Expand Configuration and Management Manual (G06.24+)

Planning a Network Design
Expand Configuration and Management Manual—523347-008
3-5
Asynchronous Transfer Mode (ATM) Networks
select a TCPSAM or TCP6SAM process with which to associate your Expand process,
those processes provide access to all the configured TCP/IP SUBNET objects and
their IP addresses.
NonStop TCP/IPv6, however, introduces a feature called logical network partitioning
(LNP), that, when enabled, restricts to which SUBNET objects and IP addresses the
TCP6SAM process has access, much like the conventional NonStop TCP/IP process.
When you are planning your Expand-over-IP environment, you may use LNP to control
over which network interfaces (IP addresses) the Expand line-handler processes run.
See Step 1 (C): Select a Process and SUBNET for NonStop TCP/IPv6 Use on
page 8-13 for examples of working with logical network partitioning.
To determine which TCP/IP subsystem is running on your system, use the SCF
LISTDEV TCPIP command. The text after the last period (.) in the Program field on the
far right of the display is either TCPIP, which identifies the process as a conventional
NonStop TCP/IP process, TCPSAM, which identifies the process as a Parallel Library
TCP/IP process, or TCP6SAM, which identifies the process as a NonStop TCP/IPv6
process. NonStop TCP/IP can coexist on the system with either Parallel Library TCP/IP
or NonStop TCP/IPv6 but Parallel Library TCP/IP and NonStop TCP/IPv6 cannot
coexist with each other.
For more information about LNP and about NonStop TCP/IPv6, see the TCP/IPv6
Configuration and Management Manual and the TCP/IPv6 Migration Manual. For more
information about NonStop TCP/IP, see the TCP/IP Configuration and Management
Manual. For more information about Parallel Library TCP/IP, see the TCP/IP (Parallel
Library) Configuration and Management Manual.
Asynchronous Transfer Mode (ATM) Networks
Asynchronous Transfer Mode (ATM) technology is based on the efforts of the
International Telecommunication Union Telecommunication Standardization Sector
(ITU-T) Study Group XVIII to develop Broadband Integrated Services Digital Network
(BISDN) for the high-speed transfer of voice, video, and data through public networks.
ATM is a cell-switching and multiplexing technology that combines the benefits of
circuit switching (constant transmission delay and guaranteed capacity) with those of
packet switching (flexibility and intermittent traffic). ATM is a connection-oriented
environment.
The Expand-over-ATM line-handler process uses the HP ATM subsystem to implement
Expand-over-ATM connectivity. The Expand-over-ATM line-handler process
communicates with the ATM subsystem through the shared memory of the QIO
subsystem.
Note. The ITU-T carries out the functions of the former Consultative Committee for
International Telegraph and Telephone (CCITT).