TCP/IP Configuration and Management Manual

Configuring the NonStop TCP/IP Subsystem
TCP/IP Configuration and Management Manual—427132-004
3-16
Configuration 3: Startup Files for Two Hosts Using
an X25AM-Based Connection

Each host has an X25AM I/O process to control its SWAN concentrator.

Each I/O process to has six subdevices (SUs). A maximum of 128 SUs per line is
possible. The X25AM I/O process uses these SUs to provide multiple simultaneous
connections over the X.25 line. SCF will be used to configure and start these SUs.

Each host has its own NonStop TCP/IP process: $ZTC1 on \LA uses $X250;
$ZTC2 on \NY uses $X25A.

$ZTC1 has a SUBNET to represent its connection over $X250 to the X.25 network.
$ZTC2 has a SUBNET to represent its connection over $X25A to the X.25
network.

Each NonStop TCP/IP process automatically adds a ROUTE object when its
respective SUBNET is added.

Each NonStop TCP/IP process provides the platform upon which applications can
establish and use connections. These connections are established through the use
of ports (either well-known or application-specific). Applications make simultaneous
use of these ports by using the sockets interface.
To configure each host with its connection to an X.25 network, do the following:
1. Configure the X.25 line with a compatible set of attributes.
2. Configure the X.25 line with a set of SUs. Each SU must have an appropriate set
of attributes.
3. Start the X.25 line.
4. Start a NonStop TCP/IP process, and configure it with a SUBNET object and
appropriate ROUTE objects.
These tasks and their details are new, but the basic configuration tasks are the same
as those for a LAN-based environment:

Configure the I/O process and its line(s). For X25AM, you configure line attributes
and SUs.

Start a NonStop TCP/IP process and configure SUBNET objects and ROUTE
objects. For X.25-based SUBNETs, you specify a SUBNET type of X.25.

Start a LISTNER process for each NonStop TCP/IP process.
Now, examine the set of command files that will configure the X.25 network. The first
set of command files configures \LA; the second set configures \NY.
Note. Other SUBNET types exist to support subsystems other than X25AM. For example,
LAN-based SUBNET objects require a SUBNET type of ETHERNET or SNAP. ATM-based
SUBNET objects require a SUBNET type of ATM.