MikroTik RouterOS v2.9 Reference Manual page 438

Leaf1 borrows from ClassA, Leaf2 and Leaf3 from ClassB, and ClassB also borrows from
ClassA. Now all the priorities have 'moved' to Level2. So Leaf2 is on the highest priority and
is served at first. As Leaf1 and Leaf3 are at the same priority (8) on the same level (2), they are
served, using the round robin algorithm.
Bursts
Bursts are used to allow higher data rates for a short period of time. Every 1/16 part of the
burst-time, the router calculates the average data rate of each class over the last burst-time
seconds. If this average data rate is less than burst-threshold, burst is enabled and the actual data
rate reaches burst-limit bps, otherwise the actual data rate falls to max-limit or limit-at.
Let us consider
burst-threshold=192000 and burst-limit=512000. When a user is starting to download a file via
HTTP, we can observe such a situation:
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that we have a setup, where max-limit=256000, burst-time=8,