444:, the name given to the collection of techniques used to increase data-transfer efficiencies across WANs. The goal of each is to accelerate application delivery between branch offices and data centers, but SD-WAN technology focuses additionally on cost savings and efficiency, specifically by allowing lower cost network links to perform the work of more expensive leased lines, whereas WAN Optimization focuses squarely on improving packet delivery. An SD-WAN utilizing virtualization techniques assisted with WAN Optimization traffic control allows network bandwidth to dynamically grow or shrink as needed. SD-WAN technology and WAN optimization can be used separately or together, and some SD-WAN vendors are adding WAN optimization features to their products.
235:
are associated. The grouping of application flows based on a common type, e.g., conferencing applications, is referred to as an
Application Flow Group in MEF 70. Per MEF 70, the SD-WAN Edge classifies incoming IP packets at the SD-WAN UNI (SD-WAN user network interface), determines, via OSI Layer 2 through Layer 7 classification, which application flow the IP packets belong to, and then applies the policies to block the application flow or allow the application flows to be forwarded based on the availability of a route to the destination SD-WAN UNI on a remote SD-WAN Edge. This helps ensure that application performance meets
387:(CLI) methods of configuration and control. Other beneficial administrative features include automatic path selection, the ability to centrally configure each end appliance by pushing configuration changes out, and even a true software defined networking approach that lets all appliances and virtual appliances be configured centrally based on application needs rather than underlying hardware.
111:
power made it possible to create software-based appliances that were able to analyze traffic and make informed decisions without delays, making it possible to create large-scale overlay networks over the public
Internet that could replicate all the functionality of legacy WANs, at a fraction of the cost.
358:
Most SD-WAN products are available as pre-configured appliances, placed at the network edge in data centers, branch offices and other remote locations. There are also virtual appliances that can work on existing network hardware, or the appliance can be deployed as a virtual appliance on the cloud in
106:
Independent of safety concerns, connectivity to the
Internet became a necessity to the point where every branch required Internet access. At first, due to safety concerns, private communications were still done via WAN, and communication with other entities (including customers and partners) moved to
477:
Cloud-based SD-WAN offers advanced features, such as enhanced security, seamless cloud, and support for mobile users, that result naturally from the use of cloud infrastructure. As a result, cloud-based SD-WAN can replace MPLS, enabling organizations to release resources once tied to WAN investments
410:
SD-WAN is a core component of secure access service edge solutions (SASE) which incorporate network and security capabilities to more efficiently and securely connect distributed work environments (branch office, headquarters, home office, remote) to distributed applications located in data centers,
395:
With a global view of network status, a controller that manages SD-WAN can perform careful and adaptive traffic engineering by assigning new transfer requests according to current usage of resources (links). For example, this can be achieved by performing central calculation of transmission rates at
207:
The SD-WAN edge is a physical or virtual network function that is placed at an organization's branch/regional/central office site, data center, and in public or private cloud platforms. MEF Forum has published the first SD-WAN service standard, MEF 70 which defines the fundamental characteristics of
183:
SD-WAN products are designed to address these network problems. By enhancing or even replacing traditional branch routers with virtualization appliances that can control application-level policies and offer a network overlay, less expensive consumer-grade
Internet links can act more like a dedicated
139:
WANs allow companies to extend their computer networks over large distances, connecting remote branch offices to data centers and to each other, and delivering applications and services required to perform business functions. Due to the physical constraints imposed by the propagation time over large
98:
The need for strict control, security and quality of service (QOS) meant that multinational corporations were very conservative in leasing and operating their WANs. National regulations restricted the companies that could provide local service in each country, and complex arrangements were necessary
78:
Legacy WANs allowed communication over circuits connecting two or more endpoints. Earlier networking supported point-to-point communication over a slow speed circuit, usually between two fixed locations. As networking progressed, WAN circuits became faster and more flexible. Innovations like circuit
509:
IT website divides the SD-WAN vendor market into three groups: established networking vendors who are adding SD-WAN products to their offerings, WAN specialists who are starting to integrate SD-WAN functionality into their products, and startups focused specifically on the SD-WAN market. The global
459:
is a device that routes data packets between different WAN locations, giving enterprise access to a carrier network. Also called a boundary router, it is unlike a core router, which only sends packets within a single network. SD-WANs can work as an overlay to simplify the management of existing WAN
537:
MEF 70 standardizes SD-WAN service attributes and uses standard IPv4 and IPv6 routing protocols. SD-WAN services also use standard IPsec encryption protocols. Additional standardization for other SD-WAN functions and related security functionality not covered in MEF 70 are under development at the
234:
