This command will set your server as a leaf server. This will allow you to connect to a hub server.
/as general set leaf
A leaf can only connect to one server. It will not have to handle as much network traffic as a hub server, so it should be able to handle more clients. If it splits off then only the users on that server are separated from the network until it reconnects. If it dies then the users can reconnect onto another server, but the network is not split. A network will usually have many more leafs than hubs, usually at least twice as many unless it has a small number of servers.