Recently found Tenda Mesh wifi runs spanning-tree between it's Wifi devices. Plugged one into my lab and the Tenda gateway device became the root bridge. I ended filtering the BPDU's on the port the Tenda Device was connected to to keep the spanning-tree calculations separate. Only have found bits of information on this so far would like to know more or is it as simple as just filtering the BPDU's between the too.