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Dial-on-Demand Implementation Notes
117353-B Rev. 00
6-19
Traffic Filters
To prevent routing updates and protocol-specific messages from keeping the
circuit active, you can configure traffic filters that specify which packets are
permitted across an established dial-up line and which packets are prevented from
activating a dial-up line. Traffic filters enable the router to selectively relay or drop
a packet, frame, or datagram, based on standard protocol fields or user-defined
fields.
If you implement inbound filters, the router drops unwanted packets at the
interface where it receives data. By filtering incoming data, you can prevent
unwanted packets from going to the destination interface.
If you implement outbound filters, the router drops unwanted packets before
dialing a line. The router continues to filter the data so that unwanted packets do
not keep the circuit active.
You can also filter outbound packets to prevent the inactivity time from resetting.
For example, RIP packets can always be sent, but if no other data is sent, the
inactivity time expires and the line is deactivated.
To set up traffic filters, see Configuring Traffic Filters and Protocol Prioritization.
Data Compression
You can configure one of two compression protocols over any PPP demand
circuit:
• Bay Networks proprietary data compression protocol, WCP.
• Hi/fn LZS
Enabling compression improves bandwidth efficiency by eliminating redundant
strings in data streams. This, in turn, improves network response times and yields
line-cost savings.
To implement data compression, you select either WCP or Hi/fn LZS as one of the
protocols for the demand circuit. To configure protocols for the demand circuit,
see Chapter 10. Note that WCP does not work with any other vendor’s
compression protocol.
For more information about data compression, see Configuring Data Compression
Services.
- Configuring 1
- Dial Services 1
- Trademarks 2
- Restricted Rights Legend 2
- Statement of Conditions 2
- Contents 5
- 117353-B Rev. 00 10
- About This Guide 23
- Before You Begin 24
- Conventions 24
- Acronyms 25
- Bay Networks Customer Service 27
- How to Get Help 27
- Chapter 1 29
- Dial Services Overview 29
- How to Use This Guide 30
- Bay Networks Dial Services 31
- Dial-on-Demand Service 33
- Demand Lines and Pools 34
- Demand Circuit Protocols 36
- Activating Demand Circuits 38
- Terminating Demand Circuits 39
- Dial Backup Service 42
- Figure 1-8 44
- Backup Lines and Pools 46
- Activating the Backup Line 48
- Bandwidth-on-Demand Service 50
- Terminating Secondary Lines 54
- Chapter 2 57
- Starting Dial Services 57
- Setting Up a Dial Service 58
- Appendix A of this guide 61
- (Figure 2-1) 61
- Configuring Line Pools 62
- Configuring BRI Lines 64
- Configuring PRI Lines 66
- Configuring WAN Line 67
- Services 67
- Adding ISDN Lines to a Pool 68
- Configuring Circuits 70
- Enabling a Protocol 73
- Creating Dial Backup Circuits 74
- Specifying the Backup Mode 75
- Creating Bandwidth Circuits 77
- Specifying the Bandwidth Mode 78
- Chapter 3 87
- Starting Dial Backup 87
- Configuring WAN Line Services 89
- DS0036A 91
- Create a Dial Object 94
- Create a Backup Line Pool 95
- Add a Backup Line to the Pool 96
- Configure BRI Lines 97
- Configure PRI Lines 99
- Specify the ISDN Switch Type 100
- Configuring Dial Services 102
- What to Do Next 105
- Chapter 4 107
- ISDN Overview 107
- ISDN Standards 108
- Primary Rate Interface 109
- The D Channel 109
- Figure 4-3. LAPD Frame 110
- ISDN Interfaces 111
- Reference Points 112
- Chapter 5 115
- Implementation Notes 115
- Types of Authentication 116
- Asynchronous PPP 120
- RADIUS Accounting Services 123
- ISDN Services 123
- Incoming Call Filtering 129
- Rate Adaption 130
- Example 2 131
- Chapter 6 135
- How Standby Circuits Work 137
- Callback 142
- Configuring Callback 143
- Demand Circuit Groups 145
- Static Routes 149
- Dial Optimized Routing 149
- Data Compression 153
- PPP Multilink 154
- Protocol Prioritization 154
- Chapter 7 157
- Bandwidth for Backup Circuits 158
- Chapter 8 163
- Multilink Fragmentation 166
- How BAP Works 167
- Chapter 9 173
- Customizing Line Pools 173
- Modifying Line Pools 174
- Changing Pool IDs 175
- Deleting Pools 175
- For example: 176
- To delete any type of pool: 176
- Using the BCC 177
- Using Site Manager 178
- Modifying the Line Priority 184
- Using Modem Factory Defaults 186
- Selecting a Modem Type 194
- Remotely Resetting the Modem 200
- Enabling RFC 1661 Compliance 205
- Modifying ISDN Configurations 206
- Modifying the Adaption Rate 213
- To modify the X.25 circuit: 224
- Deleting BRI 228
- Deleting PRI 229
- Chapter 10 231
- Customizing Demand Circuits 231
- Removing Demand Circuits 246
- Chapter 11 247
- Customizing Backup Circuits 247
- <ID_number> 249
- <mode> 249
- Frame Relay Services 250
- Specifying the Redial Count 263
- (continued) 265
- To remove backup service: 270
- Chapter 12 271
- Chapter 13 281
- Customizing Phone Lists 281
- Caution: 282
- Local Phone Lists 283
- Adding Phone Numbers 284
- To set the adaption rate: 293
- Changing the Remote Pool Type 294
- To set the connection type: 296
- Enabling PRI Multirate 297
- To enable PRI multirate: 298
- To create a local phone list: 305
- Chapter 14 309
- Customizing Caller Resolution 309
- Appendix A 315
- Dial Service Parameters 315
- Pool ID Parameter 318
- External Modem Parameters 323
- V.34 Modem Parameters 329
- ISDN Switch Parameters 334
- BRI Configuration Parameters 341
- Relay window is similar 346
- Local Phone Number Parameters 403
- Appendix B 423
- Configuration Examples 423
- Dial-on-Demand with PPP 424
- Table B-3. IP Parameters 426
- Configuration of Router 1 429
- Configuration of Router 2 429
- Demand Circuit Configuration 431
- Table B-13. IP Parameters 432
- Appendix C 453
- Show Commands for Dial Backup 453
- Sample Output 454
- Online Help for show Commands 454
- Commands for Dial Backup 455
- show dial backup summary 456
- >] [-circuit < 457
- Line Information: (Serial) 458
- Appendix D 465
- Ordering PRI Lines 466
- Appendix E 467
- (continued) 469
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