SD-WAN - vBond
vBond is the orchestrator. It authenticates vSmart controllers and vEdge routers and coordinates connectivity between them. It tells vEdge routers where and how to connect to vManage and vSmart controllers. vBond requires a public IP address so that all devices can connect to it. When a vEdge router joins the SD-WAN, the first thing it talks to is the vBond orchestrator.
Links
https://networklessons.com/cisco/cisco-sd-wan/introduction-to-sd-wan#vBond