How do I use the Time Machine command line interface to backup to an internal ip server? I have a Time Machine server which uses a manually defined internal ip (not dhcp assigned.) It is using 169.254.x.x this case. 

How do I use the Time Machine command line interface to configure backups?

UPDATE: The Time Machine Server is a QNAP NAS server. I make the DHCP off on my router. I am able to connect to it via 169.254.x.x to the server either. 

I can't get known the Time Machine on the client site via the Time Machine client tool. So, I just wonder to use cli to connect to the Time Machine server. 

I make an explanation for that.
To configure a client to backup to a remote server, you use the tmutil command, and the setdestination verb.

tmutil setdestination afp://user[:pass]@169.254.x.x/share


This also assumes that you have share already existing as an AFP share on your TimeMachine server.

TimeMachine from client-side doesn't really care much about the remote server, except to mount the AFP volume.