This command will set your server as a hub server. This way you will be able to allow servers to connect to your server and allow downstream connections.
/as general set hub
A network is composed of hubs and leafs. The hubs should be the stablest servers with the best capacities. You should also generally limit the user count on the hub servers since they will be handling more information, holding the network together. The leaf servers work as client servers, supporting the majority of the user base. Hubs are the backbone of the network.