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X.25 Overview
117377-A Rev. A 1-7
PVCs and SVCs
Bay Networks X.25 services enable you to configure both permanent virtual
circuits (PVCs) and switched virtual circuits (SVCs).
A PVC is a permanent logical path that you configure between two DTEs. It uses
a fixed logical channel to maintain a fixed point-to-point connection between two
end stations on a network. A PVC requires no setup operation before or
disconnect operation after data travels between these end stations.
An SVC is a connection across a network that exists only as long as data travels
across that circuit. An SVC is established on an as-needed basis, and can connect
any two end stations in the network. SVCs have three separate phases: call setup,
data transfer and call disconnection.
You can configure a combination of PVCs and SVCs on the same interface.
For instructions on configuring X.25 PVCs and SVCs, refer to Cha
pter 3,
“Enabling X.25 Service.”
How X.25 Services Work
End users on a LAN use the services of the Bay Networks router to access X.25
networks. The router acts as a DTE device; it encapsulates user data in X.25
format and transmits it across the network.
PVC Services
PVCs work the same way as SVCs, except that you configure permanent
mappings for PVCs, while SVCs create mappings each time a call occurs.
You create permanent mappings by assigning the appropriate PVC LCN in the
adjacent host record for the specified protocol. The PVC LCN value can not be
numerically equal to any SVC remote X.121 address that is configured in an
adjacent host record for the same protocol and on the same next-hop interface.
Configuring X.25 PVCs for IP, IPX, and DECnet
Enter a PVC LCN value in the Adjacent Host Address parameter.
- Configuring X.25 1
- Services 1
- Contents 5
- 117377-A Rev. A 11
- About This Guide 15
- Before You Begin 16
- Conventions 16
- Acronyms 17
- Bay Networks Customer Service 19
- How to Get Help 20
- Chapter 1 21
- X.25 Overview 21
- X.25 and the OSI Model 22
- Physical Layer 23
- Data Link Layer 23
- Figure 1-3. LAPB Frame 24
- X.25 Service Types 25
- 1-6 117377-A Rev. A 26
- PVCs and SVCs 27
- How X.25 Services Work 27
- SVC Services 28
- 117377-A Rev. A 1-9 29
- How IPEX Works 33
- IPEX Network Interfaces 34
- X.25 PLP Interface 35
- TCP Interface 35
- IPEX Facility Support 36
- IPEX Connection Summary 38
- IPEX Mapping 38
- Q-bit Support 40
- How QLLC Works 41
- QLLC Mapping 42
- Adjacent and Partner Devices 42
- Chapter 2 45
- Implementation Notes 45
- Load Sharing 46
- Max Packet Length 47
- Flow-Control Negotiation 47
- Configuring Line Services 48
- DDN Default Service Record 49
- RFC 1356 Multiplexing 50
- 117377-A Rev. A 2-7 51
- PtoP Encapsulation 52
- X.25 over ISDN D Channel 52
- Further Information 53
- Chapter 3 55
- Enabling X.25 Service 55
- Selecting a Connector 56
- Config window (F 57
- Configuration window (F 58
- 60
- 3-8 117377-A Rev. A 62
- 3-10 117377-A Rev. A 64
- 3-12 117377-A Rev. A 66
- 67
- 3-14 117377-A Rev. A 68
- 3-16 117377-A Rev. A 70
- Chapter 4 73
- 4-2 117377-A Rev. A 74
- 80
- 4-10 117377-A Rev. A 82
- 4-12 117377-A Rev. A 84
- 4-14 117377-A Rev. A 86
- 88
- 4-18 117377-A Rev. A 90
- 92
- 93
- 4-22 117377-A Rev. A 94
- 95
- 96
- Click on Done 99
- 100
- 100
- Editing X.25 Parameters 101
- Configuring X.25 Services 102
- 4-30 117377-A Rev. A 102
- 4-32 117377-A Rev. A 104
- 106
- 108
- 110
- 110
- Deleting X.25 from the Router 111
- Chapter 5 113
- Editing LAPB Parameters 113
- 115
- 115
- 5-4 117377-A Rev. A 116
- 118
- Chapter 6 121
- Editing IPEX Parameters 121
- IPEX > Global 122
- 6-6 117377-A Rev. A 126
- 117377-A Rev. A 6-7 127
- 6-8 117377-A Rev. A 128
- 129
- 6-10 117377-A Rev. A 130
- Figure 6-8. Mapping Type Menu 130
- 131
- 6-12 117377-A Rev. A 132
- 6-14 117377-A Rev. A 134
- 6-16 117377-A Rev. A 136
- 6-18 117377-A Rev. A 138
- 6-20 117377-A Rev. A 140
- 117377-A Rev. A 6-21 141
- Deleting IPEX from the Router 142
- Chapter 7 143
- Editing QLLC Parameters 143
- 7-2 117377-A Rev. A 144
- 117377-A Rev. A 7-3 145
- Click on Add 146
- QLLC Mapping Parameters 148
- 7-10 117377-A Rev. A 152
- Appendix A 155
- Sample IPEX Configurations 155
- A-2 117377-A Rev. A 156
- Sample IPEX Configurations 157
- IPEX Single-Node Switching 158
- 117377-A Rev. A A-5 159
- Appendix B 163
- QLLC Configuration Examples 163
- Upstream QLLC Network 164
- QLLC Configuration Examples 165
- Downstream QLLC Network 166
- Endpoint QLLC Network 168
- Backbone QLLC Network 170
- Appendix C 171
- C-2 117377-A Rev. A 172
- (continued) 173
- C-4 117377-A Rev. A 174
- C-6 117377-A Rev. A 176
- Table C-6. IPEX Parameters 176
- Table C-7. QLLC Parameters 177
- Appendix D 179
- The Mapping Table follows: 180
- (continued) 181
- D-4 117377-A Rev. A 182
- D-6 117377-A Rev. A 184
- D-8 117377-A Rev. A 186
- D-10 117377-A Rev. A 188
- 117377-A Rev. A Index-1 191
- 117377-A Rev. A Index-3 193
- 117377-A Rev. A Index-5 195
- 117377-A Rev. A Index-7 197
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