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Understanding ATM, ATM Router Redundancy, and OAM
308612-14.00 Rev 00
1-9
The CCITT (now ITU-T) has defined different types of AALs to handle different
kinds of traffic. Nortel Networks ATM routers support a CS function compatible
with AAL 5, as defined in Section 1 of the CCITT (now ITU-T) B-ISDN Protocol
Reference Model (PRM).
In AAL 5, only a trailer attaches to the data from the upper-layer protocols to
create a CS PDU. AAL 5 divides the protocol data unit (PDU) into a 48-octet SAR
PDU; however, it does not add an SAR header and trailer. This 48-octet SAR PDU
becomes the payload of the ATM cell (Figure 1-5
).
Figure 1-5. ATM Adaptation Layer 5
Note: AAL 5 does not attach an SAR header or trailer to the PDU.
Service data unit (SDU)
SAR PDU
ATM cell
SDU
SAR PDU
SAR PDU
ATM cell
ATM cell
AAL 5
convergence
sublayer
AAL 5
SAR
layer
ATM
layer
AAL
layer
Service
class
Trailer
ATM0005A
- 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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