TCP/IP Configuration and Management Manual

TCP/IP Configuration and Management Manual—427132-004
4-1
4 SCF Reference
This section provides information about:

The Subsystem Control Facility (SCF)

SCF commands available for TCP/IP (to find a command quickly, see Table 4-5 on
page 4-9.)

The PTrace facility
SCF for NonStop TCP/IP
SCF provides an operator interface to an intermediate process, the Subsystem Control
Point (SCP), which in turn provides the interface to the I/O processes of the various
subsystems.
The QIO subsystem improves the I/O performance of LAN clients by providing a
shared data segment and associated functions to manage the various resources. The
QIO Manager handles all SPI requests to the subsystem.
The NonStop TCP/IP subsystem runs as a NonStop process pair on the NonStop
operating system and supports subnets using Ethernet or token ring LANs and ATM or
X25 networks.

The Ethernet and SNAP SUBNETs use the SLSA subsystem to provide access to
Ethernet local area networks.

The ATM SUBNET uses the ATM subsystem to access the ATM network.

The NonStop TCP/IP subsystem is a client of the SLSA subsystem.

The X.25 SUBNET uses the X.25 Access Method (X25AM) subsystem for access
to the Defense Data Network (DDN), X.25-based public data networks (PDNs), and
other X.25-based networks. This X.25 interface is used to create virtual circuits to
remote hosts, so that IP datagrams can be sent over the virtual circuits.
Object Types
You can monitor and control the NonStop TCP/IP subsystem by issuing commands
that act on one or more NonStop TCP/IP subsystem objects. Each object has an object
type and an object name. The object type describes the type of object. The object
name uniquely identifies the object within the system.
There are seven NonStop TCP/IP subsystem object types:

ADDRMAP

ENTRY

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