Hi, The estimator can use the compare bit to ask for network layer's decision whether a new link to a neighbor is promising. The network layer checks if there are neighbors with worse ETX (ETX from a neighbor to the root, excluding ETX from myself to the neighbor). If there is, it recommends to include the neighbor, then the estimator will randomly kick out a existing neighbor to accommodate this new neighbor, *without* considering ETX of neighbors. Why? Neighbors with smaller ETX than the new neighbor can be evicted.
Thanks in advance for helping me to understand. -- -Xiaohui Liu
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