What will happen if max-limit and limit-at are not set for some of the Child queues in a Queue tree? My guess from testing is - their priority works, but they are not guaranteed to get any bandwidth yet they get just a little anyway, in case other queues with set limit-ats choke up the link.
If you don’t set it the child will have the same limit as the parent.
This is true. But my question is what will be the behavior when packets are rearranged. Example: http://wiki.mikrotik.com/wiki/HTB When limit-at=0 how much will it take from it’s parent. After that, when max-limit=0, how much will it take from it’s parent?
http://wiki.mikrotik.com/wiki/HTB
Try to run same example with limit-at=0 - without CIR traffic, it will just skip the limit-at part and will use its priority only to get max-limit..