配IP：
r1：
[r1]int lo0
[r1-LoopBack0]ip add 192.168.1.1 24
[r1-LoopBack0]int lo1
[r1-LoopBack1]ip add 10.1.1.1 24
[r1-LoopBack1]int g0/0/0
[r1-GigabitEthernet0/0/0]ip add 12.1.1.1 24

r2：
[r2]int lo0
[r2-LoopBack0]ip add 172.16.2.1 24
[r2-LoopBack0]int g0/0/1
[r2-GigabitEthernet0/0/1]ip add 12.1.1.2 24
[r2-GigabitEthernet0/0/1]int g0/0/0
[r2-GigabitEthernet0/0/0]ip add 172.16.0.1 30
[r2-GigabitEthernet0/0/0]int g0/0/2
[r2-GigabitEthernet0/0/2]ip add 172.16.0.9 30

r3：
[r3]int lo0
[r3-LoopBack0]ip add 172.16.3.1 24
[r3-LoopBack0]int g0/0/1
[r3-GigabitEthernet0/0/1]ip add 172.16.0.2 30
[r3-GigabitEthernet0/0/1]int g0/0/0
[r3-GigabitEthernet0/0/0]ip add 172.16.0.5 30

r4：
[r4]int lo0
[r4-LoopBack0]ip add 172.16.4.1 24
[r4]int g0/0/1
[r4-GigabitEthernet0/0/1]ip add 172.16.0.6 30
[r4-GigabitEthernet0/0/1]int g0/0/2
[r4-GigabitEthernet0/0/2]ip add 172.16.0.21 30

r5：
[r5]int lo0
[r5-LoopBack0]ip add 172.16.5.1 24
[r5]int g0/0/1
[r5-GigabitEthernet0/0/1]ip add 172.16.0.10 30
[r5-GigabitEthernet0/0/1]int g0/0/0
[r5-GigabitEthernet0/0/0]ip add 172.16.0.13 30

r6：
[r6]int lo0
[r6-LoopBack0]ip add 172.16.6.1 24
[r6]int g0/0/1
[r6-GigabitEthernet0/0/1]ip add 172.16.0.14 30
[r6-GigabitEthernet0/0/1]int g0/0/0
[r6-GigabitEthernet0/0/0]ip add 172.16.0.17 30

r7：
[r7]int lo0
[r7-LoopBack0]ip add 172.16.7.1 24
[r7]int g0/0/1
[r7-GigabitEthernet0/0/1]ip add 172.16.0.18 30
[r7-GigabitEthernet0/0/0]int g0/0/2
[r7-GigabitEthernet0/0/2]ip add 172.16.0.22 30
[r7-GigabitEthernet0/0/2]int g0/0/0
[r7-GigabitEthernet0/0/0]ip add 78.1.1.1 24

r8：
[r8]int lo0
[r8-LoopBack0]int g0/0/1
[r8-GigabitEthernet0/0/1]ip add 78.1.1.2 24
[r8-GigabitEthernet0/0/1]int lo0
[r8-LoopBack0]ip add 172.168.2.1 24
[r8-LoopBack0]int lo1
[r8-LoopBack1]ip add 10.1.2.1 24

配置OSPF：
r2：
[r2]ospf 1 router-id 2.2.2.2
[r2-ospf-1]area 0
[r2-ospf-1-area-0.0.0.0]network 172.16.0.0 0.0.255.255

r3：
[r3]ospf 1 router-id 3.3.3.3
[r3-ospf-1]area 0
[r3-ospf-1-area-0.0.0.0]network 172.16.0.0 0.0.255.255

r4：
[r4]ospf 1 router-id 4.4.4.4
[r4-ospf-1]area 0
[r4-ospf-1-area-0.0.0.0] network 172.16.0.0 0.0.255.255

r5：
[r5]ospf 1 router-id 5.5.5.5
[r5-ospf-1]area 0
[r5-ospf-1-area-0.0.0.0] network 172.16.0.0 0.0.255.255

r6：
[r6]ospf 1 router-id 6.6.6.6
[r6-ospf-1]area 0
[r6-ospf-1-area-0.0.0.0] network 172.16.0.0 0.0.255.255

r7：
[r7]ospf 1 router-id 7.7.7.7
[r7-ospf-1]area 0
[r7-ospf-1-area-0.0.0.0] network 172.16.0.0 0.0.255.255

配置BGP：
r1：
[r1]bgp 1
[r1-bgp]router-id 1.1.1.1
[r1-bgp]peer 12.1.1.2 as-number 2

r2：
[r2]bgp 64512
[r2-bgp]router-id 2.2.2.2
[r2-bgp]peer 172.16.3.1 as-number 64512
[r2-bgp]confederation id 2
[r2-bgp]confederation peer-as 64513
[r2-bgp]peer 172.16.3.1 connect-interface LoopBack 0

