The growing digitalization of industries like automotive, transportation, urban mobility, and telecommunications is highlighting the significance of point-to-multipoint communication services. These services are essential for tasks like maximizing the efficiency of hardware and software resources and ensuring that users consistently receive software updates and communications. In order to implement precise and dependable point-to-multipoint distribution services within the network, software-defined networking is used. SDN controllers like RYU, Floodlight, and others have become the de facto standard for operating these kinds of networks. An SDN multi-controller's efficiency greatly affects the underlying SDN infrastructure network's adaptability and capabilities. This research makes use of a Mininet emulator to develop a multi-controller SDN architecture with a Fat-Tree topology and two RYU controllers. Throughput, latency, and roundtrip time are some of the node-to-node performance measures that will be used to determine how successful a Domain Isolation Multi-controller (DiM) network architecture is. DiM has higher throughput and round-trip time than other multi-controller algorithms. DiM is 21% faster than HyperFlow, Kandoo, and Rama at 19.99 Gbps. DiM cuts RTT by 44%, 25%, and 86% compared to HyperFlow, Kandoo, and Rama. ONOS has a slightly lower RTT (10.0 ms) than DiM (11.25 ms), but the difference is small, and DiM matches ONOS in throughput. DiM latency matches other multi-controller methods. DiM high throughput and low RTT make it ideal for scalable and responsive SDN environments. © 2013 IEEE.