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Exterior Gateway Protocols (BGP and EGP)
308628-15.0 Rev 00
1-5
Nortel Networks supports BGP-3 and BGP-4:
• BGP-3 assumes that each advertised network is a natural class network (A, B,
or C), based on its high-order bits. BGP-3 cannot advertise subnets or
supernets.
• BGP-4 has no concept of address classes. Each network listed in the network
layer reachability information (NLRI) portion of an update message contains
a prefix length field, which describes the length of the mask associated with
the network. The prefix length field allows for both supernet and subnet
advertisement. The supernet advertisement is what makes classless
interdomain routing (CIDR) possible. See “Classless Interdomain Routing”
on page 1-4.
In addition, BGP-4 supports BGP confederations and TCP MD5 message
authentication.
This section covers the following topics:
Peer-to-Peer Sessions
A BGP router employs a BGP speaker, which is an entity within the router that
transmits and receives BGP messages and acts upon them. A BGP speaker forms
a neighbor relationship with another BGP speaker by establishing a peer-to-peer
session. See Chapter 4, “
Configuring BGP Peers.”
Topic Page
Peer-to-Peer Sessions 1-5
Stub and Multihomed Autonomous Systems 1-6
Interior BGP Routing 1-6
IBGP Route Reflector 1-7
Equal-Cost Multipath 1-8
BGP Updates 1-8
Path Attributes 1-9
BGP/OSPF Interaction 1-10
BGP-4 Confederations 1-11
BGP-4 TCP MD5 Message Authentication 1-11
- 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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