ypset —
tell 
ypbind(8)
  which NIS server process to use
  
    | ypset | [ -hhost]
      [-ddomain]
      server | 
ypset tells the
  ypbind(8) process on the current
  machine which NIS server process to communicate with. If
  server is down or is not running a NIS server process,
  it is not discovered until a NIS client process attempts to access a NIS map,
  at which time ypbind(8) tests
  the binding and takes appropriate action.
ypset is most useful for binding a NIS
    client that is not on the same broadcast network as the closest NIS server,
    but can also be used for debugging a local network's NIS configuration,
    testing specific NIS client programs, or binding to a specific server when
    there are many servers on the local network supplying NIS maps.
The options are as follows:
  - -hhost
- Set the NIS binding on host instead of the local
      machine.
- -ddomain
- Use the NIS domain domain instead of the default
      domain as returned by
      domainname(1).