The SD-WAN controller functionality, which can be placed in the orchestrator or in an SD-WAN gateway, is used to make forwarding decisions for application flows. Application flows are IP packets that have been classified to determine their user application or grouping of applications to which they
74:
WANs were very important for the development of networking in general and for a long time one of the most important applications of networks both for military and enterprise applications. The ability to communicate data over long distances was one of the main driving factors for the development of
490:
As there is no standard algorithm for SD-WAN controllers, device manufacturers each use their own proprietary algorithm in the transmission of data. These algorithms determine which traffic to direct over which link and when to switch traffic from one link to another. Given the breadth of options
42:
If standard tunnel setup and configuration messages are supported by all of the network hardware vendors, SD-WAN simplifies the management and operation of a WAN by decoupling the networking hardware from its control mechanism. This concept is similar to how software-defined networking implements
110:
As the
Internet grew in reach and maturity, companies started to evaluate how to leverage it for private corporate communications. During the early 2000s, application delivery over the WAN became an important topic of research and commercial innovation. Over the next decade, increasing computing
216:
SD-WAN gateways provide access to the SD-WAN service in order to shorten the distance to cloud-based services or the user, and reduce service interruptions. A distributed network of gateways may be included in an SD-WAN service by the vendor or setup and maintained by the organization using the
521:
groups SD-WAN vendors into categories based on their original technology space, and which are "Pure-play SD-WAN providers", "WAN optimization vendors", "Link-aggregation vendors", and "General network vendors". While
Network World's second category (startups focused specifically on the SD-WAN
130:
Networking publications started using the term SD-WAN to describe this new networking trend as early as 2014. With the rapid shift to remote work as a result of lockdowns and stay at home orders during the COVID-19 pandemic, SD-WAN grew in popularity as a way of connecting remote workers.
225:
The SD-WAN orchestrator is a cloud hosted or on-premises web management tool that allows configuration, provisioning and other functions when operating an SD-WAN. It simplifies application traffic management by allowing central implementation of an organization's business policies.
313:
by having application level awareness, giving bandwidth priority to the most critical applications. This may include dynamic path selection, sending an application on a faster link, or even splitting an application between two paths to improve performance by delivering it faster.
65:
When SD-WAN traffic is carried over the
Internet, there are no end-to-end performance guarantees. Carrier MPLS VPN WAN services are not carried as Internet traffic, but rather over carefully-controlled carrier capacity, and do come with an end-to-end performance guarantee.
468:
SD-WANs are similar to hybrid WANs, and sometimes the terms are used interchangeably, but they are not identical. A hybrid WAN consists of different connection types, and may have a software defined network (SDN) component, but doesn't have to.
481:
An overview discussing three typical reasons to compare MPLS with SD-WAN. Specifically where IT teams need to retain MPLS due to contract commitments and where the
Enterprise migrates from MPLS to an Internet-based SD WAN.
114:
SD-WAN combines several networking aspects to create full-fledged private networks, with the ability to dynamically share network bandwidth across the connection points. Additional enhancements include central controllers,
427:), Firewall, and other capabilities to connect and protect users and applications. In December 2021, Gartner research firm estimated that by 2025, 50% of SD-WAN purchases will be part of a single vendor SASE offering.
538:
MEF Forum. There are several opensource SD-WAN solutions and opensource SD-WAN implementations available. For example, the Linux
Foundation has three projects that intersect with and help the SD-WAN market:
292:
Features of SD-WANs include resilience, quality of service (QoS), security, and performance, with flexible deployment options; simplified administration and troubleshooting; and online traffic engineering.
103:, which permitted entities around the world to connect to each other. However, over the first years, the uncontrolled nature of the Internet was not considered adequate or safe for private corporate use.
529:
strategy of connectivity providers entering the SD-WAN market. These providers include "Network-as-a-service vendors", "Carriers or telcos", "Content delivery networks" and "Secure WAN providers".
491:
available in relation to both software and hardware SD-WAN control solutions, it's imperative they be tested and validated under real-world conditions within a lab setting prior to deployment.
140:
distances, and the need to integrate multiple service providers to cover global geographies (often crossing nation boundaries), WANs face important operational challenges, including
522:
market), is generally equivalent to
Nemertes' "Pure-play SD-WAN providers" category, Nemertes offers a more detailed view of the preexisting WAN and overall networking providers.
301:
A resilient SD-WAN reduces network downtime. To be resilient, the technology must feature real-time detection of outages and automatic switch over (fail over) to working links.
51:
management and operation. In practice, proprietary protocols are used to set up and manage an SD-WAN, meaning there is no decoupling of the hardware and its control mechanism.
1121:
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data communications, as it made it possible to overcome the distance limitations, as well as shortening the time necessary to exchange messages with other parties.
