Avaya Configuring IP Exterior Gateway Protocols (BGP and EGP) Manuel d'utilisateur Page 31
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Exterior Gateway Protocols (BGP and EGP)
308628-15.0 Rev 00
1-9
Path Attributes
A BGP-3 update message has a variable-length sequence of path attributes. Each
attribute includes an attribute value and an attribute description. Table 1-1
lists the
mandatory and optional BGP-3 path attributes.
A BGP-4 update message has a variable-length sequence of path attributes. Each
attribute includes an attribute value and an attribute description. Table 1-2
lists the
mandatory BGP-4 path attributes.
Table 1-1. 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 specifies 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
Table 1-2. BGP-4 Mandatory Path Attributes
Attribute Description
AS path Contains a list of the ASs that must be traversed to reach the given
destinations
Origin Contains 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 an 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 Specifies the IP address of the router to use as a next hop for the
advertised destinations
- 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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