Link monitoring and failover

Performance SLA link monitoring measures the health of links that are connected to SD-WAN member interfaces by sending probing signals through each link to a server, and then measuring the link quality based on latency, jitter, and packet loss. If a link is broken, the routes on that link are removed and traffic is routed through other links. When the link is working again, the routes are re-enabled. This prevents traffic being sent to a broken link and lost.