SPI Common Extensions Manual

SPI Common Extensions Manual—427508-001
2-1
2 Extended SPI Concepts
The extended SPI interface is based on these concepts:
Objects
An object is any logical or physical entity defined and controlled by a subsystem. The
subsystem itself can be viewed as an object. For example, a line to an X.25 network is
an object controlled by a running instance of the X25AM subsystem.
Most SPI messages are concerned with a specific object or set of objects:
•
Management applications send commands to subsystems to control objects.
•
Management applications send queries to subsystems to obtain information about
objects.
•
Subsystems generate events to signal changes in the status of objects.
All objects have these features, which combine to uniquely identify them:
•
A name
•
A type
•
A method of creation
•
A set of configuration attributes
Some objects have these additional features:
•
Connections to other objects (links)
•
A reported summary state
•
A status
•
A set of statistics
Topic Page
Objects
2-1
Object Types 2-2
Object Names 2-4
Commands 2-7
Command Modifiers 2-8
Summary States 2-10
Subsystem Identification 2-11
Requester Identification 2-13