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IEEE/ICACT20260346 Slide.12        [Big Slide]       [YouTube]	Oral Presentation
	In a shortest path tree, when a node fails, it effectively severs its entire downstream subtree. UW-LFRR captures this with a branch-off abstraction: for each failed node, it defines the set of downstream nodes whose tree paths must traverse that failed node, and then unions these sets into a failure-affected region Ku. The key role of Ku is to turn what looks like a network-wide problem into a localized subgraph problem, so subsequent relay selection and searching are confined to Ku rather than the whole network.

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