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Configuring ATM Services
2-12
If you define the PVCs in
hybrid access mode, as shown in Figure 2-6, each PVC
acts as a bridge port. This enables the bridge running on the ATM interface to
view the traffic from Site A as arriving on a different port than that of Site B.
When the bridge sends out data, it now has access to all of its ports, including the
port that accesses Site B. Therefore, data from Site A can reach Site B.
Using Hybrid Access for Routing
In hybrid access mode, routing protocols view the ATM network interface in terms
of group access PVCs, as described in the “Group Access” section, earlier in this
chapter.
Multipath Support
Our implementation of ATM DXI provides a redundancy multipath feature. This
means, for example, that if there are two physical lines and one line fails, the other
takes over the task of transmission (redundancy). If both lines are working, the
router uses both lines simultaneously (multipath).
The multipath feature lets you group several lines that back up one another to
ensure that information makes it across the network. Figure 2-8 shows a network
with two physical links across the ATM network.
Figure 2-8. Multipath Network
In this example, when the router receives traffic destined for the network, it
alternately chooses Path A or Path B, at random, to transmit the data. The router
uses both lines, simultaneously, to balance the load. If one of these connections
fails, the router uses the remaining path.
Path A
Path B
Router
ATM
Network
Router
- Configuring ATM Services 1
- Bay Networks Software License 3
- (continued) 4
- Contents 5
- About This Guide 19
- CompuServe 21
- InfoFACTS 21
- How to Get Help 22
- Conventions 22
- Acronyms 23
- Chapter 1 27
- ATM Overview 27
- Cell Header 28
- Cell Information Field 29
- ATM Layers 30
- Data Transmission 33
- ATM DXI versus ATM 34
- For More Information 35
- Chapter 2 37
- ATM DXI Support 38
- AAL Sublayer Support 39
- ATM DXI LMI Support 40
- ATM DXI Error Checking 40
- ATM DXI Implementation Notes 41
- ATM DXI Modes of Operation 42
- Group Access Mode 44
- Direct Access Mode 45
- Hybrid Access Mode 45
- Site A Site B 47
- Multipath Support 48
- Chapter 3 51
- Enabling ATM DXI Service 51
- Click on Add 55
- Chapter 4 59
- Editing ATM DXI Parameters 59
- 64
- Configuring PVCs 65
- 73
- 74
- Deleting PVCs 82
- Chapter 5 85
- ATM Support 86
- Multiprotocol Encapsulation 87
- ARP and Inverse ARP Support 88
- LAN Emulation 88
- ATM Signaling 89
- ATM Error Checking 90
- ATM Implementation Notes 91
- Hybrid Access 94
- SVC Access Methods 96
- ATM Traffic Parameters 96
- Converting Mb/s to Cells/s 97
- Variable Bit Rate 98
- Available Bit Rate 98
- Configuring ATM Services 100
- Maximum Burst Size 101
- Chapter 6 103
- Enabling ATM Service 103
- Enabling Overview 104
- Adding an ATM Circuit 104
- Click on OK 105
- Adding a Service Record 109
- Figure 6-4) 110
- 2. Click on Add 111
- 2. Click on OK 116
- Adding PVCs 118
- Chapter 7 121
- ATM Editing Basics 121
- Accessing ATM Windows 122
- Configuring 124
- Line Services 124
- Selecting Service Attributes 126
- Selecting Line Attributes 131
- Selecting ATM Signaling 132
- Selecting SAAL Attributes 134
- Selecting ILMI Attributes 136
- Assigning Data Encapsulation 138
- LANE 802.3 139
- LLC/SNAP Encapsulation 139
- Encapsulation Rules for PVCs 140
- Using ATM Protocol Menus 141
- Deleting Individual PVCs 149
- Click on PVC 150
- Click on Delete 150
- Site Manager deletes the PVC 150
- Deleting Individual SVCs 151
- Deleting ATM from the Router 154
- Chapter 8 155
- Editing Service Attributes 156
- Adding Service Records 157
- Figure 8-1) 158
- 162
- 163
- Adding or Copying PVCs 167
- Copying a PVC 169
- 7. Click on OK 170
- Editing PVC Parameters 172
- 8. Click on OK 174
- 183
- 183
- Chapter 9 195
- Click on Apply 210
- 216
- Editing ILMI Attributes 220
- Appendix A 231
- Appendix B 239
- ATM LAN Emulation Overview 239
- LAN Emulation Components 240
- LAN Emulation Server 241
- Broadcast and Unknown Server 241
- Initial State 243
- LECS Connect State 243
- Configure State 243
- Join State 243
- Initial Registration State 244
- BUS Connect State 244
- Operational State 244
- Appendix C 245
- ATM Address Resolution 247
- Adding an Adjacent Host 256
- 258
- Deleting an Adjacent Host 260
- Appendix D 265
- Sample ATM Network 265
- Hardware Devices 267
- Role of the CMS 269
- Role of the MCS 269
- Role of the ATM NMA 270
- Click on Service Attributes 271
- 10. Click on OK 274
- Appendix E 275
- ATM Sample Log 275
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