Expand Configuration and Management Manual (G06.24+)

Configuring Expand-Over-IP Lines
Expand Configuration and Management Manual—523347-008
8-5
Local Area Network (LAN) Driver and Interrupt
Handlers (DIHs)
to that destination. Unless network redundancy is provided implicitly in the destination
addresses, the same adapter/line may be used for all connections to the same
neighbor. Both Parallel Library TCP/IP and NonStop TCP/IPv6 (in either LNP or non-
LNP mode) can be configured with a redundancy feature at the adapter level called
Ethernet failover. This feature allows you to configure two network interfaces (IP
addresses and their associated physical interfaces on the Ethernet adapter) as a
failover pair. Each network interface in this failover pair provides full, independent
network connectivity in normal conditions and provides backup connectivity for its
brother during a failure. If one member of the failover pair fails, the Parallel Library
TCP/IP or NonStop TCP/IPv6 subsystem automatically routes network traffic destined
for the failed interface over its failover brother.
For information about configuring Ethernet failover in Parallel Library TCP/IP, see the
TCP/IP (Parallel Library) Configuration and Management Manual. For information
about configuring Ethernet failover in NonStop TCP/IPv6, see the TCP/IPv6
Configuration and Management Manual.
Local Area Network (LAN) Driver and Interrupt Handlers (DIHs)
NonStop TCP/IP processes can interface to an IP network through the ServerNet LAN
Systems Access (SLSA) subsystem. The SLSA subsystem provides QIO-based driver
and interrupt handlers (DIHs) that allow NonStop TCP/IP processes to connect to a
LAN adapter. The SLSA subsystem is preconfigured and is started during the system-
load sequence.
For information about the SLSA subsystem, refer to the LAN Configuration and
Management Manual.
Asynchronous Transfer Mode (ATM) Subsystem
NonStop TCP/IP processes may also interface to an IP network through the
Asynchronous Transfer Mode (ATM) subsystem. The ATM subsystem provides
software that allows NonStop TCP/IP processes to connect to an ATM ServerNet
adapter (ATM3SA). You must install the ATM3SA and configure and start the ATM
subsystem before you can start an Expand-over-IP line-handler process that uses this
connection method.
For information about the ATM subsystem, refer to the ATM Configuration and
Management Manual.
E4SA, FESA, GESA, G4SA and ATM3SA
You can use either an E4SA, FESA, GESA, G4SA, or an ATM3SA to provide
connectivity to an IP network.
The E4SA is a double-high ServerNet adapter that supports four Ethernet interfaces
and communicates with multiple processors through its dual ServerNet interfaces to
the ServerNet fabrics. Two E4SAs are used to connect a SWAN concentrator to a
processor.