To share what I've learned !

This particular setup to provide guaranteed bandwidth for Mail traffic. I archived through Queue tree because we can archive most complicated queuing structure through queue tree and pcq. This is a simple setup: 1) Need to mark the relevant connection andpackets. This can be a ip firewall address list / src address or port number this is depend on your requirements. 2) Define parent queue and child queues. 1)Mark the connection for mail traffic: chain=prerouting a ction=mark-connection new-connection-mark= mail passthrough=yes src-address=10.10.10.3 chain=prerouting action=mark-packet new-packet-mark= mail-packet passthrough= no connection-mark= mail chain=prerouting action=mark-packet new-packet-mark=others passthrough=yes packet-mark= ! mail (please note the ! sign) 2) create relevant queues and apply it. 3 name="Parent" parent=ether3 packet-mark="" limit-at=0 queue=default priority=8 max-limit=1024000 burst-limit=0 burst-threshold=0 burst-time=0s 4 na