Filing definition statements

Code the appropriate VTAM® or NCP definition statements to define the major nodes. You can also file the definitions in the VTAM definition library or to update your definitions after filing them in the VTAM definition library.

To define major nodes and file the definitions in the VTAM definition library or to update your definitions after filing them in the VTAM definition library, do the following steps:

1. Code the appropriate VTAM or NCP definition statements to define the major node. If you are defining an NCP, code the NCP-only definition statements and operands as described in the NCP resource definition documents.

   You must use domain-unique names in all VTAM-related definitions that are active at the same time. For example, the name on a definition statement defining a minor node must not be the major node name. A definition is active when VTAM reads the major node in which it is contained. VTAM reads a major node when it is referenced in the configuration list or when it is activated by a VARY ACT command.

2. Generate the NCP as described in the NCP, SSP, and EP Generation and Loading Guide. If you are updating VTAM-only definition statements or operands, update the NCP definitions in the VTAM file; no NCP generation is required. If you are updating NCP-only definition statements or operands, you can use dynamic reconfiguration to update the statements without regenerating the NCP. See Dynamic reconfiguration and dynamic change for more information.
3. Store the network definition in the proper VTAM library. You can link SYS1.VTAMLST files, but one of the following conditions must be met:
   • The block size must be the same for all files.
   • The file with the largest block size must be the first file in the link.
   • DCB=BLKSIZE=[largest_blocksize_of_ concatenated_files] must be coded on the first file in the link.

   You must run an operating system utility program to put the definitions into the definition library.