配置如下：

R1:

[r1]int loo0
[r1-LoopBack0]ip add 192.168.1.1 24
[r1-LoopBack0]int loo1
[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
[r1]bgp 1
[r1-bgp]router-id 1.1.1.1
[r1-bgp]peer 12.1.1.2 as-number 2
[r1-bgp]network 10.1.1.0 24
[r1]int tu0/0/0
[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
[r1]ip route-static 192.168.2.0 24 tu0/0/0
[r1]ping -a 192.168.1.1 192.168.2.1

PING 192.168.2.1: 56 data bytes, press CTRL_C to break
Reply from 192.168.2.1: bytes=56 Sequence=1 ttl=255 time=60 ms
Reply from 192.168.2.1: bytes=56 Sequence=2 ttl=255 time=30 ms
Reply from 192.168.2.1: bytes=56 Sequence=3 ttl=255 time=60 ms
Reply from 192.168.2.1: bytes=56 Sequence=4 ttl=255 time=40 ms
Reply from 192.168.2.1: bytes=56 Sequence=5 ttl=255 time=40 ms

R2:

[r2]int loo0
[r2-LoopBack0]ip add 172.16.2.1 24
[r2-LoopBack0]int g0/0/0
[r2-GigabitEthernet0/0/0]ip add 12.1.1.2 24
[r2-GigabitEthernet0/0/0]int g0/0/1
[r2-GigabitEthernet0/0/1]ip add 172.16.0.1 30
[r2-GigabitEthernet0/0/1]int g0/0/2
[r2-GigabitEthernet0/0/2]ip add 172.16.0.17 30
[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
[r2]bgp 64512
[r2-bgp]router-id 2.2.2.2
[r2-bgp]confederation id 2
[r2-bgp]confederation peer-as 64513
[r2-bgp]peer 12.1.1.1 as-number 1
[r2-bgp]peer 172.16.3.1 as-number 64512
[r2-bgp]peer 172.16.3.1 connect-interface loo0
[r2-bgp]peer 172.16.5.1 as-number 6
[r2-bgp]peer 172.16.5.1 as-number 64513
[r2-bgp]peer 172.16.5.1 connect-interface loo0
[r2-bgp]peer 172.16.5.1 ebgp-max-hop
[r2-bgp]peer 172.16.3.1 next-hop-local
[r2-bgp]peer 172.16.5.1 next-hop-local
[r2]ip route-static 172.16.0.0 21 NULL 0
[r2]bgp 64512
[r2-bgp]network 172.16.0.0 21

R3:

[r3]int loo0
[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
[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
[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 loo0
[r3-bgp]peer 172.16.4.1 connect-interface loo0
[r3]peer 2.2.2.2 ref
[r3]bgp 64512
[r3-bgp]peer 172.16.2.1 reflect-client

R4:

[r4]int loo0
[r4-LoopBack0]ip add 172.16.4.1 24
[r4-LoopBack0]int g0/0/0
[r4-GigabitEthernet0/0/0]ip add 172.16.0.6 30
[r4-GigabitEthernet0/0/0]int g0/0/1
[r4-GigabitEthernet0/0/1]ip add 172.16.0.21 30
[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
[r4]bgp 64512
[r4-bgp]router-id 4.4.4.4
[r4-bgp]peer 172.16.3.1 as-number 64512
[r4-bgp]peer 172.16.3.1 connect-interface loo0
[r4-bgp]peer 172.16.7.1 as-number 64513
[r4-bgp]peer 172.16.7.1 connect-interface loo0
[r4-bgp]peer 172.16.7.1 ebgp-max-hop
[r4-bgp]confederation id 2

R5:

[r5]int loo0
[r5-LoopBack0]ip add 172.16.5.1 24
[r5-LoopBack0]int g0/0/2
[r5-GigabitEthernet0/0/2]ip add 172.16.0.18 30
[r5-GigabitEthernet0/0/2]int g0/0/1
[r5-GigabitEthernet0/0/1]ip add 172.16.0.9 30
[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
[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 loo0
[r5-bgp]peer 172.16.2.1 ebgp-max-hop
[r5-bgp]peer 172.16.6.1 as-number 64513
[r5-bgp]peer 172.16.6.1 connect-interface loo0

