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Configuring DLSw Services
2-14 114063 Rev. A
LLC2 Flow Control
The LLC2 protocol interface provides a bidirectional window and a SAP credit
allocation, that together manage flow control on individual LLC2 connections
between the router and LAN-attached SNA or NetBIOS systems.
The SAP window attempts to limit the number of outstanding frames queued for
transmission to a remote endstation from a local endstation at this SAP address, as
follows.
1. As the local endstation sends frames that the remote endstation has yet to
acknowledge, a counter on the remote DLSw switch increments.
2. When this counter reaches half the value specified in the SAP Window
parameter, the remote DLSw switch sends a flow control indication back to
the local DLSw switch.
3. The local DLSw switch sends RNRs (Receiver Not Ready) to the local
endstation to control the flow of the session.
4. As the remote endstation acknowledges frames, the counter on the remote
DLSw switch decrements.
5. After the remote endstation acknowledges all outstanding frames, the remote
DLSw switch sends an end-flow-control indication back to the local DLSw
switch.
6. The local DLSw switch then sends RR (Receiver Ready) to the local
endstation, thereby allowing it to send more frames.
TCP Flow Control
Each pair of TCP connections between DLSw peers carries data from many LLC2
sessions. When congestion occurs on the TCP/IP network between DLSw peers,
TCP
• Reduces or closes its transmit window
• Signals the local and remote LLC2 interfaces to assert flow control on any
LLC2 connections associated with the congested TCP connections
- Configuring DLSw 1
- Services 1
- Bay Networks Software License 3
- Contents 5
- 114063 Rev. A vii 7
- 114063 Rev. A ix 9
- 114063 Rev. A 10
- 114063 Rev. A xi 11
- 114063 Rev. A xiii 13
- 114063 Rev. A xv 15
- About This Guide 17
- Before You Begin 18
- Conventions 18
- Acronyms 19
- 114063 Rev. A xxi 21
- Bay Networks Customer Service 22
- World Wide Web 23
- Customer Service FTP 23
- Support Source CD 24
- CompuServe 24
- InfoFACTS 25
- How to Get Help 25
- Chapter 1 27
- Data Link Switching Overview 27
- DLSw Networking Overview 28
- RFC1795 Support 29
- 1-4 114063 Rev. A 30
- Single-Switch Services 32
- DSW0002A 33
- Dual-Switch Services 34
- SDLC Support 36
- 1-12 114063 Rev. A 38
- Primary SDLC Support 39
- Secondary SDLC Support 40
- 1-16 114063 Rev. A 42
- (b) Dual-Switch DLSw Networks 43
- Frame Relay Support 44
- DLSw Filtering 46
- Protocol Prioritization 47
- Chapter 2 49
- DLSw Implementation Notes 49
- DLSw Session Setup 50
- Combining DLSw and SRB 51
- 2-4 114063 Rev. A 52
- DSW0009A 52
- Virtual Rings 53
- DLSw and SRB On a Circuit 54
- DLSw and Bridging Services 55
- DLSw with Translation Bridge 56
- 2-10 114063 Rev. A 58
- Multiple DLSw Peers on a LAN 59
- Memory Requirements 60
- TCP Considerations 60
- Flow Control 61
- LLC2 Flow Control 62
- TCP Flow Control 62
- DLSw Prioritization 63
- Chapter 3 65
- DLSw Configuration Overview 65
- 114063 Rev. A 3-3 67
- 3-4 114063 Rev. A 68
- DLSW Global Parameters 69
- DLSw SAP Table 70
- SAP Table 71
- 3-8 114063 Rev. A 72
- DLSw Global Parameters 73
- DLSw Slot Table 74
- DLSw Configuration Overview 75
- 3-12 114063 Rev. A 76
