Lihat sumber Load Balancing MikrotikMetode Pcc

 /ip firewall nat
 add action=masquerade chain=srcnat out-interface=ether1-ISP-1
 add action=masquerade chain=srcnat out-interface=ether2-ISP-2


 /ip firewall mangle
 add action=mark-connection chain=prerouting connection-mark=no-mark \
    in-interface=ether1-ISP-1 new-connection-mark=isp-1 passthrough=yes
 add action=mark-connection chain=prerouting connection-mark=no-mark \
    in-interface=ether2-ISP-2 new-connection-mark=isp-2 passthrough=yes
 add action=mark-connection chain=prerouting connection-mark=no-mark \
    in-interface=ether3-swicth new-connection-mark=isp-1 passthrough=yes \
    per-connection-classifier=both-addresses-and-ports:2/0
 add action=mark-connection chain=prerouting connection-mark=no-mark \
    in-interface=ether3-swicth new-connection-mark=isp-2 passthrough=yes \
    per-connection-classifier=both-addresses-and-ports:2/1
 add action=mark-routing chain=prerouting connection-mark=isp-1 in-interface=\
    ether3-swicth new-routing-mark=KE_ISP1 passthrough=yes
 add action=mark-routing chain=prerouting connection-mark=isp-2 in-interface=\
    ether3-swicth new-routing-mark=KE_ISP2 passthrough=yes
 add action=mark-routing chain=output connection-mark=isp-1 new-routing-mark=\
    KE_ISP1 passthrough=yes
 add action=mark-routing chain=output connection-mark=isp-2 new-routing-mark=\
    KE_ISP2 passthrough=yes


 /ip route
 add check-gateway=ping distance=1 gateway=192.168.100.1 routing-mark=KE_ISP1
 add check-gateway=ping distance=1 gateway=192.168.0.254 routing-mark=KE_ISP2
 add check-gateway=ping distance=1 gateway=192.168.100.1
 add check-gateway=ping distance=1 gateway=192.168.0.254

Sumber : https://www.youtube.com/watch?v=sMWj7IuworQ