SD-WAN was invented to help enterprises transition away from higher-cost, inflexible WAN links to lower-cost broadband links, by being able to bring better resiliency across multiple broadband connections.
SD-WAN facilitated the transition from on-premises based applications to cloud-based applications and supported technologies such as Direct Internet Access so that branches could connect directly to cloud and SaaS applications instead of being routed through the data center first.
In 2020, SD-WAN had to evolve quickly to support the acceleration of public cloud and SaaS-based applications to facilitate work from anywhere. Multi-cloud support is critical because it is estimated that the average enterprise is using well over 1,000 cloud or SaaS-based applications.
Also in 2020, SD-WAN had adapted to support the transition from working in the office to working from home. This led to new features and new SD-WAN appliances for at-home power workers.
The need for increased mobility and the transition of SD-WAN to support both fixed and mobile use cases converge with the continued build-out of 5G networks. Meanwhile, SD-WAN technology must adapt to Wireless WANs, similarly to how it adapted to broadband, the cloud, and remote work.
Organizations with lots of widely distributed stores or branch offices can meet most of their edge networking needs through one solution by deploying a hybrid WAN router that includes cloud-managed SD-WAN features; multiple types of WAN connections; two cellular modems; Wi-Fi; and zero trust network access (ZTNA) technologies. This is the most efficient and scalable way to support SD-WAN capabilities and 5G or LTE amid a rapid expansion of fixed sites.
Network admins and fleet managers can address their mobility challenges and satisfy ever-rising bandwidth demands in vehicles by installing ruggedized dual-modem routers that facilitate automatic, application-based traffic steering between different carriers based on factors such as signal strength, latency, jitter, and data usage. The use of 5G and LTE SD-WAN in vehicles will become more common as digital transformation and connected technologies for fleets continue to expand.
With the right SD-WAN features in place, organizations can set up intelligent traffic steering to various packet data networks (PDNs) over LTE or, in the future, to various 5G network slices. Only one modem is needed for these configurations, making it easier to scale the type of scenario-specific quality of experience that businesses need amid fast-moving Wireless WAN growth.
One of the most anticipated 5G features is network slicing, offering organizations distinctive levels of end-to-end performance across cellular networks. With mass 5G standalone deployments on the horizon, 5G-optimized SD-WAN will play a key role of recognizing, classifying, and steering corporate applications into the most appropriate carrier-defined network slice from the enterprise edge.
In networking, traffic steering is an SD-WAN feature that improves quality of service by automatically identifying, labeling, and sending network traffic through the highest-performing WAN link. Traffic steering uses businesses policies to assign individual enterprise business applications to a single interface (Ethernet) or a group of interfaces consisting of MPLS, wired broadband, cellular, or Wi-Fi as WAN. Traffic steering is based on networks factors including signal strength, latency, jitter, and data usage.
Traditionally known as a strategy for wired networks, SD-WAN solutions have progressed and now include the ability to optimize multiple types of WAN links, including 5G and LTE. When delivered through a vendor that provides a hybrid WAN router, cloud-delivered service gateway and advanced SD-WAN capabilities, an enterprise can achieve SD-WAN traffic steering — based on latency, loss, jitter, bandwidth, and data usage — involving both wired and wireless connections.
Enterprises use SD-WAN technologies to direct specific traffic to LTE PDNs and 5G network slices — the latter only being available via 5G networks with a standalone core. However, how does networking slicing work? The slices are customized for specific use case based on differing needs regarding throughput, latency, coverage, speed, reliability, security, and more from end to end. According to 3GPP, types of network slices include eMBB for high throughput and low latency; URLLC for exceptional reliability and availability and ultra-low latency; and mMTC or cMTC for minimal, low-bandwidth IoT data