When you use SNA network interconnection, you might also have to redefine existing major node definitions.
VTAM uses tables for routing, to begin and end sessions, and to define messages and certain operator commands and to suppress messages. You can create, replace, or modify these tables while VTAM is running.
VTAM also provides a filter for session awareness (SAW) data that is passed to communication network management (CNM) application programs, such as NetView®. You can create, modify or replace the filter while VTAM is running.
After you define a network, you can use dynamic reconfiguration to add, move, or delete resources attached to an NCP or to add or delete locally attached logical units. In addition, you can dynamically change the values of certain operands.
See z/OS Communications Server: SNA Network Implementation Guide for information about the methods of dynamic reconfiguration.