HP CommonIO Products Manual de usuario Pagina 19
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About the X.25 Product
Transport Level (L4)
Chapter 1 19
Transport Level (L4)
At the transport level (level 4), the X.25 link provides TCP (based on the
DARPA standard) and UDP. These Transport level protocols are used by
Internet/Berkeley Services, by NS, and by user application programs
that access the TCP/UDP and IP protocols.
The TCP protocol is a connection-based protocol. TCP verifies that all
data is delivered without duplication to its destination. The UDP
protocol, unlike TCP, has no concept of a connection. Messages are sent
as a unit with source and destination information in the header.
The X.25 link provides a BSD to PLP (Packet Level Protocol) translator
to allow access to PLP at level 3 for user-written application programs
via BSD IPC.
The X.25 link also provides an OTS to PLP translator to allow access to
PLP at level 3 for OSI Services via Xport OSI.
- HP X.25/9000 User’s Guide 1
- Legal Notices 2
- Contents 3
- 1 About the X.25 Product 15
- About the X.25 Product 17
- Chapter 1 17 17
- Session (L5) Levels 18
- Transport Level (L4) 19
- Packet/network Level (L3) 20
- Chapter 122 22
- 2 Installation 23
- Hardware Requirements 24
- Software Requirements 27
- 3 Configuration 29
- Configuring the X.25 Link 30
- Configuring an X.25 Address 32
- Verifying Level 3 Values 39
- Verifying Level 2 Values 44
- Configuring X.25 over LLC2 54
- Configuration 58
- Chapter 358 58
- XOL_logical_port_id 1 66
- XOL_DSAP 0x70 66
- XOL_SSAP 0x70 66
- Configuring PAD Services 71
- Add/Modify UUCP Server 73
- Add/Modify X.3 Parameters 74
- Packages 77
- X.25 Cluster Definition 77
- X.25 over LLC2 81
- Local Failover 82
- Step 1. T 85
- Remote Failover 86
- longer required 89
- Service Guard 91
- Step 2. Con 93
- Chapter 394 94
- Chapter 3 95 95
- Verifying the X.25 Link 96
- 4 OLA/R Overview and Concepts 97
- Important Terms and Concepts 99
- Planning and Preparation 100
- Critical Resources 101
- Card using SMH 103
- OLA/R Overview and Concepts 110
- Chapter 4110 110
- 5 Diagnostic Utilities 111
- Using Diagnostic Utilities 112
- Break key as your interrupt 114
- Parameters) 115
- Diagnostic Utilities 116
- Chapter 5116 116
- Counters 123
- Chapter 5 125 125
- PER-VC STATISTICS FOR X25 126
- 126
- 6 PAD Services 129
- Introduction 130
- Packet Switching 131
- Overview 132
- User Level 133
- BSD Sockets 133
- 0x01000000 134
- System Requirements 140
- Examples 144
- UUCP Support (x29uucpd) 146
- Configuring UUCP PAD Support 147
- Local PAD Emulation (padem) 156
- Data Transfer Mode 157
- PAD Commands 160
- Extended Command Set 161
- Configuration Set Syntax 163
- Modifying Parameters 164
- X.3 Parameter Descriptions 165
- Ctrl-P, 32 to 126 permits 166
- Chapter 7 175 175
- Tracing and Logging Utilities 177
- Chapter 7 177 177
- Creating a Filter File 183
- Device File 188
- Sub code = 188
- Examples of strace Output 193
- Chapter 7196 196
- 8 Troubleshooting 197
- Run x25stat 200
- Statistics dispayed 200
- Troubleshooting 202
- Chapter 8202 202
- Reporting Problems 209
- Eliminator 211
- Commands 212
- Examples of x25init 214
- File Mapping Parameters 216
- Appendix A 219 219
- Appendix A224 224
- X.25 Configuration Files 226
- Example Files 228
- Appendix B 229 229
- Table B-6 (Continued) 229
- Appendix B230 230
- The x25init_smpl File 231
- Appendix B232 232
- Table B-7 (Continued) 232
- The x3config File 233
- Appendix B234 234
- Appendix B 235 235
- The x29hosts File 236
- C Diagnostic Messages 239
- Diagnostic Message Example 241
- Cause Code Settings 242
- Packet Codes 243
- X.25 Diagnostic Messages 244
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