Wireless bridge 2 networks

RouterOS Beginner Basics
1

Hi,

I have 2 networks (they are about 200 meters from each other).
Both networks have there own internet breakout (gateway)
Both networks have a differeten IP subnet (1 had 172.16.0.0/21 the other has 172.17.0.0/21)
I want to bridge the two netwerks to each oter with 2 SXT-AC devices.

To make it a little more complex.
Between the two buildinges there is a site2 site connection but the speed is not so good.
I like to use the wireless bridge for some traffic (to speed up).
172.16.0/129/27 and 172.17.0.129/27 must communicate over the wireless link of mikrotik (if it is possible.

What configuration must I have?
Can someone help?

2

They r on the same subnet. Just put your connected SXT on AP Bridge, then scan on the other SXT (to check your loss). And then connect.

3

They are not no the same subnet.
172.16.0.0/21
172.17.0.0/21

4

the two SXT-AC should have one interface connect to each subnet (assigne one IP within the subnet) and connect to each other on a different subnet, I’d suggest to use a /30.
then set up routing between the two SXT-AC so they know where to forward traffic for each subnet.

or this can be done by OSPF. many tutorials around for OSPF