Abstract: A method for video conferencing among nodes on a network identifies a host node in a first subnet and one or more additional participating nodes and identifies, from among the additional participating nodes, at least one active participant node. For the host node and for each of the participating nodes, a spanning tree is generated for communication with other nodes. The spanning trees provide multicast communication between a first reflector node and one or more participating nodes in the first subnet, and provide a unicast communication channel between the first reflector node in the first subnet and a second reflector node in a second subnet. The spanning tree for the host node is configured for a unicast communication channel to the at least one active participant node. Video conference content is transmitted from the host node and presented at the participating nodes according to the spanning trees.