TCP/IP Management Programming Manual

Introduction
HP NonStop TCP/IP Management Programming Manual—529636-001
1-5
Logical Interface
Logical Interface
The logical interface (LIF) is an object within the SLSA subsystem that provides an
interface between the data filters and the PIF of an E4SA or a TRSA.
Filters
Filters provide a logical mechanism whereby frames received from the LAN can be
sorted and delivered to a particular client such as NonStop TCP/IP. Filters replace the
Figure 1-1. Relationship of TCP/IP Subsystem to SLSA and X25AM Subsystems
Processor
File
System
Interface
TCP/IP Applications
Socket Library
TCP/IP
LANMON
LANMAN
SCF
LAN Drivers, Interrupt handlers (DIHs)
Y Fabric
X Fabric
LIF
filters
LAN
VST0101.vsd
QIO
Shared
Memory
Segment
E4SA
or
TRSA
SAC
PIF
LIF
PIF
LIF SAC
PIF
LIF
PIF
LIF SAC
PIF
LIF
PIF
LIF SAC
PIF
LIF
PIF
LIF