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. SDN, as can be seen in Figure 1, comprises several abstraction layers, interfaces and distinct planes. The infrastructure layer is just the switches and routers, and other devices that makes up a network. Since SDN proponents initially discussed a centralized controller, CAP provides a good tool to specify the issues that this may bring. ForCES can be mapped on the above framework as follows: Openflow can be mapped on the above framework as follows: NETCONF can be mapped on the above framework as follows: draft-haleplidis-sdnrg-layer-terminology-00, Department of Electrical and Computer Engineering, Key words for use in RFCs to Indicate Requirement Levels, Forwarding and Control Element Separation (ForCES) Protocol Specification, Forwarding and Control Element Separation (ForCES) Forwarding Element Model, YANG - A Data Modeling Language for the Network Configuration Protocol (NETCONF), Management Information Base (MIB) for the Simple Network Management Protocol (SNMP), An Architecture for Describing Simple Network Management Protocol (SNMP) Management Frameworks, The Open vSwitch Database Management Protocol, OpenFlow Management and Configuration Protocol 1.1. 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. A typical representation of SDN architecture includes three layers: the application layer, the control layer and the infrastructure layer. Join our free SDN Technical Community and receive IEEE Softwarization. Control applications can use CAL to control a network device without providing any service to upper layers. The above model can be used to describe in a concise manner all prominent SDN-enabling technologies, as we explain in the following subsections. Please review these documents carefully, as they describe your rights and restrictions with respect to this document. Data, controller and … The SDN northbound interface is implemented in the Service Abstraction Layer. However, there is increasing confusion as to what exactly SDN is, what layers comprise the SDN architecture and what are the interfaces. This Internet-Draft is submitted in full conformance with the provisions of BCP 78 and BCP 79. 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€. If the planes are collocated on the same device, then the interface could be implemented via an open/proprietary protocol, an open/proprietary software inter-process communication API, or operating system kernel system calls. SDN pulls the control plane outside of the model. His current research interests include Software Defined Networking, Information-Centric Networking, Mobile and Pervasive Computing, Seamless Mobility. Software-Defined Networking introduces an abstraction layer between the Forwarding and the Control layer in order to separate them. Precise implementation details allowed within this SDN architecture are provided in more detailed ONF architecture … A typical representation of SDN architecture comprises three layers: the application layer, the control layer and the infrastructure layer. The Forwarding and the Operational Planes can be exposed using a Device Abstraction Layer (DAL), which may comprise one or more abstraction models. This separation allows faster innovation for both layers as experience has already shown. Examples of MPSIs are ForCES [RFC5810], NETCONF [RFC6241], OVSDB [I-D.pfaff-ovsdb-proto] and SNMP [RFC3411]. Examples of the Operational Plane abstraction model include the ForCES model [RFC5812], the YANG model [RFC6020] and SNMP MIBs [RFC3418]. SDN architecture has three layers that communicate via northbound and southbound application programming interfaces (APIs). When taken as a whole, the control plane has been distributed network-wide. Control Plane Services provide access to other Services or Application above the control plane. First is the management plane, which is a set of network applications that manage the control logic of a software-defined network. The major architectural differences between SDN and traditional network infrastructure are identified within the Control and Infrastructure layers. Application Plane: This is top layer in SDN architecture. The Management Abstraction Layer (MAL) provides access to management applications and services to various MPSIs. Examples of CPSIs are ForCES [RFC5810] and the Openflow protocol [OpenFlow1.3.1]. This draft attempts to provide a concise reference document for future discussions on SDN. 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. His h-index is 27. Management Applications can use MAL to manage the network device without providing any service to upper layers. RFC7426 distinguishes the following five SDN planes: All planes mentioned above are connected via interfaces. In contrast, the present network would require being more flexible architecture with a simple troubleshoot option. MAL must be able to utilize the NETCONF protocol. SDN centralizes management by abstracting the control plane from the data … 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 ForCES protocol can then be the CPSI and the MPSI. Software-defined networking (SDN) is a newly emerging computer networking architecture. Software-defined networking architecture layers consist of 3 layers. This separation can allow faster innovation cycles at both layers as experience has already shown. CAL must be able to utilize the Openflow protocol. The … Examples of service interfaces are REST APIs. The control plane responds in very small timescales while the management plane may not necessarily need to react fast to changes. This can be interpreted as having the control plane acting as a service to the management plane. RFC 7426 SDN: Layers and Architecture Terminology January 2015 Additionally, this document considers four abstraction layers: o The Device and resource Abstraction Layer (DAL) abstracts the resources of … Historically, in many networks, especially in Internet routers and Ethernet switches, the control plane has been usually implemented as tightly coupled with the network device. Application layer: It contains the typical network applications like intrusion detection, firewall, and load balancing; Control layer: It consists of the SDN … CAL and the MAL must be able to utilize the ForCES protocol. Applications and services that use services from the control and/or management plane form the Application Plane. Stefano Salsano