BGP实验

【1】配置IP地址

AR1

[r1]interface g0/0/0
[r1-GigabitEthernet0/0/0]ip address 12.0.0.1 24

[r1]interface loopback 0
[r1-LoopBack0]ip address 1.1.1.1 24

AR2

[r2]interface g0/0/0
[r2-GigabitEthernet0/0/0]ip address 12.0.0.2 24

[r2]interface loopback 0
[r2-LoopBack0]ip address 2.2.2.2 24

[r2]interface g0/0/1
[r2-GigabitEthernet0/0/1]ip address 23.0.0.1 24

AR3

[r3]interface g0/0/1
[r3-GigabitEthernet0/0/1]ip address 34.0.0.1 24

[r3]interface loopback 0
[r3-LoopBack0]ip address 3.3.3.3 24

[r3]interface g0/0/0
[r3-GigabitEthernet0/0/0]ip address 23.0.0.2 24

AR4

[r4]interface g0/00/0
[r4-GigabitEthernet0/0/0]ip address 34.0.0.2 24

[r4]interface loopback 0
[r4-LoopBack0]ip address 4.4.4.4 24

[r4]interface g0/0/1
[r4-GigabitEthernet0/0/1]ip address 45.0.0.1 24

AR5

[r5]interface g0/0/0
[r5-GigabitEthernet0/0/0]ip address 45.0.0.2 24

[r5]interface loopback 0
[r5-LoopBack0]ip address 5.5.5.5 24

[r2]ospf 1 router-id 2.2.2.2 

[r2-ospf-1]area 0
[r2-ospf-1-area-0.0.0.0]network 2.2.2.2 0.0.0.0
[r2-ospf-1-area-0.0.0.0]network 23.0.0.0 0.0.0.255

 【2】运行OSPF协议

[r3-ospf-1]area 0
[r3-ospf-1-area-0.0.0.0]network 23.0.0.0 0.0.0.255

[r3-ospf-1-area-0.0.0.0]network 3.3.3.3 0.0.0.0
[r3-ospf-1-area-0.0.0.0]network 34.0.0.0 0.0.0.255

[r4]ospf 1 router-id 4.4.4.4
[r4-ospf-1]area 0
[r4-ospf-1-area-0.0.0.0]network 34.0.0.0 0.0.0.255

[r4-ospf-1-area-0.0.0.0]network 4.4.4.4 0.0.0.0

 【3】BGP

[r1]bgp 1
[r1-bgp]router-id 1.1.1.1
[r1-bgp]peer 12.0.0.2 as-number 2

[r2]bgp 2
[r2-bgp]router-id 2.2.2.2
[r2-bgp]peer 12.0.0.1 as-number 1

[r2-bgp]peer 3.3.3.3 as-number 2
[r2-bgp]peer 3.3.3.3 connect-interface loopback 0

[r3]bgp 2
[r3-bgp]router-id 3.3.3.3
[r3-bgp]peer 2.2.2.2 as-number 2

[r3-bgp]peer 2.2.2.2 connect-interface loopback 0

[r3-bgp]peer 4.4.4.4 as-number 2
[r3-bgp]peer 4.4.4.4 connect-interface loopback 0

[r4]bgp 2
[r4-bgp]router-id 4.4.4.4[r4-bgp]peer 3.3.3.3 as-number 2
[r4-bgp]peer 3.3.3.3 connect-interface loopback
[r4-bgp]peer 45.0.0.2 as-number 3

[r5]bgp 3
[r5-bgp]router-id 5.5.5.5
[r5-bgp]peer 45.0.0.1 as-number 2

【4】发布路由

[r1-bgp]network 1.1.1.0 24

[r5-bgp]network 5.5.5.0 24

 【5】修改下一跳属性

[r4-bgp]peer 3.3.3.3 next-hop-local

[r4-bgp]peer 2.2.2.2 next-hop-local

[r2-bgp]peer 3.3.3.3 next-hop-local

[r2-bgp]peer 4.4.4.4 next-hop-local