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Exterior Gateway Protocols (BGP and EGP)
308628-15.0 Rev 00
1-3
Border Gateway Protocol (BGP)
The Border Gateway Protocol (BGP) is an exterior gateway protocol used by
border routers to exchange network reachability information with other BGP
systems. BGP routers form peer relationships with other BGP routers in other
autonomous systems or within the same autonomous system. BGP peers transmit
and receive current routing information over a reliable transport layer connection,
making periodic updates unnecessary. BGP is designed for inter-AS exchanges,
but can be used between multiple routing domains (for example, RIP to OSPF).
BGP peers exchange complete routing information only after the peer connection
is established. Thereafter, BGP peers exchange routing updates. An update
includes a network number, a list of autonomous systems that the routing
information passed through (the AS path), and other path attributes that describe
the route to a set of destination networks. When multiple paths are available, BGP
compares the path attributes to choose the preferred path.
BGP exchanges information between ASs as well as between routers in the same
AS. To differentiate between these uses, the latter is called interior BGP (IBGP).
Exterior Gateway Protocol (EGP)
You use the Exterior Gateway Protocol to exchange network reachability
information between routers in different autonomous systems. An interior
gateway protocol (IGP), such as RIP or OSPF, is used within an AS to facilitate
the communication of routing information within an autonomous system. The
routers that serve as the end points of a connection between two autonomous
systems also run an exterior gateway protocol, such as EGP-2.
Routers establish EGP neighbor relationships to periodically exchange reliable
network reachability information. EGP neighbors exchange complete reachability
information, not just updates. The router uses this information to maintain a list of
gateways, the networks the gateways can reach, and the corresponding distances.
Chapter 8, “
Customizing EGP Services,” describes the use of EGP.
- Configuring IP Exterior 1
- Gateway Protocols 1
- (BGP and EGP) 1
- Trademarks 2
- Restricted Rights Legend 2
- Statement of Conditions 2
- Contents 5
- 308628-15.0 Rev 00 6
- Before You Begin 15
- Text Conventions 16
- Set Trap Monitor Filters 17
- Acronyms 18
- Related Publications 20
- How to Get Help 21
- Chapter 1 23
- Border Gateway Protocol (BGP) 25
- BGP Concepts and Terminology 26
- Peer-to-Peer Sessions 27
- Interior BGP Routing 28
- IBGP Route Reflector 29
- Equal-Cost Multipath 30
- BGP Updates 30
- Path Attributes 31
- BGP/OSPF Interaction 32
- BGP-4 Confederations 33
- BGP Implementation Notes 34
- Chapter 2 37
- Starting BGP and EGP Services 37
- Deleting EGP from the Router 43
- Chapter 3 45
- Disabling and Reenabling BGP 46
- Supplying a BGP Router ID 48
- Identifying the Local AS 49
- Enabling Multihop Connections 57
- Figure 3-1. BGP Confederation 67
- Selection 69
- Best-Route Selection 71
- Chapter 4 83
- Negotiating the BGP Version 88
- Keeping the Connection Alive 90
- Specifying a Holddown Time 93
- 2.2.2.5: 95
- Setting the Route Echo Switch 100
- Configuring BGP Peers 103
- 308628-15.0 Rev 00 104
- Using Site Manager 109
- Chapter 5 111
- Topic Page 112
- Examples 118
- Announce Policy Guidelines 123
- Chapter 6 139
- Configuring a Route Reflector 139
- Configuring an RR Client 148
- Chapter 7 151
- Chapter 8 161
- Customizing EGP Services 161
- EGP Concepts and Terminology 162
- EGP Implementation Notes 165
- Customizing EGP on the Router 166
- Configuring a Neighbor 167
- Specifying the Gateway Mode 169
- Choosing the Acquisition Mode 171
- Choosing the Poll Mode 172
- Setting Neighbor Timers 173
- Appendix A 175
- Site Manager Parameters 175
- BGP Parameters 176
- BGP Configuration Parameters 177
- BGP Global Parameters 178
- BGP-3 Global Parameter 185
- BGP-4 Global Parameter 185
- BGP Peer Parameters 185
- BGP Event Message Parameters 198
- EGP Parameters 199
- EGP Neighbor Parameters 200
- Routing Policy Parameters 203
- Appendix B 257
- Regular Expression Symbols 268
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