Software-Defined Networking (SDN) has the capability to revolutionize the current data center architecture and its associated networking model. Network devices are composed of resources, simple and complex, with network devices being complex resources themselves, thus allowing recursive definition and reusability. The architecture defined provides an abstract view of the various planes, which is devoid of implementation details. 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 (,). It is inappropriate to use Internet-Drafts as reference material or to cite them other than as "work in progress.". However, there is increasing confusion as to what exactly SDN is, what layers comprise the SDN architecture and what are the interfaces. 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. The Management Plane may support more than one MPSI. An interface may take multiple forms depending also on whether the connected planes reside on the same device or on different devices. This network supports massive connections, ultra … SDN pulls the control plane outside of the model. 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. SDN, as can be seen in Figure 1, comprises several abstraction layers, interfaces and distinct planes. Software-defined networking (SDN) is an architecture designed to make a network more flexible and easier to manage. The infrastructure layer is just the switches and routers, and other devices that makes up a network. 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. SDN architecture. The control of all the data plane devices are done via SDN Controller. For example, it was customary for many implementations to implement the management plane on top of the control plane. The Operational Plane represents the operational state of the device, for example, with respect to network ports and interfaces. A typical representation of SDN architecture comprises three layers: the application layer, the control layer and the infrastructure layer. He has led the development of several testbeds and demonstrators in the context of EU projects, most of them released as Open Source software. http://telecomtutorial.info Covering Introduction & Tutorial for SDN (Software defined network) and Openflow Architecture in Telco Networks . On the other hand, the management plane has been traditionally centralized and responsible for managing the control plane. If you wish to have an article considered for publication, please contact the Managing Editor at sdn-editor@ieee.org. The above model can be used to describe in a concise manner all prominent SDN-enabling technologies, as we explain in the following subsections. He received his Ph.D. in Computer Science from the Department of Electrical and Computer Engineering in the University of Patras in 2016. A typical representation of SDN architecture includes three layers: the application layer, the control layer and the infrastructure layer. This separation allows faster innovation for both layers as experience has already shown. If the Management Plane is not embedded in the network device, this interface is certainly a protocol. Examples of such applications are event monitoring, and offloading topology discovery or ARP in the device itself instead of forwarding such traffic to the control plane. draft-haleplidis-sdnrg-layer-terminology-00. His h-index is 27. The Control Abstraction Layer (CAL) provides access to control applications and services to various CPSIs. Planes refer to the collection of functions and resources that relate to the same functionality, such as the control or management plane. RFC7426 focuses on the north/south communication between entities in different planes but does not exclude entity communication within any one plane. SDN Network Architecture. 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. A simplified visualization of OpenFlow’s SDN architecture standard with separated layers with communicating APIs. The third characteristic is locality; control plane usually is distributed and with the device, whilst management plane tends to be centralized and outside devices. 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. 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. 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