IEEE/ICACT20260346 Slide.04        [Big Slide]       [YouTube] Oral Presentation
This motivates the concept of the Convergence Blind Zone, or CBZ. CBZ is the vulnerable period where the physical topology has already changed, but routing control information has not been updated yet. During CBZ, packets continue to follow pre-failure routes, repeatedly pointing to failed next hops, which creates blackholes, queue buildup, and severe energy waste. The real problem is not that no path exists, but that a new path cannot be computed and installed fast enough before convergence completes.

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