Expand Configuration and Management Manual (H06.03+)

Contents
Expand Configuration and Management Manual—529522-002
xv
17. Subsystem Description (continued)
17. Subsystem Description (continued)
Expand Subsystem and the OSI Reference Model 17-8
Expand Line-Handler Process Layer Functions 17-9
$NCP Layer Functions 17-11
Path Function of the Expand Subsystem 17-12
Protocol Packet Types 17-12
Packet Synchronization 17-15
Example of End-to-End Protocol Packet Exchanges 17-15
Layer 4 Send Window 17-20
Routing and Time Factors 17-21
Setting Time Factors 17-22
Negotiating Path Time Factors 17-23
Best-Path Route Selection 17-23
Network Routing Table (NRT) and Multiple Path Table (MPT) 17-24
Calculating Route Time Factors 17-26
Routing Algorithms 17-27
Multi-CPU Paths 17-30
Multi-CPU Routing Examples 17-33
Message Handling and Buffer Allocation 17-37
Outgoing Traffic Flow 17-37
Incoming Traffic Flow 17-41
Message Buffering 17-45
Global Variables 17-46
Stack 17-46
Control Blocks 17-46
Line Buffer 17-46
Buffer Pool 17-46
Shared Memory Area for QIO 17-47
Expand-to-NAM Interface 17-48
Network Access Method (NAM) Processes 17-48
Connection Establishment 17-49
Sending and Receiving Data 17-51
Expand-to-IP Interface 17-52
NonStop TCP/IP Processes 17-52
Expand-over-IP Connection Establishment 17-53
Sending and Receiving Data 17-55
Forwarding Expand-over-IP Packets to Other Expand Line-Handler
Processes 17-56