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38 Chapter 1
SNA Terms and Concepts
Basic SNA Concepts
dependent LU requester (DLUR) function enables session traffic from
dependent LUs to flow over APPN networks. For more information
about DLUR, see “Accessing Subarea Networks from APPN
Networks”.
A dependent LU on a peripheral node is always the secondary LU.
• An independent LU can establish sessions with other independent
LUs without the aid of an SNA host. LU 6.2 is the only LU type that
can be independent.
An independent LU can act as a primary or as a secondary LU when
establishing a session.
Multiple and Parallel Sessions
An independent LU can participate in sessions with more than one
remote LU at the same time (multiple sessions).
An independent LU can also participate in parallel sessions, or multiple
concurrent sessions with the same remote LU.
Dependent LUs (including dependent LU 6.2) cannot have multiple
sessions.
LUs with multiple and parallel sessions are shown in Figure 1-2,
“Multiple and Parallel Sessions.” LUA and LUB have parallel sessions.
LUA also has multiple sessions: two with LUB and one with LUD. LUD
has multiple sessions with LUA and LUC.