Sun Microsystems SunLink SNA 9.1 PU2.1, Руководство по настройке

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C-6 SunLink SNA 9.1 PU2.1 Server Configuration Guide—August 1997
C
The Sun PU2.1 SNA Server maintains SSCP-PU sessions and SSCP-LU
sessions. The Sun SNA clients establish LU-LU sessions.
The following is an example of a hierarchical SNA session:
•
You enter a log-in request on your terminal for TSO.
•
SSCP receives your request on an SSCP-LU session.
•
SSCP notifies TSO of your request by using the SSCP-LU session between
SSCP and TSO.
•
TSO sends a bind request to your LU. The bind request specifies the session
parameters. TSO is the primary LU (PLU). Your terminal is the secondary
LU (SLU).
•
Your terminal accepts the bind to establish an LU-LU session.
C.2 Peer-to-Peer SNA
The following sections describe distributed, peer-to-peer networks.
C.2.1 Physical Components
A peer-to-peer SNA network consists of autonomous nodes linked together
over an SNA transport network. The transport network contains the lower
layers of the SNA protocol stack: Path Control (PC), Data Link Control (DLC),
and the actual physical communications medium. The physical medium can be
telecommunications lines, such as SDLC and X.25, or local area networks, such
Table C-2 SBA Sessions
Type Connected Nodes Function
SSCP-SSCP SNA hosts Coordinates cross-network
session establishment.
SSCP-PU SNA host and node Manages SNA resources
associated with node.
SSCP-LU SNA host and
application Manages sessions established by
application.
LU-LU Application and
application Exchanges data between end
users.