Whether users are looking to stabilize cloud-connected resources, better manage remote networks or simply upgrade a timeworn wide area environment, software-defined-WAN (SD-WAN) technologies are what’s on the purchasing menu.
The proof lies in the fact that this segment of the networking market will hit US$4.5 billion and grow at a 40.4% compound annual growth rate from 2017 to 2022. In 2017 alone, SD-WAN infrastructure revenues increased 83.3% in 2017 to reach $833 million, according to IDC's recent SD-WAN Infrastructure Forecast.
A related report from researchers at the Dell’Oro Group predicts revenue from SD-WAN software components, including controller and virtual network functions, will grow almost twice as fast as the hardware components. Over the next five years, SD-WAN software revenue will grow at a 41% compounded annual growth rate, compared to 21% for hardware.
The speed of SD-WAN adoption is one of the most surprising aspects of the forecast, said Brandon Butler a senior analyst with IDC. “The SD-WAN market is really in the early stages and we expect to see significant growth through 2022.”
IDC found that as enterprise customers add SaaS and IaaS services they will increasingly look to SD-WAN as a way of “intelligently automating how application traffic is delivered to branch sites, moving away from traditional hub-and-spoke WAN architectures and the backhauling of internet- and cloud-bound traffic to on-premises datacenters toward the increasing use of broadband internet breakout and other network transports – 4G/LTE and 5G – at the branch for cost-effective application delivery.”
Users looking to upgrade and optimize their wide area network for MPLS, cellular and broadband will find it a lot easier to do with SD-WAN, Butler said.
Lowering costs by not having customers buy new hardware and by easily supporting less expensive connectivity, either via the Internet, Ethernet or LTE are important potential benefits of SD-WAN.
“Users have diverse workload environments be they mobile or cloud, and SD-WAN helps bring those environments closer together,” Kiran Ghodgaonkar, Cisco senior manager of enterprise marketing told Network World recently. “With the increased use of multi-cloud services especially, the WAN is really becoming the backbone of the enterprise.”
IDC offered up a number of other reasons SD-WAN technologies are heating up, including analytics and management.
Network infrastructure vendors are increasingly introducing analytics capabilities such as performance benchmarking and user analysis that can lead to more informed deployment and security decisions. These visibility, analysis, security and optimization tools are increasingly being applied to SD-WAN products, IDC wrote.
Increasingly, networking vendors integrate software tools that includes centralized management of enterprise campus and remote/branch office sites. While LAN and WAN networks are still largely managed separately, IDC expects in the coming years that some networking vendors will focus on integrating management of these environments, either through building out their own offerings or partnering with others, IDC wrote.
As customers adopt SD-WAN technologies there issues that could cause some trepidation.
“A lack of consistent pricing structures could slow SD-WAN adoption. Vendors’ pricing and feature sets vary widely, and this makes it difficult to assess the economic value of solutions,” Dell’Oro ‘s Umeda said. “Also, the large software component of SD-WAN shifts spending to a long-term recurring operating expense from a one-time capital expense.”
Another issue is security. Users need to make sure what’s being offered by specific vendors and evaluate their requirements.
Researchers at Ovum wrote “many SD-WAN vendors are offering foundational security options versus listing them as roadmap items. Customers can easily service chain more robust security features by location, session, user, and application. This capability is just one example of the improved security that can be provided with advanced SD-WAN implementations.”
Umeda said that as he definition of SD-WAN is evolving, security is becoming a requirement. “Because many SD-WAN users rely on unsecure Internet connectivity, integrated security is needed to ensure traffic protection," he said.
IDC’s Butler said that security features will be a large component of SD-WAN offerings and that vendors will rapidly add security features and enter into partnerships to bolster security packages.
“By including security tools natively in networking platforms, networking vendors are shaking up buyer dynamics by essentially forcing network decision makers and security decision makers to be on the same page from early in the network infrastructure procurement process. While only a portion of vendors offer these solutions today, IDC expects this number to grow steadily in the coming years,” IDC wrote.
According to IDC, Cisco holds the largest share in the SD-WAN market. Cisco's market share stood at 49.3% in 2017, down from 63.1% in 2016. In August 2017 Cisco purchased Viptela, which was one of the leading SD-WAN startups.
Cisco recently took a giant step in its SD-WAN development by adding Viptela's SD-WAN technology to Cisco IOS XE software that runs its core ISR/ASR routers. Over a million of ISR/ASR edge routers, such as the ISR models 1000, 4000 and ASR 5000 are in use by organizations worldwide.
VMware, meanwhile, comes in second with a 10.4% SD-WAN marketshare in 2017, up from 7.8% in 2016, according to IDC, which noted that the company purchased VeloCloud in December 2017 when it was one of the larger pure-play SD-WAN startups.
"With VeloCloud now rolled into VMware, the company is working toward offering an integrated multi-cloud networking platform that spans NSX network virtualization in the data center(s) and extends out to VeloCloud in the branch and remote office, which the company has rebranded VMware NSX SD-WAN,” IDC said.