Which SD-WAN topology configuration allows immediate failover to standby?

The Active-Standby configuration in an SD-WAN topology is designed specifically for scenarios where immediate failover is critical. In this configuration, one device operates as the primary (active) connection while the other is kept in a standby state. This setup ensures that if the primary device fails or encounters an issue, the standby device can take over almost instantly, allowing for minimal downtime and disruption in connectivity.

While other configurations, such as Active-Active or Load Balancing, also provide redundancy, they do not guarantee the same immediate response when a failure occurs. In Active-Active configurations, multiple devices are actively processing traffic simultaneously, which can provide improved performance but may complicate failover. Dynamic Routing helps with rerouting traffic in the network but does not inherently provide a dedicated standby device for immediate failover.

Thus, the Active-Standby option is specifically designed to address the requirement for immediate failover to ensure continuous service availability in the event of a link or device failure.