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Configuring APPN Services

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308963-14.00 Rev 00

Dependent Logical Unit Requester and Server

APPN’s Dependent Logical Unit Requester (DLUR) supports LU type 0, 1, 2, 3

and LU6.2 dependent logical units within APPN. In contrast to the base APPN

architecture, which uses independent LUs for LU-to-LU sessions, dependent LUs

need a mainframe-based system services control point (SSCP) to establish and

manage LU-to-LU sessions. DLUR allows these dependent LUs to use APPN

networks by encapsulating the SSCP control flows within the APPN LU 6.2

sessions. The APPN network routes the dependent LU-LU data flows.

DLUR works with the dependent LU server (DLUS) component of the virtual

telecommunications access method (VTAM) to provide a path for SSCP flows

between VTAM and dependent LUs across an arbitrary APPN backbone network.

The DLUR node serves as a point of connection for PU2.0 devices (such as

3270-type devices) to attach to an APPN backbone.

The DLUR and DLUS components in an APPN network allow the SSCP and the

PU2.0 device to exchange control flows across the APPN backbone. DLUR and

DLUS form a tunnel (called a CP-SVR pipe) that allows the SSCP at the DLUS

side of the pipe to send SNA control flows to the PU2.0 device at the DLUR side

of the pipe. The CP-SVR pipe is a pair of LU6.2 sessions that encapsulate the

SSCP control flows.

Figure 1-3

illustrates the DLUR and DLUS components in APPN.

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