É essa:

/ ip firewall mangle
add chain=prerouting protocol=udp action=mark-connection \
new-connection-mark=udp_teste passthrough=yes comment="MARCA O DE UDP" \
disabled=no
add chain=prerouting connection-mark=udp_teste action=mark-packet \
new-packet-mark=udp passthrough=yes comment="" disabled=no

/ queue tree
add name="UDP" parent=global-in packet-mark=udp limit-at=100000 \
queue=default priority=8 max-limit=100000 burst-limit=0 \
burst-threshold=0 burst-time=0s disabled=no