PATH definition statements are representations of 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. Note that the VBUILD definition statement is not used.
Communication with other subarea nodes is not possible unless all the required path tables are active. Therefore, you should activate any required path tables before you activate any NCP or channel-attachment major nodes.
Note that, unlike NCP, VTAM requires you to code a reverse virtual route in the VTAM that receives an activate virtual route command because VTAM cannot dynamically allocate a virtual route when it receives the command.