Laurent Ciavaglia, Editor-in-ChiefMohamed Faten Zhani, Managing EditorTBD, Deputy Managing Editor Syed Hassan Ahmed Dr. J. Amudhavel Francesco Benedetto Korhan Cengiz Noel Crespi Neil Davies Eliezer Dekel Eileen Healy Chris Hrivnak Atta ur Rehman Khan Marie-Paule Odini Shashikant Patil Kostas Pentikousis Luca PreteMuhammad Maaz Rehan Mubashir Rehmani Stefano Salsano Elio Salvadori Nadir Shah Alexandros Stavdas Jose Verger, Overview of RFC7426: SDN Layers and Architecture Terminology, Intent-Based Management and Orchestration of Heterogeneous OpenFlow/IoT SDN Domains, TableVisor 2.0: Towards Full-Featured, Scalable and Hardware-Independent Multi Table Processing, SD-WAN Strategy to Address Key Trends and Scalability, http://www.openflow.org/documents/openflow-wp-latest.pdf, http://www.etsi.org/deliver/etsi_gs/nfv/001_099/002/01.01.01_60/gs_nfv002v010101p.pdf, http://www.itu.int/rec/T-REC-Y.3300-201406-I/en, https://www.opennetworking.org/images/stories/downloads/sdn-resources/technical-reports/TR_SDN_ARCH_1.0_06062014.pdf, Download IEEE Softwarization Editorial Guidelines for Authors. SDN architecture. Southbound Interface: It lies between the controller and the data plane forwarding devices. Applications can also reside in the network device. This separation allows faster innovation for both layers as experience has already shown. However, with the adoption of SDN principles, the distinction between control and management plane is no longer so clear-cut. In our previous article, we had a good overview of SDN as a technology, why it’s needed, and how IT industry is adopting it. Finally, RFC7426 recalls the CAP theorem that states that for a distributed system, between three characteristics, Consistency, Availability and Partitioning tolerance, a designer can only select two at best. A typical representation of SDN architecture comprises three layers: the application layer, the control layer and the infrastructure layer. His h-index is 27. We advocate that the SDN southbound interface should encompass both the CSPI and the MSPI. SDN broadly consists of three layers: Application layer Control layer Infrastructure layer SD-WAN architecture is a virtualized overlay on top of physical infrastructure. SDN Layers and Architecture Terminology A typical representation of SDN architecture includes three layers: the application layer, the control layer and the infrastructure layer. However, there is increasing confusion as to what exactly SDN is, what layers comprise the SDN architecture and what are the interfaces. The Management Plane may support more than one MPSI. The … Control Plane Services provide access to other Services or Application above the control plane. Examples of applications include network topology discovery, network provisioning, path reservation, etc. When taken as a whole, the control plane has been distributed network-wide. The first characteristic is timescale. The ForCES model can be used to describe the DAL, both for the Operational and the Forwarding Plane. Employing the layered architecture model introduced in RFC7426 can provide researchers and practitioners with useful guidelines on how to build disaggregated network system designs. The key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT", "SHOULD", "SHOULD NOT", "RECOMMENDED", "MAY", and "OPTIONAL" in this document are to be interpreted as described in [RFC2119]. The Operational Plane represents the operational state of the device, for example, with respect to network ports and interfaces. RFC7426 distinguishes the following five SDN planes: All planes mentioned above are connected via interfaces. Timescale specifies how fast a plane responds and needs to respond. Southbound APIs push information to … Management Plane Services provide access to other services or application above the Management Plane. In other words, the control is decoupled from hardware and implemented in software. Software-defined networking architecture layers consist of 3 layers. Under this architecture… SDN, Software Defined Networking is the latest architecture that is used for cost-effective, adaptable and easily manageable applications. The generic use of the term resource makes the RFC7426 architectural model applicable to the NFV and SFC domains as well. The Control Plane communicates with the Forwarding Plane of devices using a Control Plane Southbound Interface (CPSI) with DAL as a point of reference and is responsible for instructing the Forwarding Plane on how to handle network packets. However, there is increasing confusion as to what exactly SDN is, what is the layer stucture in an SDN architecture and how do layers interface with each other. Examples of CPSIs are ForCES [RFC5810] and the Openflow protocol [OpenFlow1.3.1]. If you think about OSPF, it is a protocol that concerns itself with layer … Precise implementation details allowed within this SDN architecture are provided in more detailed ONF architecture … This separation can allow faster innovation cycles at both layers as experience has already shown. 