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117377-A Rev. A 5-1
Chapter 5
Editing LAPB Parameters
The Link Access Procedure Balanced (LAPB) protocol is a subset of the
High-Level Data Link Control (HDLC) protocol, which is an OSI link layer
standard. This chapter describes
• Properties of the LAPB protocol
• Editing LAPB parameters
Properties of the LAPB Protocol
The implementation of the LAPB protocol differs among Bay Networks routers.
On the AN, ANH, ARN, and ASN routers, and BN and LN
routers with the Octal
Sync link module, LAPB is implemented in software. For all other link modules,
LAPB is implemented in the hardware, and you cannot configure LAPB line
parameters.
Bay Networks routers use the services of LAPB to initialize the link between the
router and the local DCE device, and to frame X.25 data packets before
transmitting them to the DCE. X.25 uses the LAPB protocol at the data link
layer to
• Initialize the link between the DTE and the local DCE device
• Frame X.25 data packets before transmitting them to the DCE
The LAPB information field contains the X.25 packets. When an X.25 packet
reaches the destination router, the LAPB protocol strips away the LAPB frame
and delivers the packet to the network layer for further processing.
- 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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