If you've ever attended a networking demo or SD-WAN showcase, you’ve probably seen the classic "failover test." The presenter confidently pulls an Ethernet cable out of a router, exclaiming, "Watch this—our solution instantly switches to the backup path!" This flashy demonstration often draws applause, but behind the scenes, it’s a textbook example of smoke and mirrors.

Let’s break down why pulling an Ethernet cable is a poor simulation of real-world network failures, where most SD-WAN solutions falter. We'll also highlight how Fusion‘s SD-WAN stands out by delivering real-world-ready failover capabilities that ensure seamless performance, even under actual path failure scenarios.

The Smoke & Mirrors of Ethernet Failover Demos

Why Cable Unplugging Doesn't Reflect Reality

The act of unplugging an Ethernet cable might look dramatic, but it hardly simulates what businesses face in the wild. In real-world networking environments, failures rarely originate from a neatly disconnected cable at the edge device. Instead, they stem from:

Path Issues Upstream: Problems such as carrier outages, fibre cuts, or faulty equipment in the provider's network.
Intermittent Connectivity: Degradation, high latency, or packet loss that gradually worsens over time, instead of an abrupt disconnect.
Service Provider Failures: Routing loops, BGP misconfigurations, or overburdened peering points.

In these scenarios, the edge device doesn’t experience an instant "link down" event but rather continues to see a link as "up" while the path quality deteriorates or fails entirely upstream. This type of failure is far more insidious and harder for most SD-WAN solutions to detect.

Big Brand SD-WAN | The Struggle with Real Failures

Many big-name SD-WAN solutions, such as Fortinet and Meraki, excel in marketing but fall short in real-world failover scenarios. The root cause? Their inability to instantaneously detect path failures. Instead, they rely on periodic health checks (often every 1–5 seconds) to assess the quality of a path. This approach introduces several challenges:

Detection Delays: A 1-second probe interval is a lifetime for critical services like voice or video, leading to noticeable disruptions.
Session Drops: Applications like voice calls, video conferencing, or remote desktop sessions often disconnect before failover kicks in.
False Positives: SD-WAN solutions relying solely on periodic pings can misinterpret transient issues as failures, causing unnecessary path switching.

The end result? While the demo room theatrics may impress, the solution is often ill-equipped to handle the messy, unpredictable nature of real-world network issues.

Where Fusion SD-WAN Excels

Fusion SD-WAN takes a completely different approach to failover, prioritising real-time detection and seamless transitions. Here’s why it outshines the competition:

1. Instantaneous Path Failure Detection

Fusion's SD-WAN uses continuous, granular monitoring of all paths, enabling it to detect failures or degradation immediately. Unlike periodic health checks, it identifies issues within milliseconds, ensuring that failover occurs before applications or users even notice a problem.

2. Crystal-Clear Voice Performance

Voice over IP (VoIP) is one of the most sensitive applications to network disruptions. Fusion's real-time path monitoring ensures that voice calls are never dropped, even during a failover event. This is achieved through:

Sub-second Failover: Fusion reroutes traffic to a healthy path in real-time, preserving session integrity.
Optimised QoS: Voice traffic is prioritised, ensuring clarity and minimal jitter, even under heavy network load.

3. Application Session Continuity

Fusion SD-WAN is built to maintain session persistence during failover. Whether it’s a video conference, a file upload, or a remote desktop session, users remain connected without interruptions or re-authentication.

4. Intelligent Failover Simulation

Fusion doesn’t rely on the gimmick of pulling cables to demonstrate failover. Instead, it employs realistic failure simulations, such as introducing packet loss, high latency, or complete path degradation upstream. These tests showcase the solution's ability to handle real-world scenarios, giving businesses confidence in its capabilities.

The Importance of Real-World-Ready Failover

Failover is more than just a checkbox on a datasheet—it’s a critical feature that can make or break user experience. Businesses depend on their networks to support mission-critical applications, including:

Voice and Video: Dropped calls and frozen video streams can result in lost opportunities and frustrated customers.
Cloud Applications: Disruptions to SaaS platforms can cripple productivity.
E-commerce: Even a momentary outage can lead to lost sales and reputational damage.

With Fusion SD-WAN, businesses gain a solution that’s ready for the real world, not just the demo room. Its ability to detect and respond to upstream path failures ensures uninterrupted service and superior application performance, no matter the challenge.

Wrap

Pulling an Ethernet cable may make for an eye-catching demo, but it’s a far cry from the complexities of real-world network failures. Solutions like Fortinet and Meraki struggle with upstream path issues, leaving businesses vulnerable to service disruptions.

Fusion’s SD-WAN, on the other hand, delivers failover that works where it matters most: in the unpredictable and often chaotic reality of enterprise networking. By combining instantaneous path failure detection, session continuity, and crystal-clear voice performance, Fusion ensures that businesses stay connected, productive, and resilient.

So next time you see someone unplug an Ethernet cable as proof of failover, remember: it’s just a show. True reliability happens upstream—and that’s where Fusion shines.

🚬Why SD-WAN Failover Demos with Ethernet Cables being Unplugging Are Just Smoke & Mirrors💨