Hybrid Routing Strategy Research For POF-ICN

The core function of Internet has been changing from focusing on communication among hosts to contents distributing.However,traditional networking has limits on dealing with network expanding and contents,spatially multi-media contents distributing.Nowadays,many researchers have been trying to explore the next future Internet,depending on the demand of current needs of networking.One of the hotspot is ICN,which is short for Information-Centric-Networking,and propose to focus on information or contents distributing.And Software-Defined-Networking has a principle to separate the control panel and data panel of network,and using controller to manage switches in a centralized mode.Thus it could simplify network deployment and make network configuration easily.Protocol-Oblivious-Forwarding is a new SDN southern interface which evolves from OpenFlow protocol.It has the ability to defined a new network framework,including ICN.So it has great significance.The researching of ICN emphasizes on naming,routing,caching and so on.Routing scalability is the most important factor considering the needs of future network.A lot of routing strategies of ICN realized by SDN is to use dynamic flow tables to set up route path,which needs set up or tear down flow tables frequently.So it has the flaws of respectable processing delays,increasing burden of controllers and memory cost in nodes.Source routing has the advantage of simplifying network states and improve forwarding efficiency of nodes.In this dissertation,we propose a Source-routing Originated Scalable Routing strategy applied in POF based Information-Centric-Networking.Considering the different needs on route efficiency and scalability in the scenarios of intra and inter domains.It is proposed to use port stacks to plan the intra-domain path,match the domain name and static flow tables in nodes to control inter-domain routing.In ICN the design of routing together with caching have a much influence on content distributing and users' experience.In Source-routing Originated Scalable Routing strategy,route path is constructed from content requester to content owner,and cache operations occur on this path.So it may can't be aware of content caches off path,and can't reduce redundancy content caches.In this paper we propose a cache-aware routing strategy,that is Hash-based Core Caching Routing,which reduces cache redundancy in convergence layer and core layer of network using hash method.Improve usage of cache memories and contents distributing of the whole network.And to make cache designs depends on such how much benefits such cooperative caching can get on reducing network bandwidth and users' requesting delay.By means of experiences,we demonstrate that the Source-routing Originated Scalable Routing strategy could reduce pressure of controller,simplify network states and has a preferable scalability performance.The hybrid route strategy with the complementary of Hash-based Core Caching Routing could reduce the cost of route in bandwidth,delay,improve cache-hit rate and improve contents distributing.