TVDR: A Two-Level Virtual Domain Routing Scheme for Content-Centric Networking

In content-centric networking (CCN), the content is retrieved based on its name with the aid of in-network caching, instead of relying on IP address. Since the number of content names is several orders of magnitude higher than that of IP addresses, it presents a significant scalability challenge. Moreover, CCN caches content in every passed router, so multiple identical copies may exist among nearby routers. To address these problems, we propose two-level virtual domain routing (TVDR) utilizing the concept of the virtual domain to reduce FIB entries maintained in the network. To improve cache utilization, we introduce a new caching strategy TVDR-Membership to assign cache capacity. To demonstrate the feasibility of TVDR, We evaluate the TVDR against classical CCN and hash-based routing to assess its feasibility. Results show that TVDR effectively improves scalability and cache utilization and decreases processing delay to fetch contents.