找到答案了,这个特性在 RouteOS/Mikrotik 里叫做 CIR (Committed Information Rate) 或 limit-at
RouteOS 果然强悍。。。
http://wiki.mikrotik.com/wiki/Manual:QueueCIR (Committed Information Rate) – (limit-at in RouterOS) worst case scenario, flow will get this amount of traffic rate regardless of other traffic flows. At any given time, the bandwidth should not fall below this committed rate.
https://www.mikrotik.com/testdocs/ros/2.9/root/queue.phpCIR (Committed Information Rate) - the guaranteed data rate. It means that traffic rate, not exceeding this value should always be delivered