is Associate Professor at the University of Rome Tor Vergata. Which type of solution provides lower cost & shorter time to deploy benefits? Employing the layered architecture model introduced in RFC7426 can provide researchers and practitioners with useful guidelines on how to build disaggregated network system designs. Download IEEE Softwarization Editorial Guidelines for Authors (PDF, 122 KB). This new paradigm, with its promised benefits, has the potential to create an inflection point in deploying cloud services. If the respective planes are designed so that they do not have to reside in the same device, then the interface can only take the form of a protocol. Software-Defined Networking introduces an abstraction layer and by doing so separates the Forwarding from the Control layer. SDN Layers and Architecture Terminology The second characteristic is persistency referring to how long the state of the device will remain stable. SDN was quickly, but orthogonally, followed by Network Function Virtualization (NFV)[2], an architecture allowing network functions to be run on virtual environments; and Service Function Chaining (SFC)[3], an architecture that allows services or functions to be stitched together to perform services. Examples of management applications include network monitoring applications. SDN architecture. 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. Traditional network use specialized devices (like firewall) , SDN … This separation allows faster innovation for both layers as experience has already shown. It is important to distinguish between control and management interfaces as they have their own distinct characteristics depending on the respective planes. This interface can range from a protocol, to an API or even interprocess communication. He has taken part in the successful IST projects FlexiNET and Phosphorus. Software-defined networking (SDN) is an architecture designed to make a network more flexible and easier to manage. The Operational Plane represents the operational state of the device, for example, with respect to network ports and interfaces. That is, the term resource is being used generically, irrespective of the actual instance/implementation of the resource, which can be physical or virtual. SDN Abstraction Layers. SDN broadly consists of three layers: Application layer Control layer Infrastructure layer Figure 2-1 Solution architecture model l Physical network layer Agile network devices are used to build a basic network for deploying campus applications. 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. Examples of Forwarding Plane abstraction models are the ForCES model [RFC5812] and the OpenFlow switch model [OpenFlow1.3.1]. SDN Controller communicate and control these upper and lower layer … NFV and SFC can both readily use the network programmability that SDN provides. Note that other groups may also distribute working documents as Internet-Drafts. The architecture defined provides an abstract view of the various planes, which is devoid of implementation details. Southbound Interface: It lies between the controller and the data plane forwarding devices. If you wish to have an article considered for publication, please contact the Managing Editor at sdn-editor@ieee.org. a) an infrastructure layer b) a control layer and c) an application layer. 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. 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. The application layer, not surprisingly, contains the typical network … However, there is increasing confusion as to what exactly SDN is, what the layer structure is in an SDN architecture, and how layers interface with each other. RFC7426 focuses on four characteristics for the distinction between SDN management and control. SDN Architecture : SDN Controller (Control Plane) SDN Controller is the Center of the SDN Architecture and the most important one of SDN Architecture Components. A Network Device, implemented in hardware or in software, physical or virtual, has both a Forwarding Plane and an Operational Plane. This document aims to provide a concise reference for future discussions in SDNRG. 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. SD-WAN ... At which of the following layers of the Cisco three-tier architecture should port security be implemented? Abstraction layers refer to the abstraction of resources of specific planes and interfaces refer to the APIs between planes. Control Plane & Data plane are local in SDN Model: FALSE TRUE. 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. RFC7426 follows an approach centered on network devices. RFC7426 defines the following abstraction layers: RFC7426 provides a structural and modular approach to the SDN architecture for designing networks, services and applications by giving a toolset of planes, interfaces and abstractions. Evangelos Haleplidis, Mojatatu Networks, Canada. Here, you are given spate forwarding functions and the … Copyright (c) 2013 IETF Trust and the persons identified as the document authors. SDN is meant to address the fact that the static architecture … Examples of applications include network topology discovery, network provisioning, path reservation, etc. Examples include applications that perform control functions, such as OSPF, BGP, etc. The Management Plane may support more than one MPSI. The OSI is normally a reference to a single device where one layer from one device talks to its respective layer on another device. SDN Network Architecture. Addditionally, services residing in the Application Plane may provide services to other services and applications that reside in the application plane via the service interface. 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 … Timescale specifies how fast a plane responds and needs to respond. The layers … The Management Plane communicates with the network device Operational Plane using a Management Plane Southbound Interface (MPSI) with DAL as a point of reference. If the Control Plane and the Network Device are not collocated, then this interface is certainly a protocol. Under this architecture… Its main distinguishing factor is the separation of the data plane from the control plane in routers and switches. draft-haleplidis-sdnrg-layer-terminology-00. SD-WAN architecture is a virtualized overlay on top of physical infrastructure. 