Config made according to:
https://wiki.mikrotik.com/wiki/Manual:C ... _Mirroring

Initialy it was tested on some RouterOS 6.41rc__ and was very promising, but in reality - until version 6.42.4 it works for just a few minutes from system startup.
Starting from version 6.42.5 work time is even less then 1 minute.
This feature is broken.

Or there should be used some other undocumented yet config ?