The scenario: I would like to create a transparent L2 connection between two LANs via a third LAN, and run spanning tree between the endpoints without interfering with the configuration of the intermediate LAN switches. My idea is to VLAN tag the traffic between the LANs at the endpoints, including the STP traffic. In that way I hope that the intermediate switches will just forward the BPDUs used for STP, and not look into the contents of these frames.
The question: How will an Ethernet switch react to incoming BPDUs that are VLAN tagged? Or put another way: Will the swicthes in the intermediate LAN1) Change their STP configuration according to the BPDU 2) Discard the BPDU 3) Forward the BPDU with the VLAN tag preserved 4) or...?
I cannot seem to find anything in the IEEE standards about this.
If this doesn't work, are there alternatives?
BR, Mike Absalon