Software defined status aware routing in content-centric networking

Content-Centric Networking (CCN) is considered as an alternative Internet paradigm to solve the problems of current host-centric Internet. However, how to choose the optimal forwarding interface for the Interest packet and select an optimized routing path is a great challenge in CCN. This paper proposes a Software Defined STatus Aware Routing (SD-STAR) mechanism for CCN. The SD-STAR utilizes controllers to collect network statuses such as packet delay and node load. The forwarding priorities of the matching interfaces are updated according to the network status by controllers. The Interest packet is forwarded through the matching interface with the highest forwarding priority. The SD-STAR mechanism also works under link or node failures. Simulation results show that the SD-STAR effectively reduces the number of Interest packets and the average delay of content requests as well as the network bandwidth consumption compared with the traditional routing algorithms in CCN.