Build the Multiple Spanning Tree based on the topology of the network, spanning tree construction unit (12), to register (13) spanning tree information storage table. From the Multiple Spanning Tree that are registered in (13) spanning tree information storage table, spanning tree selection unit (14), to select the spanning tree communication resources are used most effectively. Node setting unit (15) is set for each node mapping information between the spanning tree is selected and the virtual LAN that has been requested.
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