will not throw any commit check error or display a warning message.
Hope this helps.
Regards,
-r.
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Kudos are always appreciated :).