TCP/IP Configuration and Management Manual

SCF Reference
TCP/IP Configuration and Management Manual—427132-004
4-24
ADD SUBNET Command

The NonStop TCP/IP X.25 interface can open a maximum of 128 subdevices on a
specified X25AM device (line). The specified X25AM device must be active and the
subdevices must be added and in the STARTED summary state before you add an
X.25 SUBNET. Refer to the X25AM Configuration and Management Manual for
information on the methods for adding X.25 subdevices.

When you specify the name of the route or SUBNET you are adding, be sure to
specify the process name in the ASSUME command or in the ADD command, as
shown in the examples. Verify that the name is unique for that process.

Do not add more than one route to the same network. No matter how many
additional routes are added, only one route is used. Should that route become
disconnected or should errors occur, you must stop the faulty route and start a new
one.

The SLSA subsystem must be operational for the ADD command to complete
successfully. For more information, refer to the LAN Configuration and
Management Manual.

When a SUBNET is added, a corresponding route to this SUBNET is added
automatically. Both the SUBNET and the route are placed in the STOPPED state.
To initiate the operation of the object, you must start it with the START command.

When adding a SLSA SUBNET type, the DEVICENAME does not begin with a “$”
character. (X25 SUBNET types still require the “$” character.)

The logical interface (LAN device) which you specify in the SCF ADD SUBNET
command must be accessible from the TCP/IP processes’ primary processor
(CPU) and potentially accessible from the TCP/IP processes’ backup processor
(CPU). The LAN device also must be currently accessible from the same
processor as the TCP/IP processes’ primary CPU. If both conditions are not met,
the ADD of the SUBNET fails with the error: “Device access not available from
same CPU pair as TCPIP.”

SUBNETs on multiple TCP/IP processes in different or shared CPUs can share a
LIF but only one SUBNET can own the IP default filter (have GATEWAY ON). For a
TCP/IP process to be used as a router (in which case the process has multiple
SUBNETs on different LIFs), each SUBNET must be added with the GATEWAY
attribute enabled (ON).

Although SUBNETs on multiple TCP/IP processes in different or shared CPUs can
share a LIF, only one SUBNET from each process is allowed on the LIF.