How to eanble ip routing on a given interface?

Hi,

On a CRS-354 running ROS v7.7, how can one turn on ip routing on a specific interface, for instance ether12?

It appears to me even after configuring ip address on an interface, the STP is still sending out BPDU on that interface configured as layer 3 interface. So, what is the proper way to enable ip routing on an interface on Mikrotik CRS-354 device.

Thank you,

Lawrence