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498:
appliances which can apply specified network impairments to the network being tested in order to reliably validate performance, to software-based solutions.
777:
363:(SaaS). This allows enterprises to benefit from SD-WAN services as they migrate application delivery from corporate servers to cloud based services such as
180:. It can be expensive and difficult to expand WAN capability, with corresponding difficulties related to network management and troubleshooting.
692:
977:
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cloud infrastructure, or delivered by SaaS services. With SASE, SD-WAN is combined with other network and security technologies including
632:
581:
847:
54:
A key application of SD-WAN is to allow companies to build higher-performance WANs using lower-cost and commercially available
951:
460:
edge routers, by lowering dependence on routing protocols. SD-WAN can also potentially be an alternative to WAN Edge routers.
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has defined an SD-WAN architecture consisting of an SD-WAN edge, SD-WAN gateway, SD-WAN controller and SD-WAN orchestrator.
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58:, enabling businesses to partially or wholly replace more expensive private WAN connection technologies such as
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SD-WAN market stood at $ 3.25 billion in 2021 and the market is expected to grow 30% in 2022. According to
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service. By sitting outside the headquarters in the cloud, the gateway also reduces headquarters traffic.
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32:
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119:, integrated analytics and on-demand circuit provisioning, with some network intelligence based in the
84:
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Additionally, Nemertes Research also describes the in-net side of the SD-WAN market, describing the
1396:
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environments such as Amazon Web Services (AWS), Unified Communications as a service (UCaaS) or as
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177:
1122:"Oracle's Purchase of Talari Makes It the First Major Public Cloud Provider to Offer SD-WAN"
543:
420:
283:, and third party services such as WAN optimization controllers, firewalls and web gateways
607:
8:
247:Π’he Gartner research firm has defined an SD-WAN as having four required characteristics:
1236:"QuickCast: Fast and Efficient Inter-Datacenter Transfers using Forwarding Tree Cohorts"
494:
There are multiple solutions available for testing purposes, ranging from purpose-built
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310:
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36:
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the controller and rate-limiting at the senders (end-points) according to such rates.
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28:
176:. Bandwidth requirements are also increasing, especially for applications featuring
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441:
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273:
The ability to do dynamic path selection, for load sharing and resiliency purposes
95:) allowed communication to become more dynamic, supporting ever-growing networks.
161:
120:
55:
1419:"SD-WAN Market Research Report, Analysis And Forecast Till 2030 - DataVagyanik"
364:
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44:
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to establish truly global networks. All that changed with the growth of the
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338:, storing recently accessed information in memory to speed future access.
848:"How fast should my Internet connection be to watch streaming HD movies?"
453:
173:
149:
48:
514:
Datavagyanik, North America accounted for more than 77% of the market.
39:
which are encrypted when destined for internal organization locations.
196:
1221:"DCCast: Efficient Point to Multipoint Transfers Across Datacenters"
350:(AIOps) for continuous troubleshooting and fixes to network issues.
187:
SD-WAN products can be physical appliances or software based only.
184:
circuit. This simplifies the setup process for branch personnel.
100:
35:
technology, such as communicating over the Internet using overlay
368:
1309:"Citrix Combines SD-WAN, WAN Optimization In Single Appliance"
778:"How to address WAN jitter issues for real-time applications"
323:
208:
an SD-WAN service plus service requirements and attributes.
539:
424:
252:
153:
92:
80:
59:
826:"Low-latency networks aren't just for Wall Street anymore"
251:
The ability to support multiple connection types, such as
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280:
152:, and even service outages. Modern applications such as
1203:"Guaranteeing Deadlines for Inter-Datacenter Transfers"
276:
A simple interface that is easy to configure and manage
267:
260:
978:"SD-WAN as a Service Using Orchestration β Definition"
1167:"Achieving High Utilization with Software-Driven WAN"
1026:"Do wide area networks need to get software-defined?"
374:
1234:
M. Noormohammadpour; et al. (January 1, 2018).
804:"What's slowing down your network and how to fix it"
399:
1233:
1218:
721:
719:
717:
582:"SD-WAN: What it is and why you'll use it one day"
1219:M. Noormohammadpour; et al. (July 1, 2017).
435:
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440:There are some similarities between SD-WAN and
334:SD-WANs can improve application delivery using
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944:
942:
749:"The rise and rise of SD-WAN in post Covid-19"
322:SD-WAN communication is usually secured using
1062:
867:
865:
390:
259:or through high speed cellular networks e.g.
1183:S. Kandula; et al. (February 1, 2016).
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1018:
952:"What is the purpose of an SD-WAN gateway?"
