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Dial Services Overview
308621-14.00 Rev 00
1-25
Activating Dial-Up Lines to Relieve Congestion
If one dial-up line from the bandwidth pool does not relieve the congestion, the
router adds up to 29 lines until the congestion is relieved. The router activates
additional lines only for a congested line, not for a failed line.
PPP multilink detects a state of congestion based on byte counts and the
user-defined monitor parameters. (For routers running BayRS Version 12.10 or
later, byte counts are measured after data compression.) The monitor parameters
let you define congestion thresholds for the leased or demand circuit. If data traffic
exceeds a threshold, the router tries to activate a dial-up line. At this point, if you
configure BAP, it manages the addition and removal of lines from the multilink
bundle, based on the monitor parameters. For more details about BAP, see
Chapter 8, “Bandwidth-on-Demand Implementation Notes.”
After the volume of traffic on the congested line falls below the congestion
threshold, the router again uses only the leased line, demand line, or bundle. For
details about the monitor parameters, see “Monitoring Congestion on the
Bandwidth or Demand Circuit” on page 14-3.
Terminating Secondary Lines
The router terminates secondary lines when:
• The leased circuit is no longer congested.
• The leased line or multilink bundle fails.
• The remote router terminates the connection.
• There is a physical problem with the dial-up line.
Bandwidth-on-Demand Lines and Pools
A bandwidth-on-demand pool is a collection of dial-up lines that a congested
leased line, demand line, or multilink bundle can use. Each bandwidth-on-demand
pool is identified by a bandwidth-on-demand pool ID.
In a bandwidth-on-demand pool, you can combine asynchronous, synchronous, or
ISDN lines in a single pool. Lines in a backup pool can connect to a modem,
directly to a PSTN (using the ARN with the V.34 Modem Adapter Module), or
directly to an ISDN network (using a router with internal ISDN capability).
- Configuring Dial Services 1
- Trademarks 2
- Restricted Rights Legend 2
- Statement of Conditions 2
- Contents 5
- 308621-14.00 Rev 00 10
- Before You Begin 25
- Text Conventions 26
- Set Trap Monitor Filters 27
- Acronyms 28
- Hard-Copy Technical Manuals 30
- How to Get Help 30
- Chapter 1 31
- Dial Services Overview 31
- How to Use This Guide 32
- Nortel Networks Dial Services 33
- Dial-on-Demand Service 35
- Terminating Demand Circuits 36
- Demand Lines and Pools 38
- Demand Circuit Protocols 40
- Dial Backup Service 44
- Activating the Backup Line 45
- Backup Circuit Protocols 46
- Backup Lines and Pools 50
- Bandwidth-on-Demand Service 52
- Terminating Secondary Lines 55
- Chapter 2 59
- Starting Dial Services 59
- Setting Up a Dial Service 60
- Appendix A of this guide 63
- (Figure 2-1) 63
- Configuring Line Pools 64
- • Configuring BRI Lines 66
- on page 2-9 66
- Configuring BRI Lines 67
- Adding ISDN Lines to a Pool 71
- Configuring Circuits 72
- Enabling a Protocol 76
- Specifying the Backup Mode 78
- Creating Bandwidth Circuits 80
- Specifying the Bandwidth Mode 81
- Chapter 3 91
- <parameter> 93
- DS0037A 97
- Configuring a Modem Interface 100
- Configuring an ISDN Interface 102
- Configuring PRI Lines 104
- Creating a Line Pool 105
- Adding Lines to the Pool 106
- <mode> 109
- Protocols for Backup Circuits 110
- <string> 111
- What to Do Next 114
- Chapter 4 115
- ISDN Overview 115
- ISDN Standards 116
- Primary Rate Interface 117
- D Channel 117
- Figure 4-3. LAPD Frame 118
- ISDN Interfaces 119
- Reference Points 120
- Chapter 5 123
- Implementation Notes 123
- Types of Authentication 124
- WAN Encryption Protocol 128
- Asynchronous PPP 128
- ISDN Services 132
- Incoming Call Filtering 138
- Rate Adaption 139
- Example 2 140
- Chapter 6 143
- Standby Circuits 144
- How Standby Circuits Work 145
- Callback 147
- Configuring Callback 148
- Demand Circuit Groups 149
- Static Routes 150
- Dial-Optimized Routing 151
- Traffic Filters 154
- Data Compression 155
- PPP Multilink 156
- Protocol Prioritization 157
- Chapter 7 159
- Bandwidth for Backup Circuits 160
- Chapter 8 165
- Multilink Fragmentation 168
- How BAP Works 169
- Chapter 9 175
- Customizing Line Pools 175
- Changing Pool IDs 176
- Deleting Pools 176
- Using the BCC 177
- Using Site Manager 177
- <integer> 178
- Disabling MRU Compliance 181
- Chapter 10 183
- Customizing Modem Lines 183
- Modifying the Line Priority 187
- Using Modem Factory Defaults 189
- 34 characters 196
- is enabled or disabled 198
- For example: 198
- Resetting the Modem Remotely 200
- Chapter 11 205
- Customizing ISDN Lines 205
- Modifying the Adaption Rate 213
- Configuring the TEI Type 216
- Configuring the TEI Value 217
- Modifying the BRI T4 Timer 221
- Changing the Circuit Name 224
- Modifying the MTU 224
- Chapter 12 229
- Customizing Demand Circuits 229
- Adding a Service Record 233
- Adding or Modifying PVCs 234
- Retrying the Connection 239
- <text-string> 245
- Setting the Inactivity Mode 250
- Configuring Standby Circuits 254
- <failback_mode> 256
- <action> 257
- Enabling Callback 259
- Deleting a Schedule 273
- Removing Demand Circuits 280
- Deleting Hot Standby Circuits 281
- Chapter 13 283
- Customizing Backup Circuits 283
- <ID_number> 285
- ID_number 285
- Specifying the Redial Count 299
- (continued) 300
- To remove backup service: 305
- Chapter 14 307
- Chapter 15 317
- Customizing Phone Lists 317
- Local Phone Lists 319
- Adding Phone Numbers 320
- Changing the Remote Pool Type 329
- To set the remote pool type: 330
- Enabling PRI Multirate 332
- can be one of the following: 341
- To create a local phone list: 341
- Chapter 16 345
- Customizing Caller Resolution 345
- Configuring the CHAP Secret 348
- Configuring the PAP Password 348
- Appendix A 353
- Site Manager Parameters 353
- Caution: 355
- Pool ID Parameter 356
- External Modem Parameters 361
- V.34 Modem Parameters 367
- ISDN Switch Parameters 372
- BRI Configuration Parameters 379
- Figure A-11 407
- Parameters 434
- Local Phone Number Parameters 442
- Appendix B 463
- Configuration Examples 463
- Dial-on-Demand with PPP 464
- Demand Circuit Configuration 469
- Configuration of Router 1 473
- Configuration of Router 2 474
- Backup Pool Configuration 491
- backup-line bri/3/2/1 497
- Appendix C 507
- BCC show Commands 507
- show dial backup circuits 508
- Online Help for show Commands 509
- Commands for Dial-on-Demand 510
- Demand Circuit Information 512
- <circuit_name> 516
- -caller 517
- -circuit 518
- Commands for Dial Backup 519
- Modem Commands 530
- Receive Errors 533
- Transmit Errors 533
- System Errors 533
- Appendix D 537
- Ordering PRI Lines 538
- Appendix E 539
- (continued) 541
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