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Configuring IP Services
7-34 117356-A Rev. A
Using Point-to-Multipoint Interfaces in a Star Topology
OSPF point-to-multipoint interfaces provide an efficient means to connect routers
in a star topology. The routers are configured as follows:
• The hub of the star topology -- the BCN® router in Figure 7-
4 -- is configured
with a point-to-multipoint interface to the PVC and is set to be the OSPF
designated router in the network. The Router Priority parameter is set to a
value greater than 0.
• Each spoke of the star -- the AN® routers in Figure 7-
4 -- is configured with a
point-to-multipoint interface to the PVC and is made ineligible to become the
designated router. The Router Priority parameter on each AN is set to 0.
When the spokes of the topology (the AN routers) are computing routes through
the other spokes, the next hop is forced to be the hub (the BCN router). The hub
can then forward the packet to the correct spoke.
Running OSPF with point-to-multipoint network interfaces addresses two
problems: how to minimize the number of subnets and how to minimize the
number of interfaces required to support communications within the star topology.
With point-to-multipoint interfaces, each star topology requires only one subnet,
rather than one subnet for each PVC. Also, the hub needs to support only one
interface for each star rather than one interface for each PVC, reducing the
demand for resources on the router.
- Configuring IP 1
- Services 1
- Contents 5
- 117356-A Rev. A 10
- About This Guide 21
- Before You Begin 22
- Conventions 22
- Acronyms 23
- Bay Networks Customer Service 25
- How to Get Help 25
- Chapter 1 27
- IP Addresses 28
- 117356-A Rev. A 1-3 29
- Subnet Addressing 30
- 117356-A Rev. A 1-5 31
- 1-6 117356-A Rev. A 32
- Supernet Addressing 33
- Autonomous Systems 34
- Border Gateway Protocol (BGP) 36
- Router Discovery Protocol 37
- Route Preferences 38
- Route Weights 39
- 1-14 117356-A Rev. A 40
- Figure 1-3. IP Routing Table 41
- 1-16 117356-A Rev. A 42
- 117356-A Rev. A 1-17 43
- IP Traffic Filters 44
- RFC Compliance 44
- Chapter 2 47
- Starting IP 48
- 117356-A Rev. A 2-3 49
- Starting RIP 50
- Starting OSPF 51
- Starting BGP 52
- 117356-A Rev. A 2-7 53
- Chapter 3 55
- Deleting IP from an Interface 57
- Customizing IP 57
- Adding RIP to an IP Interface 59
- Customizing RIP 60
- Customizing OSPF 62
- Deleting BGP from the Router 64
- Customizing BGP 65
- Starting EGP 66
- Deleting EGP from the Router 67
- Customizing EGP 67
- Starting NAT 68
- 3-16 117356-A Rev. A 70
- 3-18 117356-A Rev. A 72
- 117356-A Rev. A 3-19 73
- 3-20 117356-A Rev. A 74
- Chapter 4 77
- 4-2 117356-A Rev. A 78
- The IP global prompt appears 79
- 4-4 117356-A Rev. A 80
- 4-8 117356-A Rev. A 84
- Bay Supported 85
- 4-10 117356-A Rev. A 86
- 4-22 117356-A Rev. A 98
- Customizing an IP Interface 100
- Customizing IP Services 101
- Configuring IP Services 102
- 4-26 117356-A Rev. A 102
- 4-28 117356-A Rev. A 104
- Using Site Manager 106
- Using the BCC 106
- Configuring SMDS 121
- 4-46 117356-A Rev. A 122
- Configuring an SMDS Address 125
- Defining an Adjacent Host 132
- Defining a Static Route 134
- Defining a Default Route 135
- 4-60 117356-A Rev. A 136
- Choosing a Broadcast Type 138
