SnF Scheduling of Multicast Transfers Across Inter-Datacenter Optical Networks
Xiao Lin, Jiangnan Zou, Shengnan Yue, Weiqiang Sun, Weisheng Hu · 2021
Traffic fluctuations make conventional multicast tree difficult to fully utilize the residual bandwidth in the inter-datacenter networks. In this paper, we introduce datacenter storage into the provisioning process of multicast transfers. A scheduling method, named Store-and-Forward-Tree (SnFTree), is proposed for multicast transfers in the software-defined inter-datacenter optical network. By leveraging temporary storage at intermediate sites, a multicast tree can be segmented into time-independent subtrees when provisioning an entire light-tree fails. Benefiting from the broadcast nature of optical multicast, intermediate sites can provide cut-through routing and temporary storage simultaneously with negligible processing delay. By using load-balancing tree computation, traffic can be balanced across the network efficiently. Simulations show that SnFTree provides extra provisioning flexibility and hence outperforms the state-of-the-art scheduling methods in terms of blocking probability and the number of OpenFlow Agent updates.