All about the 4.x SD WAN Routing Behaviour Part 1: Overlay Flow Control (OFC), Distributed Cost Calculation (DCC) and Lost Reason Codes
As already described in my Blog regarding Lost OFC Routes https://sd-wahn.blogspot.com/2022/01/where-have-all-ofc-routes-gone-or-my.html there were considerable routing behaviour changes starting with version 3.4.0 Excerpt from VMware SD-WAN Operator Guide Version 4.5 Configure Distributed Cost Calculation By default, the Orchestrator is actively involved in learning the dynamic routes. VMware SD-WAN Edges and Gateways rely on the Orchestrator to calculate initial route preferences and return them to the Edge and Gateway. The Distributed Cost Calculation feature enables you to distribute the route cost calculation to the Edges and Gateways. Note: Enabling Distributed Cost Calculation is recommended for all customers. This default method of involving the Orchestrator in both dynamic route calculation and the distribution of those routes to Edges and Gateways has drawbacks of significant higher route convergence time ...