Virtual Infrastructures (VIs) emerged as a potential solution for network evolution and cloud services provisioning on the Internet. Deploying VIs, however, is still challenging mainly due to a rigid management of networking resources. By splitting control and data planes, Software-Defined Networks (SDN) enable custom and more flexible management, allowing for reducing data center usage, as well as providing mechanisms to guarantee bandwidth and latency control on switches and endpoints. However, reaping the benefits of SDN for VI embedding in cloud data centers is not trivial. Allocation frameworks require combined information from the control plan (e.g., isolation policies, flow identification) and data (e.g., storage capacity, flow table configuration) to find a suitable solution. In this context, the present work proposes a mixed integer programming formulation for the VI allocation problem that considers the main challenges regarding SDN-based cloud data centers. Some constraints are then relaxed resulting in a linear program, for which a heuristic is introduced. Experimental results of the mechanism, termed as QVIA-SDN, highlight that an SDN-aware allocation solution can reduce the data center usage and improve the quality-of-service perceived by hosted tenants.

中文翻译：

---

QVIA-SDN：在基于SDN的云上实现可感知QoS的虚拟基础架构分配

虚拟基础架构（VI）逐渐成为Internet上网络演进和云服务供应的潜在解决方案。然而，由于对网络资源的严格管理，部署VI仍然具有挑战性。通过划分控制平面和数据平面，软件定义网络（SDN）支持自定义且更灵活的管理，从而减少了数据中心的使用，并提供了机制来保证对交换机和端点的带宽和延迟控制。但是，收获SDN的好处是将VI嵌入到云数据中心中并非易事。分配框架需要来自控制计划（例如，隔离策略，流标识）和数据（例如，存储容量，流表配置）的组合信息，以找到合适的解决方案。在这种情况下，本工作针对VI分配问题提出了混合整数编程公式，该公式考虑了基于SDN的云数据中心面临的主要挑战。然后放宽一些约束，从而生成线性程序，为此引入了启发式方法。该机制的实验结果被称为QVIA-SDN，它突出表明SDN感知分配解决方案可以减少数据中心的使用并改善托管租户的感知服务质量。