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X.25 Overview
117377-A Rev. A 1-21
QLLC and DLSw or APPN
You must run DLSw or APPN when you use QLLC. The router transmits the SNA
data contained within QLLC packets over SDLC or LLC (token ring, Ethernet,
frame relay) data links that use DLSw services.
QLLC works with all media that X.25 supports. You can establish as many as 128
simultaneous QLLC VCs on a physical link.
To configure DLSw, see Configuring DLSw Services. To configure APPN, see
Configuring APPN Services.
NPSI
IBM’s NCP Packet Switching Interface (NPSI) software allows SNA hosts to
attach to X.25 networks, and to support virtual circuits for both incoming and
outgoing calls. NPSI makes X.25 virtual circuits appear to SNA hosts as
point-to-point (SDLC) links.
How QLLC Works
The interfaces that you configure for QLLC conversion are the serial interfaces of
the X.25 network that connect to the remote devices with which you want your
local SNA devices to communicate.
Sequence of Connections with QLLC
When an X.25 attached device -- for example, a 3174 -- wants to send data to an
IBM host, the 3174 sends an X.25 call request packet. The IBM host running
NPSI receives the call request, and establishes a QLLC session with the 3174.
- 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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