Path definition statements

Path definition statements are used for two different purposes:

To define VTAM® paths
PATH definition statements represent the routes VTAM takes to communicate with other subarea nodes. One or more PATH definition statements are filed in the VTAM definition library. The name assigned to a path definition set is used to activate that set of paths. More than one path definition set can be filed and activated.

Information on coding the definition statements that define VTAM paths is in VTAM routes.
For dynamic path update
Dynamic path update allows the VTAM operator to add NCP path definitions or VTAM path definitions dynamically without regenerating and reloading the NCP. If the explicit route (ER) is not currently operative, NCP path definitions can also be replaced dynamically without regenerating and reloading the NCP. Also, a delete function for inoperative ERs is provided for both VTAM and NCP path definitions. You can also use dynamic path update to change path definition parameters such as virtual route (VR) pacing window size for inoperative routes.
- For VTAM:
  The dynamic path specification set for VTAM contains VPATH and PATH definition statements.
  
  The VPATH definition statement identifies the VTAM subarea and the network to which the path update specification set applies in a dynamic path update member. The PATH definition statement defines the explicit routes, virtual routes, and virtual route pacing window size for the path.
  
  Information on coding the definition statements that define VTAM dynamic path update is in Dynamic path update (VTAM).
- For NCP:
  The dynamic path specification set for an NCP contains NCPPATH and PATH definition statements.
  
  The NCPPATH definition statement identifies the NCP and the network to which the path update specification set applies in a dynamic path update member. The PATH definition statement defines the explicit routes, virtual routes, and virtual route pacing window size for the path.
  
  Information on coding the definition statements that define NCP dynamic path update is in Dynamic path update (NCP).