When trying to locate a DLU, an interchange node or migration data host can search the APPN network, the subarea network, or both. The order that VTAM® searches is based on the defined ADJSSCP tables, start option values, and the origin of the search request. Using the ADJSSCP tables and start options, you can concentrate the search on the part of the network containing the most frequently sought resources. See Adjacent SSCPs for information about using ADJSSCP tables.

For further information about searching an APPN network, see Network routing and resource location for APPN nodes.

For further information about searching a subarea network, review the appropriate sections of Implementing a subarea network, beginning with Start options defining other domains.