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About Line Protocols
115391-A Rev. A 2-7
Figure 2-4 shows the relationship of the four FDDI standards.
Figure 2-4. Relationship of FDDI Standards
FDDI Dual Counter-Rotating Ring Architecture
FDDI LANs comprise two independent, counter-rotating rings: a primary ring
and a secondary ring. Data flows in opposite directions on the rings. Both rings
can carry data; however, in high-bandwidth applications, Bay Networks specifies
that the primary ring transmits data and the secondary ring is a backup device.
The counter-rotating ring architecture prevents data loss in the event of a link
failure, a node failure, or the failure of both the primary and secondary links
between any two nodes, as follows:
• If a link on the primary ring fails, the secondary ring transmits the data.
• If a node or corresponding links on both the primary and secondary rings fail,
one ring wraps to the other around the faulty components, forming a single
ring (Figures 2-
5 and 2-6).
When the component can function again, the architecture reverts to dual-ring.
Media Access Control (MAC)
Station
Management
(SMT)
Physical Layer Protocol (PHY)
Physical Layer Medium Dependent (PMD)
LS0006A
- Configuring Line 1
- Services 1
- Bay Networks Software License 3
- Contents 5
- 115391-A Rev. A 10
- About This Guide 21
- <ip_address> 22
- Acronyms 23
- World Wide Web 29
- Customer Service FTP 29
- Support Source CD 30
- CompuServe 30
- InfoFACTS 31
- How to Get Help 31
- Chapter 1 33
- Getting Started 33
- 1-2 115391-A Rev. A 34
- Click on Edit 35
- Select Lines > Edit Lines 36
- Chapter 2 39
- About Line Protocols 39
- Ethernet Overview 40
- 2-4 115391-A Rev. A 42
- FDDI Overview 43
- 2-6 115391-A Rev. A 44
- 2-8 115391-A Rev. A 46
- Station Timers 48
- SMT Frame Services 50
- Token Ring Overview 52
- Figure 2-7. Token Ring LAN 53
- Overview of WAN Protocols 54
- HSSI Overview 55
- ISDN Overview 55
- MCE1 and MCT1 Overview 56
- Synchronous Overview 56
- T1 Overview 57
- 2-20 115391-A Rev. A 58
- Figure 2-8. D4 Frame 58
- 2-22 115391-A Rev. A 60
- Figure 2-10. Bipolar Format 60
- Chapter 3 63
- Customizing LAN Interfaces 63
- Setting the BofL Interval 64
- 3-4 115391-A Rev. A 66
- 3-6 115391-A Rev. A 68
- Editing FDDI Lines 69
- 115391-A Rev. A 3-9 71
- 3-10 115391-A Rev. A 72
- 3-12 115391-A Rev. A 74
- Editing FDDI Path Attributes 76
- Editing FDDI Port Attributes 78
- Editing Token Ring Lines 79
- Specifying the Ring Speed 80
- Chapter 4 81
- Customizing WAN Interfaces 81
- 4-2 115391-A Rev. A 82
- Setting the Framing Mode 84
- Editing ATM FRE-2 Lines 86
- 4-8 115391-A Rev. A 88
- Editing E1 Lines 90
- Assigning Channel Functions 92
- Editing HSSI Lines 93
- Editing T1 Lines 96
- Setting the T1 Frame Type 97
- 4-18 115391-A Rev. A 98
- Chapter 5 101
- Customizing Synchronous and 101
- Asynchronous Interfaces 101
- Specifying the Start Protocol 102
- 115391-A Rev. A 5-3 103
- Setting the Idle Timer 104
- Setting the Baud Rate 104
- 115391-A Rev. A 5-5 105
- Editing Synchronous Lines 106
- 115391-A Rev. A 5-7 107
- Setting the BofL Timeout 108
- Setting the Clock Source 109
- Configuring Line Services 110
- 5-10 115391-A Rev. A 110
- Setting the Signal Mode 111
- 5-12 115391-A Rev. A 112
- Setting Minimum Frame Spacing 113
- 5-14 115391-A Rev. A 114
- 115391-A Rev. A 5-15 115
- Setting the CRC Size 116
- Setting the Signaling Method 116
- Setting the Line Coding 117
- Setting the Retry Count 118
- Setting the Link Idle Timer 118
- Setting the Cable Type 119
- 5-20 115391-A Rev. A 120
- Setting Sync Priority 121
- Configuring KG84A Security 121
- 5-22 115391-A Rev. A 122
- 115391-A Rev. A 5-23 123
- 5-24 115391-A Rev. A 124
- Chapter 6 125
- 6-2 115391-A Rev. A 126
