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Understanding ATM, ATM Router Redundancy, and OAM
308612-14.00 Rev 00
1-41
Creating a Network of Adjacent Hosts
You can create a network of routers that are connected by ATM WAN SVCs by
configuring IP or IPX adjacent hosts. On each router, you should configure the
following:
• One WAN SVC service record for each IP subnet or IPX subnetwork
• Adjacent host entries for each router in the same subnet
Each adjacent host you configure has a static mapping to an ATM address. Once
you have configured adjacent hosts, you can specify PCR and SCR settings for the
WAN SVCs to any particular adjacent host by configuring the traffic shaping
parameters.
For information about how to configure traffic shaping, see “Enabling Traffic
Parameters” on page 8-8.
Routing Updates
The way the router sends routing updates over a WAN SVC differs depending on
the number of adjacent hosts per circuit. If you have configured only one adjacent
host per circuit, Nortel Networks recommends that you set the routing mode to
dial-optimized so that the router sends routing updates only when data traffic
causes the router to establish an SVC to the adjacent host.
When you have configured multiple adjacent hosts per circuit, the router should
send routing updates periodically to ensure that all hosts in the subnet have
complete knowledge of the network topology. In this case, you should use the
normal routing mode instead of dial-optimized routing.
For more information about configuring routing updates, see “Changing the
Routing Update Policy” on page 8-5.
PVC Operations and Management Concepts
In most ATM networks, if a PVC fails, the remote device does not receive
notification of the failure at the ATM layer. Instead, the device receives this
information from a non-ATM source such as a routing protocol that operates
above the ATM layer. The PVC Operations and Management (OAM) feature
provides a mechanism by which ATM devices can receive prompt failure
information.
- Configuring ATM Services 1
- Trademarks 2
- Restricted Rights Legend 2
- Statement of Conditions 2
- Contents 5
- 308612-14.00 Rev 00 10
- Before You Begin 19
- Text Conventions 20
- Acronyms 21
- Hard-Copy Technical Manuals 25
- How to Get Help 26
- Chapter 1 27
- Understanding ATM 27
- ATM General Information 28
- Figure 1-2. ATM Cell Header 29
- Data Transmission 30
- VP = Virtual path 31
- VC = Virtual channel 31
- Protocol Prioritization 32
- ATM Layers 32
- ATM0005A 35
- Data Encapsulation Methods 39
- 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 Components 60
- Redundant LES/BUS 61
- LAN Emulation States 62
- Figure 1-14 65
- WAN SVC Concepts 66
- Routing Updates 67
- OAM Loopback 68
- OAM Alarms 68
- For More Information 69
- Chapter 2 71
- Starting ATM Services 72
- Defining PVC Service 73
- Defining Classical IP Service 74
- Defining LEC Service 74
- <vpi_number> 75
- <vci_number> 75
- Adding IP 76
- Adding IPX 76
- Adding PVCs 85
- Redundancy 87
- Deleting ATM from the Router 92
- Chapter 3 95
- Defining the Interface MTU 97
- Using Site Manager 100
- Using the BCC 101
- Assigning the Framing Mode 103
- Specifying DS-3 Line Buildout 105
- Customizing an ATM Interface 111
- Autogenerating ATM Addresses 112
- <integer> 115
- Where to Go Next 116
- Chapter 4 117
- Customizing Signaling 117
- Defining Signaling 118
- Setting Connection Thresholds 125
- Defining Signaling Timers 132
- Defining Retransmissions 141
- Pacing Calls 144
- Defining ILMI 145
- Defining Control VCs 155
- Changing VPI Numbers 156
- Changing VCI Numbers 158
- Table 4-2. Valid PCR Ranges 161
- ) and enter: 166
- Defining SSCOP/Signaling AAL 177
- Modifying SAAL Timers 181
- Defining PDU Values 183
- Chapter 5 189
- Customizing PVC Service 189
- Records and PVCs 189
- Changing the Service Name 193
- Deleting a Service Record 194
- (continued) 195
- Setting the PCR 199
- Setting the SCR 201
- Setting the MBS 203
- Setting the Transmit SDU Size 205
- Setting the Receive SDU Size 207
- PVC to NLPID encapsulation: 209
- Changing PVC OAM Parameters 210
- Copying a PVC 211
- Deleting a PVC 212
- Chapter 6 215
- Chapter 7 227
- Customizing LAN Emulation 227
- Service Records and Clients 227
- Specifying an Owner 242
- Assigning ATM LES Addresses 243
- Changing the LE Server Name 247
- Modifying a LES Entry 249
- Deleting a LES Entry 250
- Setting the Control Timeout 258
- Setting the Aging Time 263
- Setting the Flush Timeout 272
- Specifying a LECS ATM Address 274
- (continued) 275
- Chapter 8 279
- Customizing WAN SVC Service 279
- Records and WAN SVCs 279
- Enabling Traffic Parameters 286
- Chapter 9 295
- Appendix A 299
- Site Manager Parameters 299
- Accessing ATM Parameters 300
- Using the Menu Path 302
- ATM Line Parameters 303
- ATM Interface Parameters 309
- ATM Service Record Parameters 312
- ATM WAN SVC Parameters 325
- LAN Emulation Parameters 330
- LES Parameters 340
- ATM Signaling Parameters 342
- Caution: 346
- ATM ILMI Signaling Parameters 362
- ATM Signaling AAL Parameters 370
- OAM Parameters 375
- ATMARP Parameters 378
- Adjacent Host Parameters 380
- Appendix B 383
- <slot> 384
- <connector> 384
- <servicename> 389
- <ip_address> 391
- show dsx3 circuits 393
- show dsx3 current 394
- show dsx3 history 397
- show sonet circuits 408
- show sonet current 409
- show sonet history 412
- Index-10 426
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