SNA NRJE Node Managers Guide (30292-90007)

Chapter 4 55

NA NRJE Workstation Startup and Shutdown

Starting a Workstation

Once you have created the corresponding stream job ﬁles, you can start

up the workstations. To use an SNA NRJE workstation, you must

initiate an LU-LU session between an HP 3000 LU (the secondary LU)

and a host LU (the primary LU). An NRJE LU-LU session is initiated

by the LU in the HP 3000 node, with the MPE command NRJECONTROL

START or the NRJE command STARTWS (see Chapter 6 , “Commands,” of

this manual). The issued command causes an INITiate-SELF

(INIT-SELF) request to be sent to the SSCP.

In processing the INIT-SELF request, the SSCP determines if the host

LU is accepting session-initiation requests. The SSCP then sends a

Control INITiate (CINIT) request to the host LU. The host LU then

sends a BIND request to the HP 3000 LU. The BIND protocols speciﬁed

in the request must be accepted by the HP 3000. If the protocols are

acceptable, the HP 3000 LU sends a positive response, and the LU-LU

session is established. The host LU sends a SESSion STarted (SESSST)

request to notify the SSCP that the session has been established. The

host LU sends a Start Data Trafﬁc (SDT) request to the HP 3000 LU, to

allow data requests to be transmitted. Figure 4-1 shows how an NRJE

LU-LU session is initiated.