shaping bridge interface

I have an rb150. ether1 faces the wan. bridge1, containing ethers 2 through 5, faces the lan. I want to use / queue tree to shape downstream traffic. The following does not work (traffic is unshaped):

/ ip firewall mangle add chain=forward action=mark-packet packet-mark=downstream out-interface=bridge1
/ queue tree add name=“queue1” parent=bridge1 packet-mark=bridge-downstream limit-at=1048576 queue=default priority=8 max-limit=1048576 burst-limit=0 burst-threshold=0 burst-time=0s disabled=no

If put the queue directly on the etherx interface, it works (traffic is shaped), but I want to have a small lan sharing this bandwidth, so I would like to put the queue on the bridge1 iface, and have 4 ports for machines.

Thanks-
Ryan