Remote and local logical units

The Rumba APPC Configuration tool simplifies the task of managing remote and local logical unit (LUs)s. A local LU represents the local workstation, while the a LU represents the local workstation conversation partner.

LU properties

Because the concept of the LU has evolved, it is easier to understand the LU by looking at its properties:

  • Sessions have LUs at each end.
  • To establish a session, a client must have the server’s LU name, which is known as the remote LU.
  • In a hierarchical network, an LU has a defined global address that it uses to route data.
  • You can assign different LU names to a host’s different subsystems.
Note: An LU name does not signify a machine or program name, it designates the role a machine or program has within a network. For example, an LU name can designate a network server.

Logical unit configuration tips

Here are a few tips to consider when you use the Rumba APPC Configuration tool to add or change logical units:

  • For a computer client, the LU name default can be the computer name. The Rumba APPC Configuration tool does this automatically in the configuration process.
  • For a server, consider using an LU name alias based on the function, rather than the computer name. This minimizes disruption if the function is moved to another computer.
  • When you are connected to a subarea SNA network, finding an LU name is problematic because you do not have network node services. In this case, you must configure a remote LU and associate it with a route.