The Multiple Care-of Addresses Registration mechanism was designed for a single Mobile IPv6 node, but when this mechanism is used on nested Network Mobility, the Mobile Routers do not know how many paths are available and how to control the path of a packet, and the Mobile Router cannot get the upper layer Mobile Network's link failure information to adjust the routing. The "Path ID" mechanism is designed to identify a path, and based on this mechanism, the Home Registration procedure is modified to detect all the available paths, the routing of common data packets is modified to control the path for a packet, and the Router Advertisement message is modified to inform the lower layer Mobile Networks about the upper layer link failure.
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