Mikrotik simple bandwidth control
There’s a really easy way of controlling bandwidth of an interface (e.g. guest interface).
It’s done via queues:
/queue simple add interface=guest max-limit=2M/2M disabled=no
Where “guest” is the interface name and 2M is the down/uplink speed in bps you want to shape it to.
More about this on Mikrotik Wiki
S.