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Configuring IP Services
8-12
117356-B Rev. 00
BGP Updates
BGP-3 and BGP-4 speakers exchange routing information in the form of routing
updates that include a network number and a list of autonomous systems that the
routing information has passed through (the AS path).
In addition, an update includes the following:
• List of path attributes
• Local preference value (BGP-4 only)
Path Attributes
A BGP-3 update message includes a variable-length sequence of path attributes.
Each attribute entry consists of an attribute value and a field describing the
attribute. Table 8-1
describes the mandatory and optional BGP-3 path attributes.
Table 8-1. BGP-3 Path Attributes
Attribute Description
AS path Mandatory attribute containing a list of the ASs that must be traversed to
reach the given destinations
Origin Mandatory attribute containing one of the following values:
• IGP (the path is valid all the way to the IGP of the originating AS)
• EGP (the path was advertised using EGP by the last AS in the AS path)
• Incomplete (the path is valid only to the last AS in the AS path)
Next hop Mandatory attribute that defines the IP address of the router to use as a
next hop for the advertised destinations
Inter-AS Optional attribute used to choose between paths to the destinations listed
Unreachable Discretionary attribute used to indicate destinations that have become
unreachable
- Configuring IP Services 1
- Trademarks 2
- Restricted Rights Legend 2
- Statement of Conditions 2
- Contents 5
- 117356-B Rev. 00 10
- About This Guide 21
- Before You Begin 22
- Conventions 22
- Bay Networks Customer Service 25
- How to Get Help 25
- Chapter 1 27
- IP Addresses 28
- Subnet Addressing 30
- Supernet Addressing 33
- Autonomous S 34
- Information Protocol (RIP) 35
- Border Gateway Protocol (BGP) 36
- Router Discovery Protocol 37
- Route Preferences 38
- Route Weights 39
- Figure 1-3. IP Routing Table 41
- IP Traffic Filters 44
- RFC Compliance 44
- Chapter 2 47
- Starting IP 48
- Starting RIP 49
- Starting OSPF 50
- Starting BGP 51
- Starting Router Discovery 52
- Chapter 3 53
- Deleting IP from an Interface 55
- Customizing IP 55
- Adding RIP to an IP Interface 57
- Customizing RIP 58
- Customizing OSPF 60
- Deleting BGP from the Router 62
- Customizing BGP 63
- Starting EGP 64
- Deleting EGP from the Router 65
- Customizing EGP 65
- Starting NAT 66
- Chapter 4 75
- The IP global prompt appears 77
- Caution: 98
- Customizing an IP Interface 99
- Customizing IP Services 101
- Using the BCC 105
- Using Site Manager 105
- Configuring an SMDS Address 120
- is one of the following: 125
- Defining an Adjacent Host 126
- Defining a Static Route 128
- Defining a Default Route 129
- Choosing a Broadcast Type 132
- Chapter 5 135
- ARP Overview 136
- Figure 5-2. Proxy ARP Example 143
- Chapter 6 147
- Customizing RIP Services 147
- Setting the RIP Diameter 148
- Customizing a RIP Interface 150
- Selecting the RIP Version 154
- Specifying the Update Mode 157
- Sending Triggered Updates 158
- Listening for a Default Route 167
- Defining a RIP Accept Policy 176
- Chapter 7 189
- Customizing OSPF Services 189
- OSPF Concepts and Terminology 190
- OSPF Neighbors 191
- Neighbor Adjacencies 192
- Designated Routers 192
- OSPF Areas 193
- OSPF Router Types 194
- AS External Routes 194
- OSPF Implementation Notes 195
- OSPF interfaces 196
- For example: 197
- Supplying an OSPF ID 199
- Figure 7-2. OSPF ASE Routes 204
- (default) 208
- Setting the Holddown Timer 209
- Configuring Message Logging 210
- Enabling and Disabling OSPF 215
- Configuring an Area ID 216
- Specifying the Network Type 217
- Estimating the Transit Delay 223
- Setting the Hello Interval 225
- Setting the Dead Interval 227
- Specifying the Metric Cost 230
- Specifying the MTU Size 233
- Defining an Area 235
- Modifying an Area ID 237
- Configuring Authentication 237
- Configuring a Summary Route 239
- Configuring a Stub Area 240
- Chapter 8 261
- Configuring BGP Services 261
- BGP Concepts and Terminology 262
- Peer-to-Peer Sessions 263
- Interior BGP Routing 264
- IBGP Route Server 265
- Figure 8-3. IBGP Route Server 266
- BGP Updates 272
- BGP Implementation Notes 275
- Configuring BGP on the Router 276
- Enabling and Disabling BGP 277
- Supplying a BGP Identifier 279
- Identifying the Local AS 280
- Enabling Multihop Connections 285
- Configuring BGP as a Soloist 288
- Negotiating the BGP Version 300
- Keeping the Connection Alive 302
- Specifying a Holddown Time 306
- Setting the Route Echo Switch 313
- Defining a BGP Accept Policy 323
- Using Site Manage 329
- OSPF/BGP Interaction 343
- Chapter 9 345
- Customizing EGP Services 345
- EGP Concepts and Terminology 346
- EGP Implementation Notes 349
- Customizing EGP on the Router 350
- Supplying a Local AS Number 351
- Configuring a Neighbor 352
- Specifying the Gateway Mode 354
- Choosing the Acquisition Mode 356
- Choosing the Poll Mode 357
- Setting Neighbor Timers 358
- Chapter 10 359
- Security Label Format 360
- Inbound IP Datagrams 362
- Forwarded IP Datagrams 362
- Originated IP Datagrams 363
- Unlabeled IP Datagrams 363
- Enabling and Disabling RIPSO 364
- Datagrams 372
- RIPSO Example 374
- Figure 10-2. RIPSO Example 375
- Chapter 11 377
- BFE Addressing 379
- (continued) 385
- Parameter Required Setting 385
- Chapter 12 387
- Dynamic Mapping 388
- 10.0.0.15 (Figure 12-2) 391
- Static Mapping 393
- Enabling and Disabling NAT 394
- Configuring the Log Mask 397
- Table 12-2. Log Message Types 398
- Customizing a NAT Interface 401
- Modifying the Interface Type 402
- Configuring Static Mapping 403
- Adding a Local Address Range 405
- Adding a Global Address Range 408
- Appendix A 411
- Site Manager Parameters 411
- BGP Global Parameters 412
- BGP-3 Global Parameters 416
- BGP-4 Global Parameters 416
- BGP Peer Parameters 417
- BGP Event Message Parameters 427
- EGP Global Parameters 428
- EGP Neighbor Parameters 429
- IP Parameters 432
- IP Interface Parameters 434
- IP Global Parameters 448
- Static Route Parameters 455
- Adjacent Host Parameters 459
- RIPSO Parameters 461
- Router Discovery Parameters 470
- OSPF Parameters 472
- OSPF Interface Parameters 478
- OSPF Area Parameters 486
- Area Range Parameters 489
- RIP Parameters 494
- NAT Parameters 501
- Appendix B 505
- Routing Policies 505
- IP Announce Policy Parameters 524
- Appendix C 557
- RIP Export Filters 561
- OSPF Import Filters 564
- OSPF Export Filters 565
- BGP-3 Import Filters 568
- BGP-3 Export Filters 573
- EGP Import Filters 577
- EGP Export Filters 579
- Appendix D 585
- Route Weight Worksheet 585
- Appendix E 589
- IP/OSPF Configuration 589
- Index-10 606
- Index-11 607
- Index-12 608
- Index-13 609
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