gtpi1m4t | System Installation Support Reference |
The route selection user exit, CSJV is activated by the CDCINIT request PIU processor (CSJC). This exit selects a virtual route (VR) for an LU-LU session when the TPF system issues the BIND request PIU. The SNA communication route selection exit is necessary because 2 VRs can be active between 2 adjacent subareas. TPF supports VR 0 and VR 1 across channel-to-channel (CTC) links.
Route selection is specified by updating the CCW area index in field RV1CCWIN of the secondary LU's (SLU) resource vector table, part 1 entry. RV1CCWIN equals 0 for VR 0, and 1 for VR 1. CSJV contains sample logic that alternates between VR 0 and VR 1 for session assignment.
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