https://www.cisco.com/c/en/us/td/docs/routers/sdwan/configuration/bridging-routing- segmentation-qos/vedge/bridging-routing-segmentation-qos-book/multicast-overlay-routing.html Replicators For efficient use of WAN bandwidth, strategic vEdge routers can be deployed and configured as replicators throughout the overlay network. Replicators mitigate the requirement for an ingress router to replicate a multicast stream once for each receiver.