Dynamic anycast in inter-datacenter networks over elastic optical infrastructure

Since the optical orthogonal frequency-division multiplexing (O-OFDM) technology can facilitate agile spectrum management, the elastic optical infrastructure based on it has become a promising candidate for the physical-layer of inter-datacenter networks. In this paper, we investigate dynamic anycast in such networks. Firstly, we design three metrics to consider computing and bandwidth resources jointly, and propose anycast algorithms with single-path routing based on them. Then, we propose an anycast algorithm with multipath routing to further improve the network performance. Our simulation results indicate that the anycast algorithm with multipath routing can fully utilize the bandwidth resources in the optical infrastructure, make computing resources become the bottleneck, and reduce the bandwidth blocking probability of anycast requests effectively.