To use dependent LU server support across subnetwork boundaries, APPN multiple network connectivity support is required. NCP Version 7 Release 1 is also required for DLUS support across subnetwork boundaries.

If a DLUS is located in a different APPN subnetwork than a DLUR, the subnetwork of the DLUS must enable APPN multiple network connectivity support, as shown in Figure 1.

Also shown in Figure 1, if a DLUS is located in a different APPN subnetwork than the primary LU, both the subnetwork of the DLUS and the subnetwork of the primary LU must enable APPN multiple network connectivity support.

Figure 1. DLUS located in different APPN subnetwork than DLUR or PLU

If a primary LU exists in or through a subarea network, as shown in Figure 2, all other APPN subnetworks through which the primary LU might be reached that use interchange nodes for connectivity to or through the subarea network must enable APPN multiple network connectivity support.

Figure 2. PLU exists in or through a subarea network

For further information about APPN multiple network connectivity support, see APPN multiple network connectivity.