R6:

[r6]int loo0
[r6-LoopBack0]ip add 172.16.6.1 24
[r6-LoopBack0]int g0/0/1
[r6-GigabitEthernet0/0/1]ip add 172.16.0.10 30
[r6-GigabitEthernet0/0/1]int g0/0/0
[r6-GigabitEthernet0/0/0]ip add 172.16.0.13 30
[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
[r6]bgp 64513
[r6-bgp]router-id 6.6.6.6
[r6-bgp]confederation id 2
[r6-bgp]confederation pee
[r6-bgp]peer 172.16.5.1 as-number 64513
[r6-bgp]peer 172.16.5.1 connect-interface loo0
[r6-bgp]peer 172.16.7.1 as-number 64513
[r6-bgp]peer 172.16.7.1 connect-interface loo0
[r6]bgp 64513
[r6-bgp]peer 172.16.5.1 reflect-client

R7:

[r7]int loo0
[r7-LoopBack0]ip add 172.16.7.1 24
[r7-LoopBack0]int g0/0/0
[r7-GigabitEthernet0/0/0]ip add 172.16.0.14 30
[r7-GigabitEthernet0/0/0]int g0/0/1
[r7-GigabitEthernet0/0/1]ip add 172.16.0.22 30
[r7-GigabitEthernet0/0/1]int g0/0/2
[r7-GigabitEthernet0/0/2]ip add 78.1.1.1 24
[r7]ospf 1 router-id 7.7.7.7
[r7-ospf-1-area-0.0.0.0]network 172.16.0.0 0.0.255.255
[r7]bgp 64513
[r7-bgp]router-id 7.7.7.7
[r7-bgp]con [r7-bgp]confederation id 2
[r7-bgp]confederation peer-as 64512
[r7-bgp]peer 172.16.4.1 as-number 64512
[r7-bgp]peer 172.16.4.1 connect-interface loo0
[r7-bgp]peer 172.16.4.1 ebgp-max-hop
[r7-bgp]peer 172.16.6.1 as-number 64513
[r7-bgp]peer 172.16.6.1 connect-interface loo0
[r7-bgp]peer 78.1.1.2 as-number 3
[r7-bgp]peer 172.16.4.1 next-hop-local
[r7-bgp]peer 172.16.6.1 next-hop-local
[r7]ip route-static 172.16.0.0 21 NULL 0
[r7]bgp 64513
[r7-bgp]network 172.16.0.0 21

R8:

[r8]int loo0
[r8-LoopBack0]ip add 192.168.2.1 24
[r8-LoopBack0]int loo1
[r8-LoopBack1]ip add 10.1.2.1 24
[r8-LoopBack1]int g0/0/2
[r8-GigabitEthernet0/0/2]ip add 78.1.1.2 24
[r8]bgp 3
[r8-bgp]router-id 8.8.8.8
[r8-bgp]peer 78.1.1.1 as-number 2
[r8-bgp]network 10.1.2.0 24
[r8]int tu0/0/0
[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
[r8]ip route-static 192.168.1.0 24 tu0/0/0
[r8]ping -a 192.168.2.1 192.168.1.1

PING 192.168.1.1: 56 data bytes, press CTRL_C to break
Reply from 192.168.1.1: bytes=56 Sequence=1 ttl=255 time=90 ms
Reply from 192.168.1.1: bytes=56 Sequence=2 ttl=255 time=40 ms
Reply from 192.168.1.1: bytes=56 Sequence=3 ttl=255 time=60 ms
Reply from 192.168.1.1: bytes=56 Sequence=4 ttl=255 time=50 ms
Reply from 192.168.1.1: bytes=56 Sequence=5 ttl=255 time=60 ms