Resource registration: EN to NN to CDS

Figure 1. Resource registration: EN to NN to CDS

Note: In this figure, the end node registers its resources to NN1:

NN1 owns the following resources:

NN1 registers the following resources to the central directory server (CDS):

The VTAM® operator in the end node activates a major node containing LUA, LUB, and LUC. The end node sends a registration request to NN1.
NN1 adds entries to the directory database and then sends a registration reply to EN1.
NN1 sends a central registration request to CDS1. The registration request travels with a LOCATE GDS variable because the central directory server can be several nodes away.
CDS1 returns a reply to NN1.
The VTAM operator activates a major node containing applications X, Y, and Z. The subarea SSCP notifies the APPN control point (CP) of resources owned by NN1 that should be centrally registered. (CRR stands for central resource registration.)
APPN CP sends an immediate reply to the subarea SSCP.
NN1 sends a central registration request to CDS1.
CDS1 returns a reply to NN1.
The end node sends a DELETE request to NN1.
NN1 removes LUB from its directory database and returns a reply to the end node. NN1 does not forward the DELETE request to the central directory server.