Hello,

I have 2 buildings that are interconnected with the 2Gb wireless link, with mostly L2 traffic going across that link. I do want to add some redundancy to that connection, but unfortunately it is not financially feasible to lease a fiber between these 2 buildings.

So I was thinking to get an internet connection to the 2nd building, install a Mikrotik router there and bring up the EoIP tunnel between the 2 buildings over the internet. My concern is whether the BPDUs would be transferred across this link? I do need STP to understand that there's a loop in my environment and shut down the redundant link (internet one in this case) to avoid a loop.

From reading the manual, it appears that the bridged interfaces do understand BPDUs, but I can't see a confirmation anywhere whether they would be properly transported over the EoIP tunnel. Can anybody confirm that this design would work? Or maybe somebody ran similar setup and could share the experience?

Thanks!

In case anybody cares: I did do some tests with x86 Mikrotiks.
The BPDUs are properly transferred, but I needed to disable neighbor discovery on Mikrotiks in order for my Cisco switches to properly see each other and join the MST domain.
It also appears that the connection is extremely sensitive to latency. With distance of about 10ms between Mikrotiks, everything was working using L2TP tunnel with MPPE128 encryption, but turning on IPSEC resulted in switches not being able to properly communicate (I am assuming extra latency was causing BPDU packets to time out and the switches were not joining the same MST domain).