Avaya Configuring IP Exterior Gateway Protocols (BGP and EGP) Manual de usuario Pagina 27
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Exterior Gateway Protocols (BGP/EGP)
308628-14.00 Rev 00
1-7
Figure 1-3. Transit AS
In Figure 1-3, AS 20 is the transit AS. It provides information about its internal
networks, as well as transit networks, to the remaining ASs. The IBGP
connections between BGP routers A, B, and C are necessary to provide consistent
information to the ASs.
IBGP Route Reflector
A BGP router configured for IBGP must establish a peer-to-peer session with
every other IBGP speaker in the AS. In an AS with a large number of IBGP
speakers, this full-mesh topology can result in high bandwidth and maintenance
costs. For example, a full-mesh topology for an AS with 50 IBGP speakers
requires 1225 internal peer-to-peer connections.
AS 20
AS 10
AS 50
AS 11
AS 12
AS 30
IGP
BGP A
BGP B
BGP C
IP0021A
- Configuring IP Exterior 1
- Gateway Protocols (BGP and 1
- Trademarks 2
- Statement of Conditions 2
- Contents 5
- 308628-14.00 Rev 00 10
- 308628-14.00 Rev 00 11
- Before You Begin 15
- Text Conventions 16
- Set Trap Monitor Filters 17
- Acronyms 18
- Hard-Copy Technical Manuals 19
- How to Get Help 20
- Chapter 1 21
- Border Gateway Protocol (BGP) 23
- BGP Concepts and Terminology 24
- Peer-to-Peer Sessions 25
- Interior BGP Routing 26
- IBGP Route Reflector 27
- Equal-Cost Multipath 28
- BGP Updates 28
- Path Attributes 29
- BGP/OSPF Interaction 30
- BGP-4 Confederations 30
- BGP Implementation Notes 31
- Chapter 2 33
- <mask> 34
- Starting BGP 35
- Chapter 3 37
- Deleting BGP from the Router 39
- Starting EGP 40
- Deleting EGP from the Router 42
- Customizing EGP 42
- Next-hop address 0 44
- Next-hop mask 0 44
- Chapter 4 45
- The IP global prompt appears 46
- Defining a Static Route 53
- Chapter 5 59
- Enabling and Disabling BGP 60
- Supplying a BGP Identifier 62
- Identifying the Local AS 63
- Enabling Multihop Connections 69
- Configuring BGP as a Soloist 72
- Best-Route Selection 86
- <name> 91
- Chapter 6 95
- Negotiating the BGP Version 100
- Keeping the Connection Alive 101
- Using the BCC 102
- Using Site Manager 102
- Specifying a Holddown Time 104
- Setting the Route Echo Switch 110
- Chapter 7 117
- Defining a BGP Accept Policy 118
- Using Site Manage 126
- (continued) 129
- (continued) 131
- Chapter 8 141
- Configuring a Route Reflector 141
- Configuring an RR Client 149
- 2.2.2.3): 150
- Chapter 9 153
- Chapter 10 163
- Customizing EGP Services 163
- EGP Concepts and Terminology 164
- EGP Implementation Notes 167
- Customizing EGP on the Router 168
- Supplying a Local AS Number 169
- Configuring a Neighbor 170
- Specifying the Gateway Mode 172
- Choosing the Acquisition Mode 174
- Choosing the Poll Mode 175
- Setting Neighbor Timers 176
- Appendix A 177
- Site Manager Parameters 177
- BGP Configuration Parameters 178
- BGP Global Parameters 178
- BGP-3 Global Parameter 186
- BGP-4 Global Parameter 186
- BGP Peer Parameters 186
- BGP Event Message Parameters 198
- EGP Parameters 200
- EGP Neighbor Parameters 201
- IP Parameters 204
- IP Interface Parameters 206
- IP Global Parameters 220
- Static Route Parameters 227
- Adjacent Host Parameters 230
- Appendix B 235
- Routing Policies 235
- Appendix C 289
- Commands 296
- Regular Expression Symbols 300
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