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Implementation Notes
3-13
PPP Multilink
Multilink is a feature of PPP that you can enable for individual PPP links. Links
are logical communication channels between two routers. Typical links include
one ISDN B channel, one dial-up modem connection, and a leased T1 line.
Multilink enables you to:
• Group lines of different speeds
• Distribute traffic more evenly among the lines
• Restore packet sequence
• Monitor traffic volume (in the context of bandwidth-on-demand)
These features are particularly beneficial for adding bandwidth to relieve a
congested demand circuit. The router activates additional switched lines to relieve
congestion over a demand line.
When you enable multilink, you can group a set of lines between two routers into
a single bundle. Each bundle belongs to a separate circuit. Multilink distributes
traffic over each logical line in a bundle in an amount roughly proportional to the
effective bandwidth of the link.
The router sending information divides the outbound traffic among all the lines in
the bundle, keeping each packet intact. Once data reaches the destination router,
multilink resequences packets arriving on different lines.
Broadcast Traffic across Demand Circuits
Many of the routing protocols that you can select for a demand circuit send update
packets out to the network. Update packets maintain routing tables and gather
information about network resources. For dial-on-demand, the frequency of these
update packets forces the dial-up connection to remain permanent (unless you
configure a time of day to deactivate it). When routers exchange update packets,
the physical connection is established unless you create a filter.
To reduce this type of traffic, you can configure one of the following:
• Static routes
• RIP triggered updates and broadcast timers (for IP)
• RIP and SAP broadcast timers (for IPX)
• Traffic filters
- Configuring Dial Services 1
- Bay Networks Software License 3
- Contents 5
- About This Guide 19
- CompuServe 21
- InfoFACTS 22
- World Wide Web 22
- How to Get Help 23
- Conventions 23
- Acronyms 24
- Chapter 1 27
- Dial Services Overview 27
- Dial-on-Demand Service 29
- Demand Lines and Pools 30
- Activating Demand Circuits 32
- Dial Backup Service 34
- Backup Lines and Pools 36
- Activating the Backup Line 37
- Bandwidth-on-Demand Service 38
- Activating Secondary Lines 40
- Terminating Secondary Lines 40
- Chapter 2 43
- ISDN Overview 43
- ISDN Standards 44
- Primary Rate Interface 45
- The D Channel 45
- Figure 2-3. LAPD Frame 46
- ISDN Interfaces 47
- Reference Points 48
- Chapter 3 51
- Implementation Notes 51
- D Channel Support 52
- B Channel Support 52
- S/T Interfaces 53
- BRI Subaddresses 54
- Selective PRI Service 55
- Call Screening 56
- Rate Adaption 56
- Example 1 57
- Example 2 57
- Point-to-Point Protocol 58
- IP Adjacent Hosts 61
- Data Compression 62
- PPP Multilink 63
- Static Routes 64
- Protocol Prioritization 65
- Breath-of-Life Messages 67
- Bandwidth for Backup Circuits 68
- Chapter 4 79
- Using the MIB Object ID 80
- Configuring Line Pools 80
- Pool ID Parameter 86
- Line Media Type Parameters 86
- Adding Line Pools 87
- Configuring ISDN Lines 91
- PRI Physical Interfaces 93
- MCT1/MCE1 Clock Parameters 97
- MCT1/MCE1 Port Parameters 98
- MCT1 Port Parameters 100
- Creating Line Pools 101
- Configuring Dial Services 102
- MCE1 Port Parameters 105
- MCT1/MCE1 Logical Lines 108
- Logical Lines Parameter 111
- (continued) 113
- (continued) 114
- Configuring ISDN Logical Lines 116
- Logical Lines Parameters 118
- fills in the fields below it 121
- Local Phone Number Parameters 123
- Changing a Line Pool 127
- Changing Lines in a Pool 128
- Port Parameters 134
- Timeslots 134
- Chapter 5 137
- Configuring Circuits 137
- Interface for Dialup Lines 139
- Demand Circuit Parameters 140
- Configuring Circuits 141
- Click on Done 151
- Schedule Parameters 152
- Deleting Demand Circuits 155
- 4. Click on OK to save 157
- Providing Backup Circuits 164
- Click on OK 166
- Circuit Options Parameters 168
- Primary Circuit Parameters 169
- (Figure 5-19) 175
- (Figure 5-20) 176
- Manager window 176
- Deleting Backup Circuits 178
- Click on Done to exit 182
- Congestion Monitor Parameters 189
- (Figure 5-26) 194
- Chapter 6 197
- Configuring Phone Lists 197
- Configuring Phone Lists 199
- Chapter 7 209
- Caller Resolution Table 209
- (Figure 7-2) 210
- Appendix A 217
- Configuration Examples 217
- Dial-on-Demand Using PPP 218
- Demand Pools Configuration 219
- Demand Circuit Configuration 220
- Configuration Examples 221
- Configuration of Router 1 222
- Configuration of Router 2 223
- Demand Pool Configuration 224
- Outgoing Phone List 225
- Protocol Configuration 226
- Backup Circuit Configuration 230
- Backup Pool Configuration 235
- Type)➔Circuit Options window 236
- Appendix B 239
- Appendix C 247
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