Understand and configure Bridge Horizon on the MikroTik switch for port isolation

Another method of using port isolation is Bridge Horizon.

If you are using a MikroTik switch that doesn’t support HW-offload, you can still do port isolation but using the Bridge Horizon.

The bridge horizon option can be found on the ports inside a bridge as follows:

The idea is as follows: if you have the same bridge horizon on 2 or more ports, then they are not able to communicate with each other. In another word, traffic will not flow out of a port with a horizon value the same as it came in. Again remember, the ports in the bridge should have HW-offload disabled.

Let’s do a LAB to see if this is going to work or not.

LAB: Bridge Horizon

Let’s put Ether15, Ether17 and Ether18 in a bridge port and be sure that we have hardware offload disable. I will show you how to do that on Ether15 only and you can do the same for Ether17 and Ether18.

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