Usage: CONNECT <connecting-server> <port> <destination-server>
Connects a server to another server. The servers at both ends of the connection being established must have defined each other properly in order for this command to succeed. The first server you type in is the split server, the second server is usually the hub server.
/connect server1.mynetwork.com 6667 server2.mynetwork.com
You can use this command to connect any split server with any server on the part of the network you are still connected to. However, unless the servers are configured to connect and one of them is a hub, it will not work.
You should be familiar with where the servers on your network usually connect before you try to connect two servers. Bad routing will create a slower network that is more likely to split.