hi i install active directory and Microsoft sccm for remote os deployment.
when i use cisco router and use ip helper for DHCP relay, DHCP and bootp pxe protocol ok.
when i use dhcp relay in mikrotik, dhcp relay is ok but pxe boot not ok.

in cisco: 200.60(active directory), 200.63(sccm)
interface vlan 120
ip helper-address 192.168.200.60
ip helper-address 192.168.200.63

in mikrotik:
/ip dhcp-relay
add dhcp-server=192.168.200.60,192.168.200.63 disabled=no interface=vlan120 \
name=relay1

the client can get ip from 200.6 but can not boot from 200.63.

thanks a lot.