- 4-64 117356-A Rev. A 140
- Chapter 5 141
- Configuring Address Resolution 141
- ARP Overview 142
- 117356-A Rev. A 5-3 143
- 5-6 117356-A Rev. A 146
- Figure 5-2. Proxy ARP Example 149
- Chapter 6 155
- Customizing RIP Services 155
- Setting the RIP Diameter 157
- Customizing a RIP Interface 158
- 6-6 117356-A Rev. A 160
- Selecting the RIP Version 162
- Specifying the Update Mode 165
- Sending Triggered Updates 167
- Listening for a Default Route 177
- 6-24 117356-A Rev. A 178
- Configuring RIP Policies 186
- Chapter 7 191
- Customizing OSPF Services 191
- OSPF Concepts and Terminology 192
- OSPF Neighbors 193
- Neighbor Adjacencies 194
- Designated Routers 194
- OSPF Areas 195
- OSPF Router Types 196
- AS External Routes 196
- OSPF Implementation Notes 197
- OSPF interfaces 198
- For example: 199
- 7-10 117356-A Rev. A 200
- Supplying an OSPF ID 202
- 7-18 117356-A Rev. A 208
- Figure 7-2. OSPF ASE Routes 208
- 7-20 117356-A Rev. A 210
- (default) 212
- Setting the Holddown Timer 213
- Configuring Message Logging 214
- 7-28 117356-A Rev. A 218
- Enabling and Disabling OSPF 220
- Configuring an Area ID 221
- Specifying the Network Type 222
- 7-34 117356-A Rev. A 224
- Estimating the Transit Delay 228
- Setting the Hello Interval 231
- Setting the Dead Interval 233
- Specifying the Metric Cost 236
- Specifying the MTU Size 239
- Defining an Area 242
- Supplying an ID for the Area 243
- Modifying an Area ID 245
- Configuring Authentication 246
- Configuring a Summary Route 248
- Configuring a Stub Area 250
- 7-62 117356-A Rev. A 252
- 7-64 117356-A Rev. A 254
- 7-66 117356-A Rev. A 256
- 7-70 117356-A Rev. A 260
- Chapter 8 261
- Configuring BGP Services 261
- BGP Concepts and Terminology 262
- Configuring BGP Services 263
- IBGP in a Transit AS 264
- BGP Path Attributes 265
- 8-6 117356-A Rev. A 266
- BGP-4 Local Preference Values 267
- BGP Implementation Notes 268
- Configuring BGP on the Router 269
- Enabling and Disabling BGP 270
- Supplying a BGP Identifier 272
- Identifying the Local AS 273
- Setting the Interval Timer 276
- Enabling Multihop Connections 279
- Configuring BGP as a Soloist 281
- 8-26 117356-A Rev. A 286
- Negotiating the BGP Version 288
- Keeping the Connection Alive 290
- Specifying a Holddown Time 294
- Setting the Route Echo Switch 301
- 8-44 117356-A Rev. A 304
- 117356-A Rev. A 8-45 305
- 8-46 117356-A Rev. A 306
- Configuring Routing Policies 308
- 8-52 117356-A Rev. A 312
- OSPF/BGP Interaction 314
- Chapter 9 317
- Customizing EGP Services 317
- EGP Concepts and Terminology 318
- 9-4 117356-A Rev. A 320
- EGP Implementation Notes 321
- Customizing EGP on the Router 322
- Supplying a Local AS Number 323
- Configuring a Neighbor 324
- Specifying the Gateway Mode 326
- Choosing the Acquisition Mode 328
- Choosing the Poll Mode 329
- Setting Neighbor Timers 330
- Chapter 10 331
- 10-2 117356-A Rev. A 332
- Security Label Format 333
- 10-4 117356-A Rev. A 334
- Inbound IP Datagrams 335
- Forwarded IP Datagrams 335
- Originated IP Datagrams 336
- Unlabeled IP Datagrams 336
- Enabling and Disabling RIPSO 337
- 10-8 117356-A Rev. A 338
- 10-10 117356-A Rev. A 340
- 10-12 117356-A Rev. A 342
- 10-14 117356-A Rev. A 344
- Outbound Datagrams 345
- Error Datagrams 346
- RIPSO Example 347
- 10-18 117356-A Rev. A 348
