Avaya Configuring IP Exterior Gateway Protocols (BGP and EGP) Manuale Utente Pagina 153
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308628-14.00 Rev 00
9-1
Chapter 9
Configuring Route and Traffic-Load Balancing
IBGP route balancing and traffic-load balancing are two techniques that allow an
IBGP speaker to distribute routes to the same destination among multiple
equal-cost paths. This chapter describes how to configure route and traffic-load
balancing.
In both techniques, IBGP uses equal-cost multipath (ECMP) routes submitted to
the IP routing table by the IGP (OSPF or RIP) in the AS. The ECMP routes could
also be static routes. For information about ECMP routing, see Chapter 4,
“Configuring and Customizing IP for BGP.”
Configuring IBGP for Route and Traffic-Load Balancing
To configure an IBGP speaker for route balancing and traffic-load balancing, the
IGP used in the AS (OSPF, for example) must be configured for ECMP on all
routers.
Figure 9-1
, for example, shows an AS containing six IP routers. The routers with
interfaces to internal links are running OSPF. The routers with interfaces to both
internal and external links are running OSPF and BGP.
- 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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