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Dial Services Overview
308621-14.00 Rev 00
1-19
Knowing When the Primary Line Fails
Depending on the protocol for the primary and backup circuit, the router
determines that the primary circuit failed in one of the following ways:
• No Breath of Life (BofL) messages in the BofL
time period
(Standard and PPP)
For Standard and PPP, the router automatically enables BofL messages on
each primary line and disables them on each backup line. BofL messages
verify that the line is operational. The router determines that the primary line
has failed when it stops receiving packets within the BofL time period.
You can customize the BofL timer. For instructions, see Configuring WAN
Line Services.
• No DLCMI messages (frame relay primary/frame relay backup)
When frame relay is the protocol for the backup circuit, the router performs
link backup. For link backup, the router knows that the primary failed when it
no longer receives DLCMI messages from the switch. These messages
communicate information about the interface and the status of each PVC.
The router may also rely on modem signals to determine whether the primary
circuit failed. If you rely on modem signals, you must enable the sync polling
feature, which instructs the router to monitor modem signals. (See
Configuring WAN Line Services for more information about the Sync Polling
parameter.) In addition, you must use the proper synchronous cable to connect
to the primary line’s modem or CSU/DSU. See the Cable Guide.
• A-bit notification (single frame relay PVC primary/PPP backup)
If only one frame relay PVC is being backed up by PPP, the router performs
circuit backup. For circuit backup, the frame relay service provider must
support A-bit notification, which tells the router the status of the PVC. This
enables the router to back up the PVC if it fails. Without A-bit notification, the
remote side of the PVC is never notified when the local side of the PVC has
terminated, making dial backup service impossible.
- 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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