OSI/AS Configuration and Management Manual

Installing and Configuring the Subsystem
OSI/AS Configuration and Management Manual—424119-001
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Configuring Large X.25 Applications
Configuring Large X.25 Applications
This subsection describes some options for configuring OSI/AS, OSI/TS, and X25AM
to support large applications. To control X25AM lines, there are two options:
•
One TSP process supports multiple X25AM lines; one or more TAPS processes may
use that TSP process.
•
A separate TSP process supports each X25AM line; one or more TAPS processes
may use each TSP process.
The advantages and limitations of each strategy are described in the following
subsections. For a more detailed description of how to configure the Transport Layer,
see the OSI/TS Configuration and Management Manual.
Characteristics of Large Applications
Large application typically have at least some of the following characteristics:
•
The application can be reached by one single address. In other words, the
application is addressed by a single TSEL, which in turn, is addressed by a single
DTE address (or by a single NSAP address).
•
The total number of connections to be supported by the application could possibly
exceed the current limits supported by X25AM (500 circuits in D-series systems) or
could possibly exceed the current limits supported by OSI/TS (512 connections in
most CPUs, or 1024 connections in Cyclone CPUs).
•
The application and the application environment allow the possibility of distributing
the load (in terms of the number of connections or the aggregate bandwidth) over
the underlying hardware and software components.
•
The application environment requires the hot-standby approach to provide fault
tolerance. (The hot-standby approach is one in which an identical system is ready to
take over if a system fails, but otherwise does no processing.)