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Configuring and Customizing BGP
303528-A Rev 00
8-75
Best-Route Calculation for Equal Routes
BGP uses the following rules (tie breakers) to choose between two equal BGP
routes:
• Choose the route with the lower route weight.
• Choose the route with the higher local preference attribute.
• Choose the route with the lower inter-AS metric attribute (if both routes
include this optional attribute).
• Choose the route with the lower interior cost to the next hop.
• Choose external BGP over IBGP.
• Choose the route with the lower BGP identifier.
• Choose the route with the lower BGP connection remote address.
• Choose the route with the lower BGP connection local address.
OSPF/BGP Interaction
RFC 1403 defines the interaction between BGP and OSPF when OSPF is the IGP
within an autonomous system. For routers running both protocols, the OSPF
router ID and the BGP identifier must be an IP address and must be identical. A
route policy must be configured to allow BGP advertisement of OSPF routes.
Interaction between BGP-4 and OSPF includes the ability to advertise supernets
to support classless interdomain routing (CIDR). BGP-4 allows interdomain
supernet advertisements; OSPF can carry supernet advertisements within a routing
domain.
- Configuring IP Services 1
- Trademarks 2
- Restricted Rights Legend 2
- Statement of Conditions 2
- Contents 5
- 303528-A Rev 00 10
- Before You Begin 23
- Text Conventions 24
- Acronyms 25
- How to Get Help 27
- Chapter 1 29
- IP Addresses 30
- Subnet Addressing 32
- Supernet Addressing 35
- Autonomous Systems 36
- Border Gateway Protocol (BGP) 38
- Router Discovery Protocol 39
- Route Preferences 40
- Route Weights 41
- Figure 1-3. IP Routing Table 43
- IP Traffic Filters 46
- RFC Compliance 46
- Chapter 2 49
- Starting IP 50
- Starting RIP 51
- Starting OSPF 52
- Starting BGP 53
- Starting Router Discovery 54
- 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
- Chapter 4 77
- The IP global prompt appears 79
- (continued) 85
- Caution: 100
- Customizing an IP Interface 102
- Using the BCC 108
- Using Site Manager 108
- IP0012A 121
- Configuring an SMDS Address 123
- Defining a Static Route 132
- Choosing a Broadcast Type 138
- Chapter 5 141
- ARP Overview 142
- Figure 5-2. Proxy ARP Example 149
- Chapter 6 153
- Customizing RIP Services 153
- Setting the RIP Diameter 154
- Customizing a RIP Interface 156
- Selecting the RIP Version 160
- Specifying the Update Mode 163
- Sending Triggered Updates 164
- Listening for a Default Route 173
- Chapter 7 195
- Customizing OSPF Services 195
- OSPF Concepts and Terminology 196
- OSPF Neighbors 197
- Neighbor Adjacencies 198
- Designated Routers 198
- OSPF Areas 199
- OSPF Router Types 200
- AS External Routes 200
- OSPF Implementation Notes 201
- OSPF interfaces 202
- For example: 203
- Supplying an OSPF ID 205
- Figure 7-2. OSPF ASE Routes 210
- (default) 214
- Setting the Holddown Timer 215
- Configuring Message Logging 216
- Enabling and Disabling OSPF 222
- Configuring an Area ID 223
- Specifying the Network Type 224
- Estimating the Transit Delay 229
- Setting the Hello Interval 231
- Setting the Dead Interval 233
- Specifying the Metric Cost 236
- Specifying the MTU Size 239
- Defining an Area 242
- Modifying an Area ID 244
- Configuring Authentication 244
- Configuring a Summary Route 246
- Configuring a Stub Area 247
- Chapter 8 269
- BGP Concepts and Terminology 270
- Peer-to-Peer Sessions 271
- Interior BGP Routing 272
- IBGP Route Reflector 273
- BGP Updates 274
- BGP Implementation Notes 277
- Configuring BGP Globally 278
- Enabling and Disabling BGP 279
- Supplying a BGP Identifier 281
- Identifying the Local AS 282
- Enabling Multihop Connections 288
- Configuring BGP as a Soloist 291
- Negotiating the BGP Version 301
- Keeping the Connection Alive 303
- Specifying a Holddown Time 307
- Setting the Route Echo Switch 314
- Using Site Manage 330
- (continued) 333
- OSPF/BGP Interaction 343
- Chapter 9 361
- Customizing EGP Services 361
- EGP Concepts and Terminology 362
- EGP Implementation Notes 365
- Customizing EGP on the Router 366
- Supplying a Local AS Number 367
- Configuring a Neighbor 368
- Specifying the Gateway Mode 370
- Choosing the Acquisition Mode 372
- Choosing the Poll Mode 373
- Setting Neighbor Timers 374
- Chapter 10 375
- Security Label Format 376
- Inbound IP Datagrams 378
- Forwarded IP Datagrams 378
- Unlabeled IP Datagrams 379
- Originated IP Datagrams 379
- Enabling and Disabling RIPSO 380
- Outbound Datagrams 388
- Error Datagrams 389
- RIPSO Example 390
- Figure 10-2. RIPSO Example 391
- Chapter 11 393
- BFE Addressing 395
- Chapter 12 403
- Dynamic Address Translation 404
- Static Address Translation 409
- Enabling and Disabling NAT 411
- Configuring the Log Mask 413
- Table 12-2. Log Message Types 414
- Customizing a NAT Interface 417
- Modifying the Interface Type 418
- Adding a Local Address Range 421
- Adding a Global Address Range 424
- IP0076A 429
- Chapter 13 431
- How GRE Tunneling Works 432
- Figure 13-1. GRE Tunneling 433
- Announce Policy 434
- Accept Policy 435
- Static Routes 435
- Deleting a GRE Tunnel 441
- Appendix A 443
- Site Manager Parameters 443
- BGP Global Parameters 444
- BGP-3 Global Parameters 449
- BGP-4 Global Parameters 449
- BGP Peer Parameters 449
- BGP Event Message Parameters 459
- EGP Global Parameters 460
- EGP Neighbor Parameters 462
- IP Parameters 465
- IP Interface Parameters 467
- IP Global Parameters 481
- Static Route Parameters 489
- Adjacent Host Parameters 492
- RIPSO Parameters 495
- Router Discovery Parameters 505
- OSPF Parameters 507
- OSPF Interface Parameters 513
- OSPF Area Parameters 522
- Area Range Parameters 525
- RIP Parameters 530
- NAT Parameters 537
- Appendix B 545
- Routing Policies 545
- IP Announce Policy Parameters 564
- Appendix C 597
- RIP Export Filters 601
- OSPF Import Filters 604
- OSPF Export Filters 605
- BGP-3 Import Filters 608
- 610
- BGP-3 Export Filters 613
- EGP Import Filters 617
- EGP Export Filters 619
- 621
- Appendix D 625
- Route Weight Worksheet 625
- Appendix E 629
- IP/OSPF Configuration 629
- 128.10.6.0 630
- 255.255.255.248 630
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