- Setting the Clock Parameters 127
- Customizing MCE1 Port Details 128
- 115391-A Rev. A 6-5 129
- 6-6 115391-A Rev. A 130
- Customizing MCT1 Port Details 131
- 6-8 115391-A Rev. A 132
- 115391-A Rev. A 6-9 133
- 6-10 115391-A Rev. A 134
- 115391-A Rev. A 6-11 135
- 6-12 115391-A Rev. A 136
- 115391-A Rev. A 6-13 137
- Defining Logical Lines 139
- 115391-A Rev. A 6-17 141
- Customizing Logical Lines 142
- 115391-A Rev. A 6-19 143
- 6-20 115391-A Rev. A 144
- 115391-A Rev. A 6-21 145
- 6-22 115391-A Rev. A 146
- 115391-A Rev. A 6-23 147
- 6-24 115391-A Rev. A 148
- Assigning Timeslots 149
- 115391-A Rev. A 6-27 151
- 115391-A Rev. A 6-29 153
- Chapter 7 155
- Configuring Multiline Services 155
- Multiline Example 156
- Types of Multiline Circuits 157
- Grouping Data Paths 158
- Multiline Traffic Distribution 159
- Frame Relay Considerations 160
- Bandwidth-on-Demand (BOD) 160
- Configuring Multiline 161
- 115391-A Rev. A 7-9 163
- 115391-A Rev. A 7-11 165
- 115391-A Rev. A 7-13 167
- 115391-A Rev. A 7-15 169
- Select File > Exit 170
- 115391-A Rev. A 7-17 171
- Chapter 8 173
- Resource Manager 173
- Line Resource Manager 174
- Starting the LRM 175
- 115391-A Rev. A 8-5 177
- Configuring the LRM 178
- 115391-A Rev. A 8-7 179
- 8-8 115391-A Rev. A 180
- 115391-A Rev. A 8-9 181
- 8-10 115391-A Rev. A 182
- 115391-A Rev. A 8-11 183
- Deleting LRM Services 184
- 115391-A Rev. A 8-13 185
- Chapter 9 187
- Starting PPP 187
- PPP Tasks 188
- • Configure echo requests 189
- Chapter 10 191
- PPP Concepts 191
- 10-2 115391-A Rev. A 192
- Initializing a PPP Interface 193
- 10-4 115391-A Rev. A 194
- 10-6 115391-A Rev. A 196
- One-Way Authentication 197
- Datagram Encapsulation 198
- PPP Dial Services Support 199
- PPP Multiline 200
- Monitoring PPP Link Quality 202
- PPP Data Compression 204
- 10-16 115391-A Rev. A 206
- Detecting Loopback Conditions 207
- PPP Interoperability 208
- Chapter 11 209
- Customizing PPP 209
- Setting Up Remote Addresses 210
- Customizing PPP Lines 211
- Editing PPP Line Parameters 212
- Setting the Restart Timer 213
- 11-6 115391-A Rev. A 214
- 11-8 115391-A Rev. A 216
- Customizing PAP 217
- 11-10 115391-A Rev. A 218
- Customizing CHAP 219
- 11-12 115391-A Rev. A 220
- 11-14 115391-A Rev. A 222
- 11-16 115391-A Rev. A 224
- Disabling Loopback Checking 225
- Deleting PPP 225
- Appendix A 227
- Parameters 227
- 228
- 229
- 229
- 230
- A-6 115391-A Rev. A 232
- A-10 115391-A Rev. A 236
- 239
- 239
- Editing WAN Line Services 240
- 241
- A-16 115391-A Rev. A 242
- A-18 115391-A Rev. A 244
- 248
- 252
- 253
- 254
- A-30 115391-A Rev. A 256
- 257
- 258
- 259
- A-34 115391-A Rev. A 260
- 262
- 264
- 266
- 266
- 267
- 271
- 273
- 275
- A-50 115391-A Rev. A 276
- 277
- 279
- 284
- 285
- 285
- 287
- A-64 115391-A Rev. A 290
- 292
- 295
- 295
- 296
- 298
- 299
- A-74 115391-A Rev. A 300
- 301
- A-76 115391-A Rev. A 302
- 303
- 303
- A-78 115391-A Rev. A 304
- 306
- Editing PPP Parameters 307
- A-84 115391-A Rev. A 310
- A-86 115391-A Rev. A 312
- 313
- A-88 115391-A Rev. A 314
- 316
- A-92 115391-A Rev. A 318
- Appendix B 323
- Asynchronous Line Parameters 324
- ATM ARE Line Parameters 324
- ATM FRE-2 Line Parameters 325
- E1 Line Parameters 326
- FDDI Line Parameters 327
- HSSI Line Parameters 328
- MCE1 Line Parameters 329
- B-8 115391-A Rev. A 330
- MCT1 Line Parameters 331
- B-10 115391-A Rev. A 332
- (continued) 333
- Multiline Parameters 334
- PPP Parameters 334
- (continued) 335
- Synchronous Line Parameters 336
- T1 Line Parameters 338
- Token Ring Line Parameters 338
- 115391-A Rev. A Index-1 339
- 115391-A Rev. A Index-3 341
- 115391-A Rev. A Index-5 343
- 115391-A Rev. A Index-7 345
- 115391-A Rev. A Index-9 347
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