Dynamic path update enables the VTAM® operator to add or replace NCP path definitions without regenerating and reloading the NCP if the explicit route (ER) is not currently operative. In addition, a delete function for inoperative ERs is provided for both VTAM and NCP path definitions. Dynamic path update can also be used to change path definition operands, such as VR pacing window size, for inoperative routes.
VTAM distinguishes path definition sets from dynamic path update members based on the first noncomment statement in the member. If the first noncomment statement is a PATH definition statement, it is considered a path definition set. If the first noncomment statement is a VPATH or NCPPATH definition statement, it is considered a dynamic path update member.
See z/OS Communications Server: SNA Network Implementation Guide for examples of dynamic path update and for a discussion of restrictions that apply to path definition sets and dynamic path update members.