MSTP on VLAN interface that is part of the bridge

RouterOS General
1

Hi, I have 2 routers connected with two VLANs.
Each router has it own bridge interface.

VLAN 1 connects those bridges together between routers.
Now I would like to get redundancy and spin up another VLAN which would be also part of the existing bridge.

Should be MSTP enabled on both bridges?

Im facing issue, when I enable both VLANs, whole physical interface is going down because of loop detected.

I should also mention, that VLAN is created through “/interface/vlan” and that interface is added as bridge port. I can’t do it properly by adding whole interface to the bridge because it is already part of the different bridge.

2

To summarize my goal: I want two bridges connected via 2 VLANs providing failover.

3

I’m not sure I understand your problem exactly.

Do you want physical redundancy i.e. have two (essentially parallel) wires connecting your routers, so that if one fails, the other takes over?

4

That is your problem, see https://help.mikrotik.com/docs/spaces/ROS/pages/19136718/Layer2+misconfiguration#Layer2misconfiguration-VLANonabridgeinabridge. The ports should all be members of a single VLAN-aware bridge with appropriate VLAN configuration,