| http://www.w3.org/ns/prov#value | - In the embodiment, by creating as many tree managers as the number of sections that use IEEE 802.1D, creating a different tree for each section that uses IEEE 802.1D, in which the costs of the sections that use IEEE 802.1D are set to be higher, and, in case there is a need to detour the section due to a failure or the like, using the tree in which a higher cost is assigned to the sections, it is p
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