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Configuring BGP Peers
308628-15.0 Rev 00
4-17
Specifying the Next-Hop Router
A BGP update message has a path attribute called NEXT_HOP that specifies the
IP address of the router to use as the next hop for the advertised destinations. By
default, the NEXT_HOP attribute can specify the IP address of a router other than
this BGP router.
Configuring the peer to advertise a next hop other than itself can eliminate extra
forwarding hops. However, you can configure the router to always send the local
BGP peer’s IP address as the next hop in all advertisements.
Using the BCC
To specify whether the BGP peer router sends its own address as the next hop in
advertisements, go to a BGP peer prompt (for example,
box; ip; /jointfilesconvert/97454/bgp;
peer/2.2.2.2/2.2.2.3
) and enter:
next-hop-self
<state>
state
is either
enabled
or
disabled
(default).
For example, the following command causes BGP to send the local peer’s IP
address as the next hop in all advertisements:
peer/2.2.2.2/2.2.2.5#
next-hop-self enabled
peer/2.2.2.2/2.2.2.5#
Using Site Manager
To specify whether the BGP peer router sends its own address as the next hop in
advertisements, complete the following steps:
Site Manager Procedure
You do this System responds
1. In the Configuration Manager window,
choose
Protocols
.
The Protocols menu opens.
2. Choose
IP
. The IP menu opens.
3. Choose
BGP
. The BGP menu opens.
4. Choose
Peers
. The IP Interface List for BGP window
opens.
(continued)
- 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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