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Configuring ATM Services
5-14
Variable Bit Rate versus Available Bit Rate
Bay Networks currently provides the following ATM ILI pairs:
• An ATM FRE2 link module in conjunction with a Fast Routing Engine
(FRE2) processor
• An ATM Routing Engine link module in conjunction with an ATM Routing
Engine (ARE) processor
Either ILI pair allows the router to connect directly to an ATM network over an
ATM physical interface. However, depending on the ATM ILI pair, the method of
determining bandwidth varies.
Variable Bit Rate
ATM FRE2 ILI pairs use variable bit rate (VBR) to determine bandwidth
allocation. VBR allows the VC to accumulate credits whenever it does not use any
bandwidth within its specified average. When this VC does use bandwidth, the
accumulated credits allow it to transmit using the Peak Cell Rate (PCR).
Available Bit Rate
ATM ARE ILI pairs use available bit rate (ABR) to determine bandwidth
allocation. ABR is a method by which the bandwidth is separated into a
guaranteed portion (for PVCs and Control VCs) and an available portion (for data
SVCs).
Peak Cell Rate
The peak cell rate (PCR) is the upper traffic rate limit for an individual VC. When
setting the PCR, keep the following in mind:
• Each VC can have its own PCR.
• The PCR cannot exceed the maximum rate for the physical media. For
example, you cannot exceed 149.76 Mb/s for a SONET/SDH line.
Note: Bay Networks does not currently incorporate ABR congestion control
features as defined by the ATM Forum.
- 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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