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Configuring DLSw Services
6-4 114063 Rev. A
The Enqueuing Process
The router enqueues packets that match a DLSw priority filter as follows:
1. Applies filter rules.
2. Stamps packets with a queue number.
3. Places packets in appropriate queues.
The router holds packets in the assigned priority queue according to how you
configure DLSw protocol prioritization.
Based on the needs of your site, you can configure up to ten queues (Q0 to Q9) for
each DLSw peer. For example, you could assign a separate queue for each filter
criterion, for specific address ranges, or for particular DLSw peers.
When you enable DLSw protocol prioritization, you distribute the available
bandwidth for a configured DLSw peer among its priority queues. The combined
bandwidth of each peer’s queues totals 100 percent.
By default, there are two DLSw priority queues: Q0 receives 60 percent of the
bandwidth and Q1 receives 40 percent.
Nonordered Queues
Although Site Manager numbers the DLSw priority queues, the queue number
hierarchy does not determine priority. You configure both the number of queues
for each DLSw peer and the percentage of bandwidth assigned to each queue. For
example, you could assign 50 percent of available bandwidth to Q3 and 25 percent
each to Q1 and Q0.
The Dequeuing Process
The algorithm for DLSw bandwidth allocation is called weighted dequeuing. With
weighted dequeuing, packets at the front of the protocol prioritization queues
enter a dequeue list and receive a weighted score. Packets with the lowest score
are transmitted first.
By distributing the selection of packets from all queues, weighted dequeuing is
more stable than the algorithms used for circuit-level WAN protocol prioritization.
- 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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