Dependent LU requester support

Dependent LU Requester Support (DLUR) allows dependent secondary logical units (LU 0, 1, 2, and 3) an entry point into the APPN network. DLUR support gives the appearance of having an adjacent connection to VTAM®, but allows traversing the APPN network through intermediate nodes.

DLUR supports the following controllers, displays, and printers:

• Host devices, including 3270 emulation (*EML), remote job entry (*RJE), and program-to-program communications (*PGM)
• SNA Passthrough upstream devices
• DHCF display devices
• NRF display and printer devices
• SNUF devices (DSNX)

The normal SSCP-PU and SSCP-LU flows for dependent LUs are encapsulated in a control point server (CP-SVR) pipe. This pipe consists of two LU 6.2 sessions:

• Send
• Receive

At the primary end of the pipe is a Dependent LU Server (DLUS). At the secondary end of the pipe is a Dependent LU Requester (DLUR). DLUS and DLUR support the activation and deactivation of dependent physical units (PUs) and logical units (LUs) in the APPN network. The pipe consists of a pair of LU 6.2 conversations where two APPC applications (DLUR and DLUS) exchange dependent SNA SSCP flows. The flows are encapsulated in a general data stream (GDS) variable and sent in LU 6.2 logical records. The pair of conversations that are used to transmit encapsulated SNA is called the CP-SVR Pipe.

To configure DLUR, see the article Configure Dependent LU Requester.