实验拓扑：
IOU1的配置
Configure terminal
Interface ethernet 0/0
Duplex full
Ip address 10.0.10.1 255.255.255.0
No shutdown
Exit
Interface loopback 0
Ip address 1.1.1.1 255.255.255.255
No shutdown
Exit
配置bgp
Router bgp 100
Bgp router-id 1.1.1.1
No synchronization
Neighbor 10.0.10.2 remote-as 100
Network 1.1.1.0 mask 255.255.255.255
Network 10.0.10.0 mask 255.255.255.0
Neighbor 2.2.2.2 remote-as 100
Neighbor 2.2.2.2 update-source loopback 0
Neighbor 3.3.3.3 remote-as 100
Neighbor 3.3.3.3 update-source loopback 0
Exit
Router bgp 100
Neighbor 10.0.20.2 remote-as 100
Exit
配置ospf
Router ospf 1
Network 10.0.10.0 0.0.0.255 area 0
Network 1.1.1.1 0.0.0.0 area 0
exit
IOU2的配置
Configure terminal
Interface ethernet 0/0
Duplex full
Ip address 10.0.10.2 255.255.255.0
No shutdown
Exit
Interface ethernet 0/1
Duplex full
Ip address 10.0.20.1 255.255.255.0
No shutdown
Exit
Interface loopback 0
Ip address 2.2.2.2 255.255.255.0
No shutdown
Exit
配置bgp
Router bgp 100
Bgp router-id 2.2.2.2
No synchronization
Neighbor 1.1.1.1 remote-as 100
Neighbor 3.3.3.3 remote-as 100
Neighbor 1.1.1.1 update-source loopback 0
Neighbor 3.3.3.3 update-source loopback 0
Network 2.2.2.2 mask 255.255.255.255
Network 10.0.20.0 mask 255.255.255.0
Neighbor 10.0.10.1 remote-as 100
Neighbor 10.0.20.2 remote-as 100
Exit
配置ospf
Router ospf 1
Network
2.2.2.2 0.0.0.0 area 0
Network
10.0.10.0 0.0.0.255 area 0
Network
10.0.20.0 0.0.0.255 area 0
exit
IOU3的配置
Configure terminal
Interface ethernet 0/0
Duplex full
Ip address 10.0.20.2 255.255.255.0
No shutdown
Exit
Interface ethernet 0/1
Duplex full
Ip address 10.0.30.1 255.255.255.0
No shutdown
Exit
Interface loopback 0
Ip address 3.3.3.3 255.255.255.255
No shutdown
Exit
配置bgp
Router bgp 100
Bgp router-id 3.3.3.3
No synchronization
Network 10.0.30.0 mask 255.255.255.0
Neighbor 1.1.1.1 remote-as 100
Neighbor 2.2.2.2 remote-as 100
Neighbor 4.4.4.4 remote-as 200
Neighbor 4.4.4.4 update-source loopback 0
Neighbor 4.4.4.4 ebgp-multihop 10
Neighbor 10.0.20.1 remote-as 100
Exit
Router bgp 100
No synchronization
Neighbor 10.0.30.2 remote-as 200
Exit
Router bgp 100
Neighbor 1.1.1.1 remote-as 100
Neighbor 10.0.10.1 remote-as 100
Exit
Ip route 4.4.4.0 255.255.255.0 10.0.30.2
配置ospf
Router ospf 1
Network 3.3.3.3 0.0.0.0 area 0
Network 10.0.20.0 0.0.0.255 area 0
exit
IOU4的配置
Configure terminal
Interface ethernet 0/0
Duplex full
Ip address 10.0.30.2 255.255.255.0
No shutdown
Exit
Interface loopback 0
Ip address 4.4.0.1 255.255.255.0
No shutdown
Exit
Interface loopback 1
Ip address 4.4.1.1 255.255.255.0
No shutdown
Exit
Interface loopback 2
Ip address 4.4.2.1 255.255.255.0
No shutdown
Exit
Interface loopback 3
Ip address 4.4.3.1 255.255.255.0
No shutdown
Exit
配置bgp
Router bgp 200
Bgp router-id 4.4.4.4
No synchronization
Neighbor 3.3.3.3 remote-as 100
Neighbor 3.3.3.3 update-source loopback 0
Neighbor 3.3.3.3 ebgp-multihop 10
Network 4.4.3.0 mask 255.255.255.0
Network 4.4.2.0 mask 255.255.255.0
Network 4.4.1.0 mask 255.255.255.0
Network 4.4.0.0 mask 255.255.255.0
Neighbor 10.0.30.1 remote-as 100
Exit
Ip route 3.3.3.0 255.255.255.0 10.0.30.1
end
