Hi Huaimo,
> Before moving, each of N nodes may advertise an Area Leader Sub-TLV and a > Dynamic Flooding Sub-TLV. After moving, only the leader node advertises a > (Updated) Area Leader Sub-TLV. The Area Leader sub-TLV should be advertised by all nodes that are candidates to being Area Leader. Strictly speaking, you could choose only one, but that would become a single point of failure. For simple redundancy, two seems a practical minimum, however it still seems somewhat risky due to the possible loss of an Area Leader after a multi-failure partition. Thus, it is likely that all N nodes will continue to advertise the Area Leader sub-TLV. Since no sub-TLVs are withdrawn, there is no space savings. Tony
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