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Configuring IP Services
5-2
BGP Features
BGP is an exterior gateway protocol primarily used to exchange network
reachability information with other BGP systems in other autonomous systems.
BGP exchanges routing information in the form of routing updates. An update
includes a network number, a list of autonomous systems that the routing
information has passed through (the AS path), and a list of other path attributes.
Figure 5-1 shows two autonomous systems: AS1 and AS2. Networks within AS1
and AS2 are connected by routers running an interior gateway protocol — in this
case, OSPF. AS1 and AS2 are connected by routers that run an exterior gateway
protocol — BGP — in addition to OSPF.
Figure 5-1. BGP Connecting Autonomous Systems Running OSPF
A BGP router employs a BGP speaker, which is an entity within the router that
transmits and receives BGP messages and acts upon them. BGP routers form
neighbor relationships with other BGP routers. BGP runs over the LAN and WAN
media/protocols that IP runs over — Ethernet, Token Ring, Sync, Wellfleet
Proprietary Sync, Frame Relay, SMDS, X25 (DDN, PDN, Pt-to-Pt), ATM PVC,
FDDI, T1, E1, HSSI, and PPP.
An autonomous system can include one or more BGP speakers that provide
external route information for the networks within the AS. An AS containing a
single BGP speaker with a single external BGP connection is a stub AS. The BGP
speaker is providing external route information for the networks contained within
its AS only.
OSPF
OSPF/BGP
OSPF
OSPF
OSPF/BGP
OSPF
BGP
Connection
AS1
AS2
OSPF
OSPF
- Configuring IP Services 1
- Bay Networks Software License 3
- About This Guide 5
- Software Suites 6
- Audience 7
- CompuServe 8
- InfoFACTS 8
- How to Get Help 9
- Conventions 10
- Acronyms 11
- Chapter 1 13
- IP Datagrams 14
- IP Addresses 15
- Subnet Addressing 16
- (continued) 19
- Border Gateway Protocol (BGP) 22
- Route Preferences 23
- Route Weights 24
- IP Traffic Filters 27
- RFC Compliance 27
- Chapter 2 29
- Configuring IP Interfaces 30
- Multinet Interfaces 31
- Next-hop address 0 33
- Next-hop mask equals 0 33
- Subnet Broadcast Addresses 35
- Proxy ARP 38
- Inverse ARP 39
- HP Probe 39
- Security Label Format 45
- How RIPSO Works on the Router 46
- Inbound IP Datagrams 47
- Forwarded IP Datagrams 48
- Originated IP Datagrams 48
- Unlabeled IP Datagrams 48
- RIPSO Example 49
- Defining a Static Route 50
- BFE Addressing 53
- IP over ATM 57
- Configuring Host-Only Mode 58
- Editing IP Parameters 59
- Editing IP Global Parameters 80
- finished 81
- Deleting IP from an Interface 89
- Configuring Static Routes 91
- Editing a Static Route 92
- Deleting a Static Route 96
- Adding an Adjacent Host 97
- Configuring IP Services 100
- Editing TFTP Parameters 101
- Configuring RIPSO Support 104
- Configuring Router Discovery 114
- (continued) 119
- Settings 121
- Chapter 3 123
- Configuring RIP Services 123
- Sending RIP Updates 124
- Sending Triggered Updates 125
- Receiving RIP Updates 126
- Configuring RIP Services 127
- Setting RIP Timers 128
- Enabling RIP2 Authentication 128
- Specifying the RIP Diameter 129
- Editing RIP Parameters 129
- Configuring RIP on the Router 130
- RIP Parameter Descriptions 131
- Chapter 4 139
- Configuring OSPF Services 139
- Specifying Network Types 141
- Configuring OSPF Services 143
- Establishing Adjacencies 144
- Dividing an AS into Areas 145
