Methods, systems, and computer programs are presented for managing a global network topology. One method includes an operation for generating, by a network device, a local topology identifying which network entities are connected to each external port of the network device. The network device is configured to execute a network device operation system (ndOS), and the network device is configured to share information associated with the local topology with other ndOS network devices that execute ndOS. Further, the method includes an operation for receiving one or more remote local topologies from respective one or more ndOS network devices. The network device generates a global topology based on the local topology and the one or more remote local topologies, where the global topology is shared by the network device and the ndOS network devices executing ndOS, and the global topology identifies which entities are connected to one or more of the ndOS network devices.