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Understanding ATM, MPOA, and ATM Router Redundancy Concepts
117374-B Rev. 00
1-5
A virtual path is a set of virtual channels between a common source and
destination. The virtual channels in a virtual path are logically associated with a
common identifier, the virtual path identifier (VPI), that is part of the cell header.
You can base cell switching on either the VPI alone, or on a combination of the
VPI and VCI.
Virtual paths enable you to separate network transport functions into those related
to an individual logical connection (virtual channel) and those related to a group
of logical connections (virtual path).
A transmission path is a physical connection that comprises several virtual paths,
each virtual path containing several virtual channels. The transmission path can
support multiple virtual paths across a single connection to the network.
Figure 1-3
shows the relationships between the virtual channel, the virtual path,
and the transmission path.
Figure 1-3. ATM Transmission Components
VP
VP
VP
VC
VC
VC
Transmission Path
VP = Virtual path
VC = Virtual channel
VC
VC
VC
VP
VP
VP
ATM0006B
- Configuring ATM 1
- Services 1
- Trademarks 2
- Restricted Rights Legend 2
- Statement of Conditions 2
- Contents 5
- 117374-B Rev. 00 10
- About This Guide 19
- Before You Begin 20
- Conventions 20
- Acronyms 21
- Bay Networks Customer Service 24
- How to Get Help 25
- Chapter 1 27
- Understanding ATM, MPOA, and 27
- ATM General Information 28
- Figure 1-2. ATM Cell Header 29
- Data Transmission 30
- VP = Virtual path 31
- VC = Virtual channel 31
- ATM Layers 32
- Table 1-1. Maximum Bandwidth 34
- ATM0005A 35
- Caution: 37
- Data Encapsulation Methods 38
- Encapsulation Rules for PVCs 42
- PVC Access Methods 43
- SVC Access Methods 48
- Assigning ATM Addresses 48
- ATM Traffic Parameters 49
- ARP and Inverse ARP Support 53
- ATM Error Checking 53
- Converting Mb/s to Cells/s 53
- ATM Address Resolution 57
- ATM LAN Emulation Concepts 59
- LAN Emulation Connectivity 60
- LAN Emulation Components 60
- Redundant LES/BUS 61
- LAN Emulation States 62
- MPOA Logical Components 65
- MPOA Basic Elements 66
- ATM00002 68
- Figure 1-15 69
- For More Information 71
- Chapter 2 73
- ATM Router Redundancy 73
- Starting Configuration Tools 74
- Starting ATM Services 74
- Defining PVC Service 76
- Defining Classical IP Service 76
- Defining LEC Service 77
- Adding IP 79
- Adding IPX 79
- Adding PVCs 85
- Starting the MPOA Server 86
- Configuring the MPS 89
- Redundency 91
- Deleting ATM from the Router 95
- Chapter 3 99
- Using the BCC 100
- Defining the Interface MTU 101
- Using Site Manager 102
- Assigning the Framing Mode 107
- Specifying DS-3 Line Buildout 109
- Customizing an ATM Interface 115
- Autogenerating ATM Addresses 116
- Where to Go Next 120
- Chapter 4 121
- Customizing Signaling 121
- Defining Signaling 122
- Setting Connection Thresholds 129
- Defining Signaling Timers 135
- Configuring ATM Services 136
- Defining Retransmissions 142
- Pacing Calls 145
- Defining ILMI 146
- Defining Control VCs 154
- Changing VPI Numbers 155
- Changing VCI Numbers 157
- ) and enter: 158
- Table 4-2. Valid PCR Ranges 160
- Defining SSCOP/Signaling AAL 176
- Modifying SAAL Timers 180
- Defining PDU Values 182
- Chapter 5 189
- Customizing PVC Service 189
- Records and PVCs 189
- Deleting a Service Record 193
- Setting the PCR 197
- Setting the SCR 199
- Setting the MBS 201
- Setting the Transmit SDU Size 202
- Setting the Receive SDU Size 204
- PVC to NLPID encapsulation: 206
- Copying a PVC 207
- Deleting a PVC 208
- Chapter 6 211
- Chapter 7 223
- Customizing LAN Emulation 223
- Service Records and Clients 223
- Specifying an Owner 237
- Assigning ATM LES Addresses 238
- Modifying a LES/BUS Entry 243
- Deleting a LES Entry 244
- Setting the Control Timeout 251
- Setting the Aging Time 255
- (continued) 261
- Setting the Flush Timeout 263
- Specifying a LECS ATM Address 265
- Chapter 8 271
- (continued) 275
- Defining MPS Timers 280
- Setting the Give Up Time 284
- Defining MPS Cache Values 286
- Maximum Cache Size 287
- Deleting an Individual MPS 288
- Chapter 9 291
- Appendix A 295
- Site Manager Parameters 295
- Accessing ATM Parameters 296
- Using the Menu Path 297
- ATM Line Parameters 298
- ATM Interface Parameters 304
- ATM Service Record Parameters 307
- LAN Emulation Parameters 318
- LES Parameter Descriptions 327
- ATM Signaling Parameters 329
- ATM ILMI Signaling Parameters 340
- ATM Signaling AAL Parameters 347
- MPOA Parameters 351
- NHRP Parameters 359
- Adjacent Host Parameters 370
- Appendix B 373
- <slot> 374
- <connector> 374
- <servicename> 378
- <ip address> 381
- (flag) and filter argument: 386
- Appendix C 391
- NHRP Overview 392
- Configuring NHRP 393
- Editing an NHRP Record 399
- Disabling an NHRP Record 400
- Deleting NHRP 400
- Index-10 410
- Index-11 411
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