| http://www.w3.org/ns/prov#value | - The reason is that as many tree managers as the number of sections that use IEEE 802.1D are created, a different tree is created for each of the sections that use 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, switching is performed to use the tree in which the higher cost i
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