Yin Jie, Guo Jiannan, Kong Bingxin, Yin Heqing, Zhu Zuqing
Opt Express. 2017 Jun 26;25(13):15468-15480. doi: 10.1364/OE.25.015468.
Software-defined elastic optical networks (SD-EONs) provide operators more flexibility to customize their optical infrastructures dynamically. By leveraging infrastructure-as-a-service (IaaS), virtual SD-EONs (vSD-EONs) can be realized to further enhance the adaptivity of SD-EONs and shorten the time-to-market of new services. In this paper, we design and demonstrate the building and operating of quality-of-service (QoS) aware survivable vSD-EONs that are equipped with transparent data plane (DP) resiliency. Specifically, when slicing a vSD-EON, our network hypervisor (NHV) chooses to use "1:1" virtual link (VL) protection or on-demand VL remapping as the DP restoration scheme, according to the service-level agreement (SLA) between the vSD-EON's operator and the infrastructure provider (InP). Then, during an actual substrate link (SL) failure, the NHV realizes automatic DP restoration that is transparent to the controllers of vSD-EONs. We build a network testbed to demonstrate the creation of QoS-aware survivable vSD-EONs, the activation of lightpaths in the vSD-EONs to support upper-layer applications, and the automatic and simultaneous QoS-aware DP restorations during an SL failure. The experimental results indicate that our vSD-EON slicing system can build QoS-aware survivable vSD-EONs on-demand, operate them to set up lightpaths for carrying real application traffic, and facilitate differentiated DP restorations during SL failures to recover the vSD-EONs' services according to their SLAs.
软件定义的弹性光网络（SD-EON）为运营商提供了更大的灵活性，以便动态定制其光基础设施。通过利用基础设施即服务（IaaS），可以实现虚拟SD-EON（vSD-EON），以进一步增强SD-EON的适应性并缩短新服务的上市时间。在本文中，我们设计并演示了具备透明数据平面（DP）弹性的、支持服务质量（QoS）的可生存vSD-EON的构建和运行。具体而言，在对vSD-EON进行切片时，我们的网络管理程序（NHV）根据vSD-EON运营商与基础设施提供商（InP）之间的服务水平协议（SLA），选择使用“1:1”虚拟链路（VL）保护或按需VL重映射作为DP恢复方案。然后，在实际的底层链路（SL）发生故障期间，NHV实现对vSD-EON控制器透明的自动DP恢复。我们构建了一个网络测试平台，以演示创建支持QoS的可生存vSD-EON、在vSD-EON中激活光路以支持上层应用，以及在SL故障期间进行自动且同时的QoS感知DP恢复。实验结果表明，我们的vSD-EON切片系统可以按需构建支持QoS的可生存vSD-EON，运行它们以建立用于承载实际应用流量的光路，并在SL故障期间促进差异化的DP恢复，以根据其SLA恢复vSD-EON的服务。
