In Figure 1, some resources are attached to the end node by nonnative network type 2.1 connections. If one of the resources initiates a session, the network node server caches the network-qualified name of the originating LU, and the resource can be found subsequently by the APPN network. However, APPN might not be able to locate these resources when attempting to locate them as destination LUs, unless the resources are predefined at the end node (with CDRSC definitions for all possible network IDs) and registered with the network node server. If all possible network-qualified names of the resource are known at the network node server, APPN searches can locate the destination LU. The use of a predefined alias name for these resources at the end node is not recommended.

Figure 1. Nonnative network type 2.1 connections