| http://www.w3.org/ns/prov#value | - In the embodiment, by creating as many tree manager 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 cost of the sections that use IEEE 802.1D are set to be higher, and, in case that there is a need to detour the section due to a failure or the like, performing a switch to use the tree in which the higher cost is assigne
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