3. He has led the development of several testbeds and demonstrators in the context of EU projects, most of them released as Open Source software. There will be content servers used for media delivery or caching, on a service … This network supports massive connections, ultra … The layers … Applications and services that use services from the control and/or management plane form the Application Plane. The Forwarding and the Operational Planes can be exposed using a Device Abstraction Layer (DAL), which may comprise one or more abstraction models. a) The application layer SDN Network Architecture. SDN architecture has three layers that communicate via northbound and southbound application programming interfaces (APIs). SDN network architecture consists of the following: Application Layer : AL contains network applications related to data and security handling. He has taken part in the successful IST projects FlexiNET and Phosphorus. First is the management plane, which is a set of network applications that manage the control logic of a software-defined network. This document is subject to BCP 78 and the IETF Trust's Legal Provisions Relating to IETF Documents (http://trustee.ietf.org/license-info) in effect on the date of publication of this document. Software-Defined Networking introduces an abstraction layer between the Forwarding and the Control layer in order to separate them. He has been principal investigator in several research and technology transfer contracts funded by industries (Docomo, NEC, Bull Italia, OpenTechEng, Crealab, Acotel, Pointercom, s2i Italia) with a total funding of more than 1.3M€. Software-defined networking (SDN) technology is an approach to network management that enables dynamic, programmatically efficient network configuration in order to improve network performance and monitoring, making it more like cloud computing than traditional network management. Control Plane & Data plane are local in SDN Model: FALSE TRUE. Examples of service interfaces are REST APIs. It is important to distinguish between control and management interfaces as they have their own distinct characteristics depending on the respective planes. SDN Architecture Issue 1.0 11 The architecture uses the term layer network(always qualified as server layer network, client layer network) to reflect recursion in the data plane (,). Examples of Forwarding Plane abstraction models are the ForCES model [RFC5812] and the OpenFlow switch model [OpenFlow1.3.1]. The above model can be used to describe in a concise manner all prominent SDN-enabling technologies, as we explain in the following subsections. SDN architecture is structured on three primary layers, the Data plane, which consists of the network elements, the Control plane which acts as the central Controller and the Application plane which … Now, let’s get a layer deeper, and understand SDN’s architecture and the role of the Openflow protocol in the implementation of the technology. Management Applications can use MAL to manage the network device without providing any service to upper layers. From what I know that the architecture is broken into the three layers. Code Components extracted from this document must include Simplified BSD License text as described in Section 4.e of the Trust Legal Provisions and are provided without warranty as described in the Simplified BSD License. The SDN northbound interface is implemented in the Service Abstraction Layer. Software-defined networking (SDN) is a newly emerging computer networking architecture. This new paradigm, with its promised benefits, has the potential to create an inflection point in deploying cloud services. The architecture defined provides an abstract view of the various planes, which is devoid of implementation details. 1 SDN Architecture Overview This document presents the high-level view of the Software-Defined Network (SDN) architecture as seen by the ONF along with key architectural principles of SDN. Its main distinguishing factor is the separation of the data plane from the control plane in routers and switches. His main field of interest is network management, network protocols and network services. However, despite the popularity of SDN in academia and industry, until recently there was a bit of confusion regarding the layers and interfaces of an SDN architecture. ITU, "Framework of software-defined networking", ITU Recommendation Y.3300, June 2014, <, Open Networking Foundation, "SDN Architecture, Version 1", June 2014, <. In this section, we will present a review of the architecture of SDN and OpenFlow, its main implementation, as shown in Figures 1 and 2, respectively. Control plane state usually changes rapidly whilst management plane state may remain static for a longer period of time. The OSI is normally a reference to a single device where one layer from one device talks to its respective layer on another device. The target reference architecture for the transport SDN controllers is hierarchical, with specific domain controllers per technological domain (IP/MPLS, microwave, optical) and a hierarchical controller to … CAL must be able to utilize the Openflow protocol. Abstraction layers refer to the abstraction of resources of specific planes and interfaces refer to the APIs between planes. He is the author/co-author of a number of RFCs and drafts in the ForCES working group in IETF and the SDNRG research group in IRTF. Evangelos Haleplidis, Spyros Denazis, Kostas Pentikousis, Jamal Hadi Salim, David Meyer and Odysseas Koufopavlou, "Software-Defined Networking (SDN): Layers and Architectures Terminology", RFC7426, January 2015. In this light, the Internet Research Task Force (IRTF) IRTF Software Defined Networking Research Group (SDNRG) worked intensively on clarifying these concepts and terminology. This Internet-Draft will expire on January 16, 2014. For his diploma thesis he implemented part of the IPv6 protocol in hardware (VHDL). The SDN application layer, not surprisingly, … It also controls the Applications at Application Layer. This draft attempts to provide a concise reference document for future discussions on SDN. Examples of management applications include network monitoring applications. Evangelos Haleplidis, Mojatatu Networks, Canada. If you wish to have an article considered for publication, please contact the Managing Editor at sdn-editor@ieee.org. The Management Plane communicates with the network device Operational Plane using a Management Plane Southbound Interface (MPSI) with DAL as a point of reference. The Control Abstraction Layer (CAL) provides access to control applications and services to various CPSIs. 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