How to connect two servers openfire..?

I need to know how I can have two openfire servers in different places and that can be seen between them.? Both users server “A” may see users “B” server and “B” server “A” server. I followed to the letter the instructions shown in various forums add the IP address of each server in the Server> Server Settings> Route Server Server Enabled and have left the service as must leave. If I go to sessions and server sessions then I says “No sessions initiated”. Help …!