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Using DLSw Prioritization
114063 Rev. A 6-3
DLSw Priority Queues
This section describes how DLSw protocol prioritization works, and defines
DLSw terms.
Although similar to the existing circuit-level protocol prioritization, DLSw
prioritization is not limited to synchronous interfaces and does not operate at the
driver level. DLSw prioritization occurs before TCP sequences packets, where the
Data Link Control (LLC2 or SDLC) and TCP function.
The router sorts packets into priority queues as described later in “The Enqueuing
Process.” The router then drains (dequeues) the priority queues to transmit packets
according to a weighted allocation algorithm, described later in “
The Dequeuing
Process.”
Based on the needs of your site, you can configure up to ten queues for each
DLSw peer. You can create queues for traffic with specific MAC or SAP address
ranges or, for SNA traffic, based on criteria in the SNA Transmission Header
(FID2 and FID4). You determine whether a queue applies to all DLSw peers or to
one or more specific configured peers.
Default and Peer-Specific DLSw Queues
To set the way the router handles priority queues for all DLSw traffic (including
unconfigured peers), you use the default DLSw queue configuration. To customize
the handling of queued traffic for a particular configured peer, you configure
peer-specific priority queues that apply to that peer’s IP address only.
The default priority queue configuration applies to all configured DLSw peers
except those individual peers for which you configure a custom priority queue.
Peer-specific queues they take precedence over the default queue.
Note: You can apply both circuit-level prioritization and TCP-level
prioritization to DLSw traffic. Note that TCP-level prioritization alone does
not give DLSw traffic precedence over other routing protocols. For
information about circuit-level prioritization, refer to Configuring Traffic
Filters and 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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