[r2-bgp]peer 172.16.5.1 as-number 64513 – 跟r5建邻
[r2-bgp]peer 172.16.5.1 connect-interface LoopBack 0
[r2-bgp]peer 172.16.5.1 ebgp-max-hop 2 – 修改TTL值

[r2-bgp]peer 12.1.1.1 as-number 1

r3：
[r3]bgp 64512
[r3-bgp]router-id 3.3.3.3
[r3-bgp]confederation id 2
[r3-bgp]peer 172.16.2.1 as-number 64512
[r3-bgp]peer 172.16.2.1 connect-interface LoopBack 0

[r3-bgp]peer 172.16.4.1 as-number 64512
[r3-bgp]peer 172.16.4.1 connect-interface LoopBack 0

r4：
[r4]bgp 64512
[r4-bgp]router-id 4.4.4.4
[r4-bgp]confederation id 2
[r4-bgp]confederation peer-as 64513
[r4-bgp]peer 172.16.3.1 as-number 64512
[r4-bgp]peer 172.16.3.1 connect-interface LoopBack 0

[r4-bgp]peer 172.16.7.1 as-number 64513
[r4-bgp]peer 172.16.7.1 connect-interface LoopBack 0
[r4-bgp]peer 172.16.7.1 ebgp-max-hop 2

r5：
[r5]bgp 64513
[r5-bgp]router-id 5.5.5.5
[r5-bgp]confederation id 2
[r5-bgp]confederation peer-as 64512
[r5-bgp]peer 172.16.2.1 as-number 64512
[r5-bgp]peer 172.16.2.1 connect-interface LoopBack 0
[r5-bgp]peer 172.16.2.1 ebgp-max-hop 2

[r5-bgp]peer 172.16.6.1 as-number 64513
[r5-bgp]peer 172.16.6.1 connect-interface LoopBack 0

r6：
[r6]bgp 64513
[r6-bgp]router-id 6.6.6.6
[r6-bgp]confederation id 2
[r6-bgp]peer 172.16.5.1 as-number 64513
[r6-bgp]peer 172.16.5.1 connect-interface LoopBack 0

[r6-bgp]peer 172.16.7.1 as-number 64513
[r6-bgp]peer 172.16.7.1 connect-interface LoopBack 0

r7：
[r7]bgp 64513
[r7-bgp]router-id 7.7.7.7
[r7-bgp]confederation id 2
[r7-bgp]confederation peer-as 64512
[r7-bgp]peer 172.16.6.1 as-number 64513
[r7-bgp]peer 172.16.6.1 connect-interface LoopBack 0

[r7-bgp]peer 172.16.4.1 as-number 64512
[r7-bgp]peer 172.16.4.1 connect-interface LoopBack 0
[r7-bgp]peer 172.16.4.1 ebgp-max-hop 2

[r7-bgp]peer 78.1.1.2 as-number 3

r8：
[r8]bgp 3
[r8-bgp]router-id 8.8.8.8
[r8-bgp]peer 78.1.1.1 as-number 2

宣告BGP1：
r1：
[r1]bgp 1
[r1-bgp]network 10.1.1.0 24

r2：
[r2]bgp 64512
[r2-bgp]peer 172.16.3.1 next-hop-local

[r2-bgp]peer 172.16.5.1 next-hop-local

r3：
[r3]bgp 64512
[r3-bgp]peer 172.16.2.1 reflect-client – 反射器

r6：
[r6]bgp 64513
[r6-bgp]peer 172.16.5.1 reflect-client
r7：
[r7]bgp 64513
[r7-bgp]peer 172.16.4.1 next-hop-local

[r7-bgp]peer 172.16.6.1 next-hop-local

r8：
[r8]bgp 3
[r8-bgp]network 10.1.2.0 24

宣告BGP2：
r2：
[r2]ip route-static 172.16.0.0 21 NULL 0 – 空接口（减少路由条目）
[r2]bgp 64512
[r2-bgp]network 172.16.0.0 21

r7：
[r7]ip route-static 172.16.0.0 21 NULL 0
[r7]bgp 64513
[r7-bgp]network 172.16.0.0 21

做GRE：
r1：
[r1]int Tunnel 0/0/0
[r1-Tunnel0/0/0]ip add 10.1.3.1 24
[r1-Tunnel0/0/0]tunnel-protocol gre
[r1-Tunnel0/0/0]source 10.1.1.1
[r1-Tunnel0/0/0]destination 10.1.2.1

r8：
[r8]int Tunnel 0/0/0
[r8-Tunnel0/0/0]ip add 10.1.3.2 24
[r8-Tunnel0/0/0]tunnel-protocol gre
[r8-Tunnel0/0/0]source 10.1.2.1
[r8-Tunnel0/0/0]destination 10.1.1.1

写静态：
r1：
[r1]ip route-static 192.168.2.0 24 10.1.3.2

r8：
[r8]ip route-static 192.168.1.0 24 Tunnel 0/0/0