Avaya Configuring ATM Services Bedienungsanleitung Seite 39
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Understanding ATM, ATM Router Redundancy, and OAM
308612-14.00 Rev 00
1-13
Data Encapsulation Methods
Nortel Networks ATM routers support multiprotocol encapsulation (as defined in
RFC 1483), enabling the router to multiplex (combine) and demultiplex (separate)
bridged or routed protocol data units (PDUs).
For transmission, the encapsulation process adds a header from 2 to 8 octets in
length to the PDU to allow decoding. The decoding process determines the proper
service access point (SAP).
When receiving information, the encapsulation method evaluates the header to
determine whether the PDU is a valid routed or bridged cell. If it is valid, the
encapsulation method then strips the header from the cell and passes the cell to the
appropriate SAP for routing or bridging.
You can choose from four data encapsulation types:
• LANE
• LLC/SNAP
• NULL
• NLPID
How you assign a data encapsulation type and which type takes precedence
depends on the virtual circuit type and, for PVCs, the order in which you assign
the encapsulation type.
Each ATM device must encapsulate PDUs before sending them to the SAR
sublayer.
LANE Encapsulation
LANE provides Ethernet (IEEE 802.3) or token ring (IEEE 802.5) encapsulation
of ATM PDUs for transmission over an emulated LAN. You can assign LANE
encapsulation to SVCs only.
- 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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