Defining logical unit type 6.1 links

Important

You are advised to use MRO or APPC links for CICS®-to-CICS communication.

LUTYPE6.1 links are necessary for intersystem communication between CICS and any system, such as IMS™, that supports LUTYPE6.1 protocols but does not fully support APPC.

You must not have an LUTYPE6.1 and an APPC connection installed at the same time between an LU-LU pair.

A DEFINE CONNECTION is always required to define the remote system on an LUTYPE6.1 link. The sessions, however, can be defined in either of the following ways:

  1. By using a single DEFINE SESSIONS command to define a pool of sessions with identical characteristics.
  2. By using a separate DEFINE SESSIONS command to define each individual session. This method must be used to define sessions with systems, such as IMS, that require individual sessions to be explicitly named.

Related concepts
Introduction to link definition
Related tasks
Identifying remote systems
Defining links for multiregion operation
Defining links for use by the external CICS interface
Defining APPC links
Defining CICS-to-IMS LUTYPE6.1 links
Defining indirect links for transaction routing
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