Administrator Guide

The following illustration shows the configurations described on the following examples. These configurations show how to create BGP
areas using physical and virtual links. They include setting up the interfaces and peers groups with each other.
Figure 24. BGP peer group example configurations
Example of Enabling BGP (Router 1)
R1# conf
R1(conf)#int loop 0
R1(conf-if-lo-0)#ip address 192.168.128.1/32
R1(conf-if-lo-0)#no shutdown
R1(conf-if-lo-0)#show config
!
interface Loopback 0
ip address 192.168.128.1/24
no shutdown
R1(conf-if-lo-0)#int gi 1/21
R1(conf-if-gi-1/21)#ip address 10.0.1.21/24
R1(conf-if-gi-1/21)#no shutdown
R1(conf-if-gi-1/21)#show config
!
interface GigabitEthernet 1/21
ip address 10.0.1.21/24
no shutdown
R1(conf-if-gi-1/21)#int gi 1/31
R1(conf-if-gi-1/31)#ip address 10.0.3.31/24
R1(conf-if-gi-1/31)#no shutdown
R1(conf-if-gi-1/31)#show config
!
interface GigabitEthernet 1/31
ip address 10.0.3.31/24
no shutdown
R1(conf-if-gi-1/31)#exit
R1(conf)#ip route 192.168.128.2/32 10.0.1.22
R1(conf)#router bgp 99
R1(conf-router_bgp)#neighbor 192.168.128.2 remote 99
Border Gateway Protocol (BGP)
177