US Patent 11973644 Distributed software-defined networking (SDN) control plane framework

A system includes a network of multiple network domains, each network domain includes a software defined network (SDN) controller. Each SDN controller includes a network interface circuitry, a processor and a memory. The network interface circuitry provides a communicative coupling with at least one domain of the multiple network domains. The memory includes instructions that when executed by the processor, performs a network update comprising adding links, subtracting links or reporting a status of links in at least one network domain upon receiving a network update request, and performs sending and receiving the network update request to a second SDN controller, where the network update request is part of real-time publish/subscribe protocol, the sending network update request includes a publish message having a specified topic and a set of QoS attributes, and the receiving a network update request includes subscribing to the specified topic and the set of QoS attributes.