Using queue tree burst

I have a client that would like the ability to burst traffic at a higher rate. I have set up a queue tree as follows which was working for just rate limiting. I have changed the commands to the following:

/queue tree
add burst-limit=5M burst-threshold=2M burst-time=10s disabled=no limit-at=0 max-limit=3M name=edis_Down
packet-mark=edis parent=ether5 priority=8 queue=default
add burst-limit=5M burst-threshold=2M burst-time=10s disabled=no limit-at=0 max-limit=3M name=edis_Up
packet-mark=edis parent=ether1 priority=8 queue=default

Do I need to set limit-at to some number. The docs say it is the CIR. Also will the winbox show me if he is bursting?

Thanks in advance,

-Brian