Prisma SD-WAN traffic exclusively uses active paths when multiple paths are established from the Branch to the Data Center (DC). A Branch ION has active tunnels to one DC ION and standby tunnels to the second DC ION in the DC ION HA pair. Backup paths are on standby and ready to activate in case of link or BGP peer failures at the active DC ION device, ensuring uninterrupted service. By enabling Host Reachability Tracking, you can effectively monitor LAN connections with a tracker that provides consistent connectivity. As long as the DC ION device can reach the designated IP address, tunnels can remain active on the ION, and traffic will remain on the active links to this ION. However, if the tracker fails—indicating a loss of IP reachability—the system will promptly switch between active and backup paths as necessary, demonstrating its proactive response to potential issues.

Prisma SD-WAN traffic rerouting is seamless, ensuring uninterrupted service despite core network connectivity failures. When such issues arise, the system seamlessly redirects traffic to alternative overlay paths within the same data center, maintaining service continuity and enhancing network resilience.

As a result, the branches proactively reroute their traffic to the core network through alternative routes. This approach effectively prevents potential traffic black holes, ensuring continuous and reliable network operation.