RB850G and VPLS, as I do if Max L2MTU is 1506?

I bought a RB850G and must use VPLS, as I do if Max L2MTU is 1506?

Ticket#2014101766000078

Still no response from mikrotik team.
RB850G Max L2MTU 1506.jpg

Yes

http://forum.mikrotik.com/t/problem-with-mount-point/94/1