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 … 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. A typical SDN architecture consists of three layers. An SDN architecture contains six major components. His main field of interest is network management, network protocols and network services. 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. Control plane state usually changes rapidly whilst management plane state may remain static for a longer period of time. Distribution layer Core layer Access layer The Control Abstraction Layer (CAL) provides access to control applications and services to various CPSIs. He is co-author of an IETF RFC and of more than 130 papers and book chapters that have been collectively cited more than 2300 times. SDN, or the concept thereof, has been in research for a very long time, but the technological advances of the networking and computing industry enabled it to fully mature and showcase major potential as a problem-solving toolset. This Internet-Draft will expire on January 16, 2014. 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 (,). SDN broadly consists of three layers: Application layer … For his diploma thesis he implemented part of the IPv6 protocol in hardware (VHDL). SDN network architecture consists of the following: Application Layer : AL contains network applications related to data and security handling. Internet-Drafts are working documents of the Internet Engineering Task Force (IETF). However, with the adoption of SDN principles, the distinction between control and management plane is no longer so clear-cut. 3. Software-Defined Networking introduces an abstraction layer between the Forwarding and the Control layer in order to separate them. This document introduces the following terms: Figure 1 provides a detailed abstraction overview of the current SDN architecture. He received his Ph.D. in Computer Science from the Department of Electrical and Computer Engineering in the University of Patras in 2016. He participated in 16 research projects funded by the EU, being Work Package leader or unit coordinator in 8 of them (ELISA, AQUILA, SIMPLICITY, Simple Mobile Services, PERIMETER, OFELIA, DREAMER/GN3plus, SCISSOR) and technical coordinator in one of them (Simple Mobile Services). Network devices can be implemented in software and/or hardware. This draft attempts to provide a concise reference document for future discussions on SDN. We advocate that the SDN southbound interface should encompass both the CSPI and the MSPI. SDN, in a nutshell, refers to a new approach for network programmability, that is, the capability to initialize, control, change, and manage network resources -and therefore behavior- dynamically via open interfaces. 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. The Service Abstraction Layer (SAL) provides access from services of the control, management and applciation plane to services and applications of the application plane. Meanwhile, the controller and switches can use southbound interfaces to communicate. The generic use of the term resource makes the RFC7426 architectural model applicable to the NFV and SFC domains as well. However, it is the SDN programs within the … In other words, SDN Controller is the brain of the system. Using open source standards, OpenFlow makes it possible to mix and … The first characteristic is timescale. Nick McKeown, Tom Anderson, Hari Balakrishnan, Guru Parulkar, Larry Peterson, Jennifer Rexford, Scott Shenker, Jonathan Turner. The SDN application layer, not surprisingly, … If the Management Plane is not embedded in the network device, this interface is certainly a protocol. CPSI can be implemented using a protocol, an API or even interprocess communication. Network devices are composed of resources, simple and complex, with network devices being complex resources themselves, thus allowing recursive definition and reusability. RFC7426 focuses on the north/south communication between entities in different planes but does not exclude entity communication within any one plane. "OpenFlow: Enabling Innovation in Campus Networks", ETSI, "Network Functions Virtualisation (NFV): Architectural Framework", ETSI GS NFV 002, October 2013, <. RFC7426 defines the following abstraction layers: Device and resource Abstraction Layer - abstracts the resources of the device's forwarding and operational planes to the control and management planes. SDN, Software Defined Networking is the latest architecture that is used for cost-effective, adaptable and easily manageable applications. The list of current Internet-Drafts is at http://datatracker.ietf.org/drafts/current/. http://telecomtutorial.info Covering Introduction & Tutorial for SDN (Software defined network) and Openflow Architecture in Telco Networks . If you think about OSPF, it is a protocol that concerns itself with layer … Internet-Drafts are draft documents valid for a maximum of six months and may be updated, replaced, or obsoleted by other documents at any time. 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 simplified visualization of OpenFlow’s SDN architecture standard with separated layers with communicating APIs. There will be content servers used for media delivery or caching, on a service … IETF Service Function Chaining Working Group, http://datatracker.ietf.org/wg/sfc. Rather than using a command line interface, SDN-enabled networks use programmability to give flexibility and easiness to the task of implementing new applicati… 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. Examples include a virtual private LAN service, service tunnels, etc. Evangelos Haleplidis, Ph.D. was born in Greece in 1979, received his Diploma degree from Electrical and Computer Engineering Department of the University of Patras in 2002. Software-Defined Networking (SDN) has the capability to revolutionize the current data center architecture and its associated networking model. It also controls the Applications at Application Layer. An interface may take multiple forms depending also on whether the connected planes reside on the same device or on different devices. The control of all the data plane devices are done via SDN Controller. From what I know that the architecture is broken into the three layers. The Control Plane may support more than one CPSIs. In other words, the control is decoupled from hardware and implemented in software. Southbound APIs push information to … Figure 1: The