The DTLS connections with Cisco vSmart Controllers are permanent so that the vBond controller can inform the Cisco vSmart Controllers as edge routers join the network. The DTLS connections with edge routers are temporary; once the Cisco vBond Orchestrator has matched a edge router with a Cisco vSmart Controller, there is no need for the Cisco vBond Orchestrator and the edge router to communicate with each other. Reference: https://www.cisco.com/c/en/us/td/docs/routers/sdwan/configuration/sdwan-xe-gs- book/system-overview.html