Simple definition
A technology that controls multiple accesses WAN based on the quality of the links and the application needs.
Technical definition
Software-Defined WAN applies centralized rules for path selection based on metrics such as latency, loss, gigue or availability.
What is it used for ?
Divide traffic between fiber, xDSL, 4G/5G or multiple operators and improve service continuity.
Practical example
One firewall can send the VoIP on the fiber and automatically switch to 5G if the quality is degraded.
Common issues
- Poorly configured quality probes
- Conflicting priority rules
- Switch to change public IP address
Related terms
Key takeaway: This entry explains the general operation of the term. Exact settings may vary depending on software, vendors and environments.