LU-LU session flows

Figure 1 through Figure 1 show the network flows to establish LU-LU sessions.

The figure captions for some of the figures indicate the configuration that the flow applies to and the type of session shown. For example, the caption EN (PLU)—NNS…APPN Network; PLU-Initiated, with No Queueing means A primary logical unit (PLU) on an end node (EN) that is attached to an APPN network through a network node server (NNS). The symbol — indicates a CP-CP session. The symbol == indicates a CDRM-CDRM session. The symbol … means that part of the network is not shown.

All of these flows assume that the directory services database has accurate information about the location of the destination LU.

The following terms are used in these figures:

Term: Meaning
Endpoint TGVs: A list of control vector pairs: CV X'46' and X'47'
RSCV: Route selection control vector, CV X'2B'
Scout search: Sent to find out the location of the destination LU (DLU) and to precompute the session RSCV, if either the origin LU (OLU) or the DLU is in a subarea network. Because it is necessary only to find the DLU and not to set up the session, it is not necessary to actually verify the location of the DLU or to reserve resources for the session.