add address= 172.16.0.254/24 network= 192.168.0.0 broadcast= 172.16.0.255 interface= LAN
add address= 192.168.100.100/24 network= 10.111.0.0 broadcast= 192.168.100.0 interface= ISP1
add address= 192.168.200.200/24 network= 10.112.0.0 broadcast= 192.168.100.0 interface= ISP2



/ ip firewall mangle
add chain=prerouting dst-address=192.168.100.0/24  action=accept in-interface=LAN-Bridge
add chain=prerouting dst-address=192.168.200.0/24   action=accept in-interface=LAN-Bridge


add chain=prerouting in-interface=ISP1 connection-mark=no-mark action=mark-connection\ new-connection-mark=ISP1_conn
add chain=prerouting in-interface=ISP2 connection-mark=no-mark action=mark-connection\ new-connection-mark=ISP2_conn

add chain=prerouting  in-interface=LAN-Bridge connection-mark=no-mark dst-address-type=!local\ per-connection-classifier=both-addresses:2/0 action=mark-connection new-connection-mark=ISP1_conn 
add chain=prerouting  in-interface=LAN-Bridge connection-mark=no-mark dst-address-type=!local\ per-connection-classifier=both-addresses:2/1 action=mark-connection new-connection-mark=ISP2_conn


add chain=prerouting connection-mark=ISP1_conn in-interface=LAN-Bridge action=mark-routing\ new-routing-mark=to_ISP1
add chain=prerouting connection-mark=ISP2_conn in-interface=LAN-Bridge action=mark-routing\ new-routing-mark=to_ISP2
add chain=output connection-mark=ISP1_conn action=mark-routing new-routing-mark=to_ISP1     
add chain=output connection-mark=ISP2_conn action=mark-routing new-routing-mark=to_ISP2

add dst-address=0.0.0.0/0 Gateway=192.168.100.1 routing-mark=to_ISP1 check-gateway=ping
add dst-address=0.0.0.0/0 Gateway=192.168.200.1 routing-mark=to_ISP2 check-gateway=ping

add dst-address=0.0.0.0/0 Gateway=192.168.100.1 distance=1 check-gateway=ping
add dst-address=0.0.0.0/0 Gateway=192.168.200.1 distance=2 check-gateway=ping

/ ip firewall nat 
add chain=srcnat out-interface=ISP1 action=masquerade
add chain=srcnat out-interface=ISP2 action=masquerade