vBond functions: 1. vBond is the orchestrator and the gatekeeper. 2. vBond validates that the vEdge trying to join the overlay is authorized to join or not. 3. vBond Orchestrates the connectivity between vEdge routers and vSmart controllers. 4. Ensures that valid vEdge routers can build the control plane connectivity. 5. vEdge builds temporary connectivity with vBond until the vEdge forms connectivity with the vSmart. https://www.prosdn.com/viptela-cisco-sd-wan-components-overview/