In Software Defined-Content Delivery Networks (SD-CDN), the policies of tenants such as Youtube, Netflix, Office 365, etc. are not the same due to having different 5G traffic requirements for such contents as enhanced Mobile Broadband (eMBB), ultra-reliable low-latency (URLLC) and massive machine-type communication (mMTC). This leads SD-CDN multi-tenant slicing to provide different services with limited network resources, where each tenant can functionally manage their own virtual slice of a physical component according to service level agreements (SLAs). However, they are not permitted to dynamically configure their own components. Therefore, the physical end-to-end configuration of all edge devices causes extra hardware and bandwidth costs. Although software as a service (SaaS) is more preferred to handle cost-efficiency on a switch configuration that increases forwarding throughput (Mbps) with a less number of physical components in SD-CDN, the edge devices can be only served as infrastructure as a service (IaaS) currently. This motivation leads us to serve the switch as a service that includes both IaaS and SaaS characteristics. Therefore, we propose an OpenFlow as a service (OFaaS) design where each tenant has flow management and switch configuration permissions on their own virtual slice. In flow management, we define a novel Service Oriented Architecture (SOA) to orchestrate OFaaS driven topology by isolating each tenant from physical complexity. Here, each tenant can dynamically alter QoS on a flow and load balance between a sub-set of contents via OpenFlow protocol. In switch configuration; a novel OFaaS Management Algorithm for a multi-tenant slicing increases the number of tenants served per OpenFlow switch thanks to OFaaS design. It enables an end-to-end configuration via the NETCONF protocol with a novel YANG model of OFaaS. According to performance evaluation; OFaaS has the same forwarding throughput as conventional IaaS based OpenFlow switch for a homogenous content, whereas it has 71% more forwarding throughput (Mbps) and it has 40% more cost-efficient than conventional one for a heterogeneous content with $17 savings per tenant.

中文翻译：

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OFaaS：OpenFlow交换机作为SD-CDN中的多租户切片服务

在软件定义内容交付网络（SD-CDN）中，由于对增强型移动宽带（eMBB）等内容的5G流量要求不同，因此诸如Youtube，Netflix，Office 365等租户的策略不相同。超可靠的低延迟（URLLC）和大规模的机器类型通信（mMTC）。这将导致SD-CDN多租户切片为有限的网络资源提供不同的服务，其中每个租户都可以根据服务级别协议（SLA）在功能上管理自己的物理组件虚拟切片。但是，不允许他们动态配置自己的组件。因此，所有边缘设备的物理端到端配置都会导致额外的硬件和带宽成本。尽管更优选软件即服务（SaaS）来处理交换机配置上的成本效益，从而以更少的SD-CDN物理组件数量来提高转发吞吐量（Mbps），但是边缘设备只能用作基础架构。服务（IaaS）当前。这种动机导致我们为切换为服务包括IaaS和SaaS特性。因此，我们提出了一种OpenFlow即服务（OFaaS）设计，其中每个租户在其自己的虚拟分片上都具有流管理和交换配置权限。在流管理中，我们定义了一种新颖的面向服务的体系结构（SOA），以通过将每个租户与物理复杂性隔离开来来协调OFaaS驱动的拓扑。在这里，每个租户都可以通过OpenFlow协议动态更改内容子集之间的流和负载平衡上的QoS。在交换机配置中；OFaaS设计为多租户切片提供了一种新颖的OFaaS管理算法，从而增加了每个OpenFlow交换机服务的租户数量。它可以通过NETCONF协议​​使用新颖的OFaaS YANG模型进行端到端配置。根据绩效评估；