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892:
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463:
430:
329:
242:
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1048:"How IPsec provides secure communications"
862:
600:
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1144:"Difference Between GUI and Command Line"
1095:"The coming together of SD-WAN and AIOps"
729:. networkcomputing.com. September 9, 2014
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485:
348:artificial intelligence for IT operations
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1200:
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1087:
925:"SD-WAN Service Attributes and Services"
887:
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341:
1165:C. Hong; et al. (August 1, 2013).
1164:
1006:. networkcomputing.com. August 27, 2015
693:"Understanding SD-WAN Managed Services"
633:"A Brief History of the Enterprise WAN"
1438:
1276:
1258:"Network Predictions: Past and Future"
818:
379:As with network equipment in general,
220:
1375:"SD-WAN vs. MPLS vs. Public Internet"
1120:Hardesty, Linda (December 20, 2018).
1075:. packetpushers.net. January 17, 2020
919:
917:
915:
850:. HowStuffWorks.com. October 31, 2011
472:
353:
304:
79:and packet switching (in the form of
1185:"Calendaring for Wide Area Networks"
970:
686:
684:
682:
680:
546:, and the Tungsten Fabric (formerly
517:Alternatively, a market overview by
229:
1311:. packetpushers.com. March 16, 2016
806:. computerweekly.com. April 1, 2015
447:
13:
1377:. Cato Networks. February 28, 2018
912:
423:(DLP), Zero Trust Network Access (
375:Administration and troubleshooting
21:Software-Defined Wide Area Network
16:Software-defined wide area network
14:
1482:
1146:. differencebtw.com. May 29, 2015
691:Santitoro, Ralph (July 1, 2017).
677:
400:Secure access service edge (SASE)
211:
1397:"How to compare SD-WAN vs MPLS?"
1004:"SD-WAN Vendors Making A Splash"
900:. nojitter.com. November 2, 2015
898:"SD-WAN: Bringing WAN Sexy Back"
727:"Software-Defined WAN: A Primer"
1411:
1389:
1367:
1345:
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1301:
1287:"SD-WAN (software-defined WAN)"
1227:
1212:
1194:
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1136:
1113:
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873:"SD-What? Understanding SD-WAN"
840:
1201:H. Zhang; et al. (2015).
796:
770:
651:
625:
532:
501:
436:SD-WAN versus WAN optimization
202:
1:
553:
478:and create new capabilities.
296:
257:last mile fiber optic network
190:
93:Multiprotocol Label Switching
413:cloud access security broker
326:, a staple of WAN security.
7:
828:. gigaom.com. April 6, 2012
317:
309:SD-WAN technology supports
287:
134:
33:software-defined networking
10:
1487:
406:Secure access service edge
403:
391:Online traffic engineering
69:
1331:"Definition: edge router"
927:. MEF Forum. July 1, 2019
1451:Configuration management
1073:"List of SD-WAN Vendors"
464:SD-WAN versus hybrid WAN
431:Complementary technology
346:SD-WANs can incorporate
330:Application optimization
243:Required characteristics
237:service level agreements
166:virtualized applications
1353:"Definition hybrid WAN"
766:(subscription required)
279:The ability to support
123:, allowing centralized
117:zero-touch provisioning
486:Testing and validation
385:command line interface
146:packet delay variation
47:technology to improve
1446:Computing terminology
361:Software as a Service
342:Self-healing networks
270:wireless technologies
178:high-definition video
1461:Network architecture
544:OpenDaylight Project
512:SD-WAN market Report
421:Data Loss Prevention
383:may be preferred to
608:"wide area network"
588:. February 10, 2016
221:SD-WAN orchestrator
1471:Wide area networks
1466:Telecommunications
1264:. December 7, 2021
1223:. USENIX HOTCLOUD.
984:. December 5, 2016
784:. October 22, 2012
659:"Managing the WAN"
473:SD-WAN versus MPLS
417:Secure Web Gateway
354:Deployment options
311:quality of service
305:Quality of service
142:network congestion
1456:Data transmission
550:' OpenContrail).
519:Nemertes Research
496:network emulation
230:SD-WAN controller
158:videoconferencing
125:policy management
89:Internet Protocol
29:wide area network
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665:. March 13, 2006
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1238:. IEEE INFOCOM
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1208:. ACM EUROSYS.
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1190:. ACM SIGCOMM.
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1172:. ACM SIGCOMM.
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533:Open source
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203:SD-WAN edge
174:low latency
150:packet loss
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1440:Categories
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612:Britannica
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297:Resilience
191:Components
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197:MEF Forum
156:calling,
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336:caching
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371:apps.
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164:, and
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324:IPsec
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1361:2016
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540:ONAP
454:edge
425:ZTNA
381:GUIs
367:and
281:VPNs
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