- Figure 10-2. RIPSO Example 348
- Chapter 11 349
- 11-2 117356-A Rev. A 350
- BFE Addressing 351
- 117356-A Rev. A 11-5 353
- 11-6 117356-A Rev. A 354
- (continued) 355
- 11-8 117356-A Rev. A 356
- 117356-A Rev. A 11-9 357
- Chapter 12 359
- Overview 360
- 117356-A Rev. A 12-3 361
- 12-4 117356-A Rev. A 362
- 12-6 117356-A Rev. A 364
- Static Mapping 365
- 12-8 117356-A Rev. A 366
- Enabling and Disabling NAT 367
- 12-10 117356-A Rev. A 368
- Configuring the Log Mask 370
- Table 12-2. Log Message Types 371
- 12-14 117356-A Rev. A 372
- Customizing a NAT Interface 374
- Modifying the Interface Type 375
- Configuring Static Mapping 376
- Adding a Local Address Range 378
- 12-22 117356-A Rev. A 380
- Adding a Global Address Range 381
- 12-24 117356-A Rev. A 382
- Appendix A 385
- Site Manager Parameters 385
- 386
- 389
- A-8 117356-A Rev. A 392
- A-10 117356-A Rev. A 394
- A-12 117356-A Rev. A 396
- A-14 117356-A Rev. A 398
- A-16 117356-A Rev. A 400
- EGP Parameters 401
- 402
- 403
- 403
- A-20 117356-A Rev. A 404
- IP Parameters 405
- A-22 117356-A Rev. A 406
- A-24 117356-A Rev. A 408
- 410
- A-28 117356-A Rev. A 412
- A-30 117356-A Rev. A 414
- A-32 117356-A Rev. A 416
- 419
- A-36 117356-A Rev. A 420
- 421
- 422
- 423
- A-46 117356-A Rev. A 430
- 434
- A-52 117356-A Rev. A 436
- A-54 117356-A Rev. A 438
- 443
- A-60 117356-A Rev. A 444
- OSPF Parameters 445
- A-62 117356-A Rev. A 446
- A-64 117356-A Rev. A 448
- 449
- 450
- 450
- 452
- A-70 117356-A Rev. A 454
- A-72 117356-A Rev. A 456
- 457
- 457
- 460
- Area Range Parameters 462
- 463
- A-82 117356-A Rev. A 466
- RIP Parameters 467
- 468
- 469
- A-86 117356-A Rev. A 470
- 473
- NAT Parameters 474
- 476
- Appendix B 479
- Routing Policies 479
- B-2 117356-A Rev. A 480
- 482
- B-6 117356-A Rev. A 484
- 486
- B-10 117356-A Rev. A 488
- B-12 117356-A Rev. A 490
- B-14 117356-A Rev. A 492
- B-16 117356-A Rev. A 494
- if the Action 496
- IP Announce Policy Parameters 498
- B-22 117356-A Rev. A 500
- B-24 117356-A Rev. A 502
- B-26 117356-A Rev. A 504
- B-28 117356-A Rev. A 506
- B-30 117356-A Rev. A 508
- B-32 117356-A Rev. A 510
- B-34 117356-A Rev. A 512
- B-36 117356-A Rev. A 514
- B-38 117356-A Rev. A 516
- 517
- B-42 117356-A Rev. A 520
- 522
- 523
- B-46 117356-A Rev. A 524
- B-50 117356-A Rev. A 528
- 529
- B-52 117356-A Rev. A 530
- Appendix C 531
- C-2 117356-A Rev. A 532
- 533
- RIP Export Filters 535
- C-6 117356-A Rev. A 536
- 537
- OSPF Import Filters 538
- OSPF Export Filters 539
- C-10 117356-A Rev. A 540
- BGP-3 Import Filters 542
- 117356-A Rev. A C-13 543
- C-16 117356-A Rev. A 546
- BGP-3 Export Filters 547
- C-18 117356-A Rev. A 548
- EGP Import Filters 551
- EGP Export Filters 553
- C-24 117356-A Rev. A 554
- 555
- 117356-A Rev. A C-27 557
- Appendix D 559
- Route Weight Worksheet 559
- D-2 117356-A Rev. A 560
- D-4 117356-A Rev. A 562
- Appendix E 563
- IP/OSPF Configuration 563
- E-2 117356-A Rev. A 564
- IP/OSPF Configuration 565
- E-4 117356-A Rev. A 566
- E-6 117356-A Rev. A 568
- 117356-A Rev. A Index-1 571
- 117356-A Rev. A Index-3 573
- 117356-A Rev. A Index-5 575
- 117356-A Rev. A Index-7 577
- 117356-A Rev. A Index-9 579
- 117356-A Rev. A Index-11 581
- 117356-A Rev. A Index-13 583
- 117356-A Rev. A Index-15 585
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