A layered P2P network topology based on physical network topology

One of the goals of P2P file-sharing system is to provide reliable and convenient sharing mechanism for users, so the resources can be gotten more quickly. However, in traditional DHT network, the problem of mismatching between the P2P overlay network and the physical underlying network has not been taken into consideration, which greatly limits the performance in various search or routing techniques. In this paper, a hierarchical physical location related DHT topology named MLC (Multi-level Chord) is proposed, and it can alleviate the mismatching problem. Through the layered topology mechanism and the role of GL (Group Leader) and SL (Slice Leader), a better balance of the load can be achieved. With the bottom-up transmitting mechanism, the routing efficiency and search speed improve obviously. PPU (Period Partial Update) algorithm can reduce some of the unnecessary traffic. Analysis shows MLC is a more efficient topology.