R1配置：
router bgp 1
 no synchronization
 bgp log-neighbor-changes
 neighbor 12.1.1.2 remote-as 2
 neighbor 12.1.1.2 password ccie
 no auto-summary
R2配置：
router bgp 2
 bgp log-neighbor-changes
 neighbor 12.1.1.1 remote-as 1
 neighbor 12.1.1.1 password ccie
 neighbor 23.1.1.2 remote-as 3
 neighbor 23.1.1.2 password ccie2
R3配置：
router bgp 3
 bgp log-neighbor-changes
 neighbor 23.1.1.1 remote-as 2
 neighbor 23.1.1.1 password ccie2

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