Administration Guide

Defining LU Types 0-3

You must configure dependent LUs of types 0-3 to support communication with a host system. You can use the information in this section to define an LU to support 3270, LUA, or back-level secondary LU0. You can also define a range of LUs, to configure multiple LUs of the same type in a single operation.

To configure an LU of types 0-3, use one of the following methods:

Motif administration program

Select one of the following from the Services menu on the Node window.

• 3270 and either New 3270 display LU or New 3270 printer LU
• LUA and New LUA LU
• TN server and New host LU

Command-line administration program

Issue one of the following commands:
define_lu_0_to_3

define_lu_0_to_3_range

define_secondary_lu0

You can use the advanced dialog to restrict access to a specific SSCP, to configure support for back-level applications using Generic SNA, CS/AIX V4R2-style LUs 1-3, or LU 0 secondary (for new applications, use regular type 0-3 LUs as configured on the basic dialog), or to specify an inactivity timeout.

LU Types 0-3 Configuration Parameters

The following parameters are required for LU types 0-3 configuration:

LU name

An LU name of 1-8 characters (for a single LU) or a base name of 1-5 characters (for a range of LUs, a prefix is added to the base name to form all of the names for the LUs that are defined).

The LU name is used only locally; it does not need to correspond to a name defined on the host.

Host LS/DLUR PU

The link station that provides the link to the host. The LU definition belongs to the link station you select. (If the dependent LU resides on a node that supports DLUR, this field identifies the DLUR PU that provides connectivity to the host.)

LU numbers

An LU number or range of LU numbers. LU numbers can be from 1-255.

The LU numbers must correspond to those in the host VTAM configuration. If you do not know what numbers are configured on the host, consult your SNA network planner.

LU type

One of the following LU types (depending on the type of LU you are configuring):

• For a 3270 display LU, specify the appropriate model based on the screen size:
  • 3270 model 2 (80x24)
  • 3270 model 3 (80x32)
  • 3270 model 4 (80x43)
  • 3270 model 5 (132x27)
• For a printer LU, specify one of the following:
  • 3270 printer
  • SCS printer
• If you do not know the LU type, if the LU is used to support SNA gateway from the local node to the host (an upstream LU), or if the LU is for an LUA application, specify Unrestricted (unknown for command-line configuration).

The LU type should match the configuration of the LU at the host. If the host is using DDDLU, the LU may not be configured at the host. In this case, the LU type you specify here is used to define the LU on the host dynamically. Otherwise, the LU type configured at the host takes precedence.

LU in pool

Whether the LU is assigned to an LU pool.

Pool name

The name of the LU pool.

Additional Configuration

After performing the LU type 0-3 configuration, continue with the following configuration tasks:

• To use a pool of dependent LUs for a 3270 display, for TN3270, or for LUA, define the LU pool as described in Defining LU Pools.
• For TN3270, define TN3270 client access records as described in Configuring TN Server.