HP HP-UX SNAplus2, Руководство администратора, Страница: 35 / 398

Chapter 1 35
SNA Terms and Concepts
Basic SNA Concepts
Operating System) use LU 0. Current releases of these
products also support LU 6.2 communication, which is
the preferred protocol for new applications.
NOTE For information about the data streams used by SNA logical units, refer
to Systems Network Architecture Technical Reference.
Control Points
A control point (CP) is an NAU that manages network resources within
its domain, controlling resource activation, deactivation, and status
monitoring. The CP manages both physical resources such as links, and
logical information such as network addresses.
SNA defines the following types of network control points:
System services control point
On a type 5 node, the CP is called a system services
control point (SSCP). It manages and controls the
network resources in a subarea network. For example,
an SSCP can use a directory of network resources to
locate a specific LU under its control, and can establish
communication between two LUs in its domain. An
SSCP can also cooperate with other SSCPs to establish
connectivity between LUs in different subarea
domains.
The SSCP also provides an interface to network
operators at the host system, who can inspect and
control resources in the network.
Physical unit control point
On type 4 nodes and type 2.0 nodes in a subarea
network, the control point is called a physical unit
control point (PUCP).
Control point
On type 2.1 nodes, the control point provides both PU
and LU functions, such as activating local link stations,
interacting with a local operator, and managing local
resources. It can also provide network services, such as
partner LU location and route selection for local LUs.