Got it.
/interface bridge
add name=bridge
/ppp profile
add bridge=bridge change-tcp-mss=yes dns-server=8.8.8.8,8.8.4.4 idle-timeout=10m local-address=XX.XX.XX.X name=profile only-one=yes
added 1600 mrru & change interface to bridge in pppoe server also add lan interface to bridge