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Assumptions / Observations nodes are grouped in locator domains (LDs) locator domains consist of a single networking technology (IPv4, IPv6, etc.) have a consistent internal routing system, i.e. do not rely on any external entities/services will have one or a few rather static LDs, the core LDs(e.g. current IPv4 backbone) LDs are arranged in tree-like structures hanging from the core mobility occurs more frequently at the edges |