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ID/Locator separation architecture is proposed in order to reduce routing table size in the current Internet. In this architecture, an end-host can be identified by unique ID which is independent of its network protocol in use. This capability of identifying an end host with ID enables communication with end hosts operating different network-layer protocol. This inter-layer 3 networking brings another benefit of improvement of shortest path because it enables paths including other network(s) and increases candidate paths between host pairs. In this paper, we evaluate this improvement of shortest path brought by inter-layer 3 networking. In inter-layer 3 networking, a shared node connecting different network layer plane plays an important role. We evaluate shortest path improvement with various shared node locations and show that strategic assignment of shared nodes brings large improvement.