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DLSw Implementation Notes
114063 Rev. A 2-13
TCP Max Retransmission Timeout
The setting for the TCP Max Retransmission Timeout parameter determines the
maximum time between successive retransmissions. TCP performs calculations
that increase the time between data retransmissions to minimize network loading
during peak periods when there is an increased risk of lost data. TCP starts a
minimum retransmission time before increasing to the Max Retransmission
Timeout setting with successive retransmissions. Decreasing the Max
Retransmission Timeout decreases the notification time by reducing the time
between intervals. This also slows network traffic in congested, connected
networks.
In large networks with many routers, quick notification of a failed router or link is
necessary. However, when some routers use a low setting for the Max
Retransmission Timeout parameter, other routers using the default setting may
cause inconsistent results. This means that some of the routers time out and report
the lost TCP connections quickly, while other routers using the default setting
may take up to 20 minutes.
The default setting for the Max Retransmission Timeout is 240000 ms
(4 minutes), yielding a default time for learning of a lost TCP connection of
approximately 20 minutes. Refer to Configuring IP Utilities for information on
editing the Max Retransmission Timeout parameter setting.
Flow Control
DLSw uses the following two flow control mechanisms to provide reliable
end-to-end delivery of packets:
• LLC2 flow control
• TCP flow control
TCP and LLC2 continue to assert flow control until congestion clears on a given
TCP connection.
The default settings for system parameters relevant to LLC2 and TCP flow control
are suitable for the majority of your DLSw service requirements. With RFC 1795,
the router supports adaptive rate pacing.
- 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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