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Implementation Notes
3-5
BRI Floating B Service for the AN and ANH
If your ISDN service provider only offers 2B + D service, the floating B option for
the AN and ANH enables you to use only one B channel for dial service
applications. Floating B is an alternative if you cannot purchase 1B + D service.
Prior to the floating B option, if your service provider offered only 2B + D service,
the AN’s and ANH’s CPU would use two of its four Serial Communications
Controllers (SCCs) for the two B channels, one SCC for the Ethernet link, and one
SCC for a synchronous link. With floating B, you can use only one B channel,
freeing up an SCC for an additional synchronous link.
You can use Floating B if your network integrates a dial backup application that
uses ISDN B channels with network devices that send protocol traffic such as
SDLC or X.25. This type of application requires the following interfaces:
• One synchronous interface for SDLC, X.25 traffic
• One synchronous interface for the primary link to the backbone network
• One ISDN B channel for the dial backup link
Using 2B + D service without configuring floating B, the AN provides only one
synchronous interface, so you cannot integrate the dial service with other network
applications. However, by configuring floating B, you can configure two
synchronous interfaces, one Ethernet link, and one B channel. The router software
maps whichever B channel is in use to a single SCC.
To implement floating B operation, select Dialup – Floating B as the Port
Application Mode (refer to Chapter 4). This ensures that the router makes the
necessary adjustments for the use of only one B channel.
Selective PRI Service
Your ISDN provider may offer a service option using only a fixed number of PRI
B channels out of the full complement of B channels. This fixed number of
channels is offered at a very economical rate.
The ISDN switch provider limits the number of channels by keeping the
unavailable channels busy. Consequently, the router can use only what is
available.
- 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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