- DLSw Peer IP Table 77
- Broadcast Peers 78
- Unconfigured Peers 79
- SDLC Line Parameters 80
- Local Devices 81
- 3-18 114063 Rev. A 82
- Boundary Access Node (BAN) 83
- 3-20 114063 Rev. A 84
- Configuring DLSw Packaging 85
- 3-22 114063 Rev. A 86
- Chapter 4 87
- Starting DLSw the First Time 88
- 4-4 114063 Rev. A 90
- 2. Click on OK 90
- Adding Slot IP Addresses 92
- 114063 Rev. A 4-7 93
- Adding DLSw Peer IP Addresses 94
- 114063 Rev. A 4-9 95
- 4-10 114063 Rev. A 96
- 1. Click on Add 96
- 114063 Rev. A 4-11 97
- 4-12 114063 Rev. A 98
- 99
- 100
- 101
- 101
- 102
- Starting DLSw 103
- 5. Click on Add 103
- Configuring DLSw Services 104
- 4-18 114063 Rev. A 104
- 105
- 4-20 114063 Rev. A 106
- 4-22 114063 Rev. A 108
- 109
- 4-24 114063 Rev. A 110
- 111
- 4-26 114063 Rev. A 112
- 4-28 114063 Rev. A 114
- Mapping Frame Relay Addresses 115
- 4-30 114063 Rev. A 116
- 3. Click on OK 116
- Chapter 5 119
- Editing DLSw Parameters 119
- Accessing DLSw Parameters 120
- (Figure 5-1) and then: 121
- (Figure 5-2) 121
- Click on OK 122
- 5-6 114063 Rev. A 124
- 5-8 114063 Rev. A 126
- 128
- 5-12 114063 Rev. A 130
- Enabling a DLSw Interface 131
- 5-16 114063 Rev. A 134
- (Figure 5-7) 135
- 114063 Rev. A 5-21 139
- 5-22 114063 Rev. A 140
- 3. Click on Done 140
- 5-28 114063 Rev. A 146
- 2. Click on Delete 146
- Adding a DLSw SAP Table Entry 147
- 114063 Rev. A 5-31 149
- Click on Done 150
- 3. Click on Delete 151
- 5-34 114063 Rev. A 152
- 4. Click on Done 152
- (Figure 5-19) 153
- 5-40 114063 Rev. A 158
- 2. Select the entry to edit 161
- Click on Apply 162
- 5-46 114063 Rev. A 164
- 114063 Rev. A 5-47 165
- 5-48 114063 Rev. A 166
- (continued) 169
- 5-52 114063 Rev. A 170
- (continued) 170
- 5-54 114063 Rev. A 172
- 5-56 114063 Rev. A 174
- 5-58 114063 Rev. A 176
- Deleting DLSw from the Node 177
- Chapter 6 179
- Using DLSw Prioritization 179
- 6-2 114063 Rev. A 180
- DLSw Priority Queues 181
- The Enqueuing Process 182
- The Dequeuing Process 182
- 114063 Rev. A 6-5 183
- 6-6 114063 Rev. A 184
- Queue Depth 185
- 6-8 114063 Rev. A 186
- 114063 Rev. A 6-11 189
- 6-12 114063 Rev. A 190
- 191
- 6-16 114063 Rev. A 194
- 114063 Rev. A 6-19 197
- 114063 Rev. A 6-21 199
- 6-24 114063 Rev. A 202
- 2. Click on Template 202
- 114063 Rev. A 6-29 207
- Configuration window 208
- (Figure 6-23) 208
- Appendix A 211
- DLSw Default Settings 211
- A-2 114063 Rev. A 212
- A-4 114063 Rev. A 214
- Appendix B 215
- Predefined DLSw Criteria 216
- DLSw Reference Points 216
- Length (bits) 217
- Specifying MAC Address Ranges 218
- B-6 114063 Rev. A 220
- Table B-6. SAP Codes 220
- Appendix C 221
- DLSw Troubleshooting 221
- *. Enabled by default 222
- Table C-2. DLSw State Table 223
- Sample Log Entries 224
- C-6 114063 Rev. A 226
- Reviewing the Network Log 228
- C-10 114063 Rev. A 230
- C-12 114063 Rev. A 232
- Troubleshooting DLSw 233
- C-16 114063 Rev. A 236
- Unexpected protocol action 238
- TCP open error 29 238
- DLSw Troubleshooting Tables 239
- C-20 114063 Rev. A 240
- C-22 114063 Rev. A 242
- C-24 114063 Rev. A 244
- C-26 114063 Rev. A 246
- Verifying the WAN Cabling 247
- 114063 Rev. A Index-1 249
- 114063 Rev. A Index-3 251
- 114063 Rev. A Index-5 253
- 114063 Rev. A Index-7 255
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