current version 7.6
BGP ECMP doesn’t work, all BGP attributes are the same, any ideas?
It is not supposed to work. BGP elects only one best route. BGP multipath is additional feature that is not implemented yet.
in this topic you can see that it works(but the soft version in 7.5)
http://forum.mikrotik.com/t/how-to-disable-ecmp-on-bgp/160663/1
In that topic ECMP is not the result of BGP best path selection.
You can get ECMP by running bgp on a loopbacks recursively resolved over ECMP, or by running two BGP instances, but then best path selection will not work.
As I already mentioned BGP multipath is not implemented and was not implemented in v7.5 too.