Load balancing over a bridge interface: it’s possible?
No bonding, no tunnels, simply two o more ports on a bridge interface…
tnx for the answer 
It is possible to play with port costs and achieve situation when download goes through one port and upload through another.
ok, only load balance UP/DOWNload…
I tried… two RBxxx, one bridge on each RB.
Two port on each bridge (eth_a and eth_b).
“Simmetric” path cost 10 (eth_a_1 and eth_b_2) and 1 (eth_a_2 and eth_b_1), but not work…
Enabling “IP Firewall”, I can mangle IP packet and manage the traffic?
Yes you can
please send me the configaration