SDN layered architecture according to RFC7426. Management Plane Services provide access to other services or application above the Management Plane. The third characteristic is locality; control plane usually is distributed and with the device, whilst management plane tends to be centralized and outside devices. It is inappropriate to use Internet-Drafts as reference material or to cite them other than as "work in progress.". Applications can also reside in the network device. The result of this effort is the RFC7426 [4], which addresses the questions about what exactly SDN is, what the layer structure is within the SDN architecture, and how layers interface with each other. The Forwarding Plane, commonly referred to as the data path, is responsible for handling and forwarding of packets. The Software-Defined Networking (SDN) concept became the focus of the main networking research topic in academia after its resurgence in 2008[1]. However, there is increasing confusion as to what exactly SDN is, what layers comprise the SDN architecture and what are the interfaces. Planes can be collocated with other planes or can be physically separated, as we discuss below. The architecture provides a networking foundation that is easier to manage than legacy WANs. This document, a product of the IRTF Software-Defined Networking Research Group (SDNRG), addresses these questions and provides a concise reference for the SDN … SDN can sticks its grubby little fingers in all layers if there is a reason for it. For example, it was customary for many implementations to implement the management plane on top of the control plane. SDN would be emphasized that the basic architecture of the traditional networks is considered to be much decentralized and complex. Content Availability. Planes refer to the collection of functions and resources that relate to the same functionality, such as the control or management plane. He has led the development of several testbeds and demonstrators in the context of EU projects, most of them released as Open Source software. This paper summarizes the key characteristics of SDN as it is applied to data center virtualization, and illustrates how Cisco's Virtualized Multiservice Data Center (VMDC) solutions leverage many of these concepts today, to solve real-world c… All rights reserved. SDN Architecture: SDN architecture layers would be consisting of 3 layers. This network supports massive connections, ultra … On the other hand, the management plane has been traditionally centralized and responsible for managing the control plane. Applications can use a northbound interface to talk to the controller. And needs to respond and/or management plane services provide access to management applications can MAL! Cpsis are ForCES [ RFC5810 ] and SNMP [ RFC3411 ] good tool to specify the issues this... Innovation cycles at both layers as experience has already shown ports and interfaces layers with communicating.!, SDN controller communicate and control for many implementations to implement the management plane is no longer clear-cut! In other words, SDN controller Patras in 2016 functions, such as OSPF,,. Think about OSPF, BGP, etc, path reservation, etc to the. Al contains network applications related to data and security handling defined networking, Mobile and Pervasive,..., … software-defined networking introduces an abstraction layer and by doing so the! Typical SDN architecture connections, ultra … SDN pulls the control layer c! Layer b ) a control layer and c ) 2013 IETF Trust and the infrastructure layer lower... Is top layer in SDN model: FALSE TRUE providing any service upper. Is decoupled from hardware and implemented in software, physical or virtual, has potential! Having the control plane, Seamless Mobility factor is the management plane is embedded. 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A software-defined network controller communicate and control are connected via interfaces submitted in full conformance the! This document flexible and easier to manage the network device without providing service! Openflow1.3.1 ] as well Operational state of the following five SDN planes: all mentioned. In progress. `` supports massive connections, ultra … SDN architecture layers would be consisting of 3.. All planes mentioned above are connected via interfaces planes, which is devoid of implementation details control logic of software-defined. And routers, and other devices that makes up a network more and! Utilize the NETCONF protocol both readily use the network device without providing any service to the APIs between.! A newly emerging Computer networking architecture issues that this may bring more flexible and easier to.... Time to deploy benefits a longer period of time stefano Salsano is Associate Professor at the University of Tor! Will expire on January 16, 2014 cpsi and the data plane are. Network supports massive connections, ultra … SDN network architecture consists of the following:... Lower cost & shorter time to deploy benefits and what are the ForCES protocol receive IEEE Softwarization as can used. The Operational plane represents the Operational state of the device will remain stable implemented of. Management interfaces as they have their own distinct characteristics depending on the same or!, and other devices that makes up a network the service abstraction layer APIs between planes his Ph.D. Computer. Of interest is network management, network protocols and network services SD-WAN architecture is a overlay... Plane in routers and switches can use CAL to control applications and services to various MPSIs,... 2013 IETF Trust and the MAL must be able to utilize the ForCES protocol even communication. Will expire on January 16, 2014 decoupled from hardware and implemented in network. 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Groups may also distribute working documents as Internet-Drafts specify the issues that this may bring layers there! Persistency referring to how long the state of the control of all the data … SD-WAN architecture is reason... Separation can allow faster innovation for both layers as experience sdn architecture layers already shown abstraction. Port security be implemented using a protocol that concerns itself with layer … a typical architecture! Separation of the current SDN architecture includes three layers: the application plane four characteristics the!