第一步、子网划分
172.16.0.0/16
AS2的骨干链路
172.16.0.0/30
172.16.0.4/30
172.16.0.8/30
172.16.0.12/30
172.16.0.16/30
172.16.0.20/30
AS2内的环回网段
172.16.2.0/24
172.16.3.0/24
172.16.4.0/24
172.16.5.0/24
172.16.6.0/24
172.16.7.0/24
汇总：172.16.0.0/21
第二步、开始基础配置
端口地址及环回地址
R1
[r1]interface g0/0/1
[r1-GigabitEthernet0/0/1]ip address 12.1.1.1 24
[r1-GigabitEthernet0/0/1]q
[r1]interface LoopBack 0
[r1-LoopBack0]ip address 192.168.1.1 24
[r1-LoopBack0]q
[r1]interface LoopBack 1
[r1-LoopBack1]ip address 10.1.1.1 24
R8
[r8]interface g0/0/0
[r8-GigabitEthernet0/0/0]ip address 78.1.1.2 24
[r8-GigabitEthernet0/0/0]q
[r8]interface LoopBack 0
[r8-LoopBack0]ip address 192.168.2.1 24
[r8-LoopBack0]q
[r8]interface LoopBack 1
[r8-LoopBack1]ip address 10.1.2.1 24
R2
[r2]interface g0/0/0
[r2-GigabitEthernet0/0/0]ip address 12.1.1.2 24
[r2-GigabitEthernet0/0/0]q
[r2]interface g0/0/1
[r2-GigabitEthernet0/0/1]ip address 172.16.0.1 30
[r2-GigabitEthernet0/0/1]q
[r2]interface g0/0/2
[r2-GigabitEthernet0/0/2]ip address 172.16.0.9 30
[r2-GigabitEthernet0/0/2]q
[r2]interface LoopBack 0
[r2-LoopBack0]ip address 172.16.2.1 24
R3-R7同理
查看
测试
第三步、在AS2内配置OSPF协议
[r2]ospf 1 router-id 2.2.2.2
[r2-ospf-1-area-0.0.0.0]network 172.16.0.0 0.0.255.255
R3-R7同理
查看
测试
第四步、配置BGP协议
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]confederation id 2 // 声明大号
[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 LoopBack 0//声明环回接口
[r2-bgp]confederation peer-as 64513 //声明小号
[r2-bgp]peer 172.16.5.1 as-number 64513
[r2-bgp]peer 172.16.5.1 connect-interface LoopBack 0//声明环回接口
[r2-bgp]peer 172.16.5.1 ebgp-max-hop 2 //修改端口限制
其他路由同理
查看
第五步、完成其他配置
1、在BGP上宣告R1与R8上的10.1.1.0/24 和10.1.2.0/24网段
R1上
[r1-bgp]network 10.1.1.0 24
R8上
[r8-bgp]network 10.1.2.0 24
2、在R2和R7上修改下一跳
R2上
[r2]bgp 64512
[r2-bgp]peer 172.16.3.1 next-hop-local
[r2-bgp]peer 172.16.5.1 next-hop-local
R7上
[r7]bgp 64513
[r7-bgp]peer 172.16.6.1 next-hop-local
[r7-bgp]peer 172.16.4.1 next-hop-local
display bgp routing-table
查看
3、在R3和R6上调反射器
R3上
[r3-bgp]peer 172.16.2.1 reflect-client
R6上
[r6-bgp]peer 172.16.5.1 reflect-client
查看
测试
4、宣告AS2内的网段
R2上
[r2]ip route-static 172.16.0.0 21 NULL 0
[r2]bgp 64512
[r2-bgp]network 172.16.0.0 21
R7上
[r7]ip route-static 172.16.0.0 21 NULL 0
[r7]bgp 64513
[r7-bgp]network 172.16.0.0 21
查看
测试
5、创建GRE使192.168.1.0/24与2.0/24可以相互通信
R1上
[r1]interface Tunnel 0/0/0
[r1-Tunnel0/0/0]ip address 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-Tunnel0/0/0]q
[r1]ip route-static 192.168.2.0 24 10.1.3.2
R8上
[r8]interface Tunnel 0/0/0
[r8-Tunnel0/0/0]ip address 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-Tunnel0/0/0]q
[r8]ip route-static 192.168.1.0 24 10.1.3.1
测试