- Configuring a Border Router 148
- Configuring a Boundary Router 152
- Figure 4-6. OSPF ASE Routes 154
- Configuring Cost Metrics 156
- Table 4-1. OSPF Area Routers 159
- OSPF Implementation Notes 160
- Editing OSPF Parameters 161
- Configuring OSPF on the Router 162
- Editing an OSPF Interface 165
- Example: 178
- Editing OSPF Area Parameters 182
- Adding an Area 183
- Editing an Area 184
- Deleting an Area 186
- Adding a Range to an Area 187
- Editing an Area’s Range 190
- Deleting a Range from an Area 192
- Editing a Neighbor 195
- Deleting a Neighbor 196
- Adding a Virtual Interface 198
- Editing a Virtual Interface 199
- Deleting a Virtual Interface 203
- Chapter 5 205
- Configuring BGP Services 205
- BGP Features 206
- Configuring BGP Services 207
- Configuring BGP on the Router 208
- Selecting the BGP Version 208
- Initiating a Connection 210
- Negotiating a Connection 211
- Keeping the Connection Alive 212
- Terminating a Connection 212
- BGP Messages 213
- Keepalive Message 214
- Update Message 214
- BGP-3 Update Message Format 215
- BGP-4 Update Message Format 216
- . (dot or period) 218
- Notification Message 219
- How BGP Selects the Best Path 221
- Routing Policies 222
- OSPF/BGP Interaction 224
- Using IBGP in a Transit AS 225
- BGP Implementation Notes 227
- Editing BGP Parameters 228
- Editing BGP Global Parameters 232
- Adding a BGP Peer 242
- Deleting a BGP Peer 251
- Generating BGP Event Messages 256
- Click on Add 257
- Deleting BGP from the Router 259
- 2. Click on OK 260
- Chapter 6 261
- Configuring EGP Services 261
- Running RIP 262
- Neighbor Acquisition Phase 263
- Configuring EGP Services 265
- Neighbor Reachability Phase 266
- Router A 268
- Router B 268
- Network Reachability Phase 269
- EGP Implementation Notes 271
- Editing EGP Parameters 272
- Configuring EGP on the Router 273
- Configuring EGP Neighbors 275
- 3. Click on EGP Neighbor 276
- Adding an EGP Neighbor 277
- Editing an EGP Neighbor 279
- Deleting an EGP Neighbor 281
- Deleting EGP from the Router 282
- Chapter 7 283
- Configuring IP Multicasting 283
- Host Groups 284
- How IGMP Works 285
- Configuring IP Multicasting 287
- Figure 7-1. Multicast Routers 287
- Advertising a Route 289
- Creating a Shortest-Path Tree 289
- Identifying a Leaf Network 290
- Pruning a Shortest-Path Tree 290
- Aging a Route 291
- Specifying a Threshold 291
- Types of Multicast Support 293
- Adding a DVMRP Tunnel 308
- 3. Click on Save 312
- Chapter 8 317
- Configuring NetBIOS over IP 317
- Overview of NetBIOS Services 318
- Configuring NetBIOS over IP 319
- Aging a Cache Entry 323
- Customizing a Cache Search 323
- Editing NetBIOS Parameters 325
- NetBIOS Global Parameters 327
- Chapter 9 339
- Configuring IP Policies 339
- Figure 9-1. IP Routing Table 340
- Configuring IP Policies 341
- Configuring Accept Policies 343
- Configuring Announce Policies 359
- Chapter 10 385
- 2. Click on Edit 394
- OSPF Route Filters 395
- 3. Click on OK 401
- BGP-3 Route Filters 405
- EGP Route Filters 418
- Appendix A 429
- Site Manager Default Settings 429
- Table A-5. IP Static Routes 432
- Table A-6. TFTP Parameters 432
- Table A-8. RIPSO Parameters 433
- NetBIOS over IP 435
- BGP Parameters 436
- EGP Parameters 438
- OSPF Parameters 439
- Appendix B 443
- Route Weight Worksheet 443
- Appendix C 447
- IP/OSPF Configuration 447
- IP/OSPF Configuration 449
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