要求：
1、AS1存在两个环回, 一个地址为192.168.1.0/24该地址不能在任何协议中宣告AS3存在两个环回,
一个地址为192.168.2.0/24该地址不能在任何协议中宣告 最终要求这两个环回可以互相通讯;
AS1的另一个环回为10.1.1.0/24 AS3的另-个环回为10.1.2.0/24
2、整个AS2的ip地址为172.16.0.0.请合理划分
3、AS间的骨干链路ip地址随意定制
4、使用BGP协议让整个网络所有设备的环回可以相互访问
5、减少条目数量,避免环路出现
?
第一步：拓扑搭建
第二步：配置IP地址
[r1]int lo0
[r1-LoopBack0]ip address 192.168.1.1 24
[r1-LoopBack0]int lo 1
[r1-LoopBack1]ip address 10.1.1.1 24
[r1-LoopBack1]int g0/0/1
[r1-GigabitEthernet0/0/1]ip address 12.1.1.1 24
[r2]int lo0
[r2-LoopBack0]ip address 172.16.2.1 24
[r2-LoopBack0]int g0/0/0
[r2-GigabitEthernet0/0/0]ip address 12.1.1.2 24
[r2-GigabitEthernet0/0/0]int g0/0/1
[r2-GigabitEthernet0/0/1]ip address 172.16.0.1 30
[r2]int g0/0/2
[r2-GigabitEthernet0/0/2]ip address 172.16.0.9 30
[r3]int g0/0/0
[r3-GigabitEthernet0/0/0]ip address 172.16.0.2 30
[r3-GigabitEthernet0/0/0]int g0/0/1
[r3-GigabitEthernet0/0/1]ip address 172.16.0.5 30
[r3-GigabitEthernet0/0/1]int lo0
[r3-LoopBack0]ip address 172.16.3.1 24
[r4]int lo0
[r4-LoopBack0]ip address 172.16.4.1 24
[r4-LoopBack0]int g0/0/0
[r4-GigabitEthernet0/0/0]ip address 172.16.0.6 30
[r4-GigabitEthernet0/0/0]int g0/0/2
[r4-GigabitEthernet0/0/2]ip address 172.16.0.21 30
[r5]int lo0
[r5-LoopBack0]ip address 172.16.5.1 24
[r5-LoopBack0]int g0/0/2
[r5-GigabitEthernet0/0/2]ip address 172.16.0.10 30
[r5-GigabitEthernet0/0/2]int g0/0/1
[r5-GigabitEthernet0/0/1]ip address 172.16.0.13 30
[r6]int lo0
[r6-LoopBack0]ip address 172.16.6.1 24
[r6-LoopBack0]int g0/0/0
[r6-GigabitEthernet0/0/0]ip address 172.16.0.14 30
[r6-GigabitEthernet0/0/0]int g0/0/1
[r6-GigabitEthernet0/0/1]ip address 172.16.0.17 30
[r7]int lo0
[r7-LoopBack0]ip address 172.16.7.1 24
[r7-LoopBack0]int g0/0/0
[r7-GigabitEthernet0/0/0]ip address 172.16.0.18 30
[r7-GigabitEthernet0/0/0]int g0/0/2
[r7-GigabitEthernet0/0/2]ip address 172.16.0.22 30
[r7-GigabitEthernet0/0/2]int g0/0/1
[r7-GigabitEthernet0/0/1]ip address 78.1.1.1 24
[r8]int lo0
[r8-LoopBack0]ip address 192.168.2.1 24
[r8-LoopBack0]int lo1
[r8-LoopBack1]ip address 10.1.2.1 24
[r8-LoopBack1]int g0/0/0
[r8-GigabitEthernet0/0/0]ip address 78.1.1.2 24第三步:配置OSPF：由于R2/3/4/5/6/7都是在172.16.0.0的区间内,所有在OSPF区域内的路由器都可以这样进行宣告。
[r2-ospf-1]display this
[V200R003C00]
#
ospf 1 router-id 2.2.2.2
area 0.0.0.0
network 172.16.0.0 0.0.255.255
#
return测试：
?
?第四步:起BGP协议
[r1]bgp 1
[r1-bgp]router-id 1.1.1.1
[r1-bgp]peer 12.1.1.2 as-number 2
[r2]bgp 64512
[r2-bgp]router-id 2.2.2.2
[r2-bgp]confederation id 2
[r2-bgp]peer 172.16.3.1 as-number 64512
[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
[r2-bgp]peer 172.16.5.1 connect-interface LoopBack 0
[r2-bgp]peer 172.16.5.1 ebgp-max-hop 2
[r2-bgp]peer 12.1.1.1 as-number 1
[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]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]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]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]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]bgp 3
[r8-bgp]router-id 8.8.8.8
[r8-bgp]peer 78.1.1.1 as-number 2
测试:
第五步:宣告路由
[r1]bgp 1
[r1-bgp]network 10.1.1.0 24
[r2]bgp 64512
[r2-bgp]peer 172.16.3.1 next-hop-local
[r2-bgp]peer 172.16.5.1 next-hop-local
[r3]bgp 64512
[r3-bgp]peer 172.16.2.1 reflect-client
[r6]bgp 64513
[r6-bgp]peer 172.16.5.1 reflect-client
[r8]bgp 3
[r8-bgp]network 10.1.2.0 24
[r7]bgp 64513
[r7-bgp]peer 172.16.4.1 next-hop-local
[r7-bgp]peer 172.16.6.1 next-hop-local?R7上有两条路由,分别是R4和R6发送到R7上的,属性不变,BGP默认仅相信一条
?用于筛选路由条目:
[r7]display bgp routing-table peer 172.16.4.1 received-routes 第六步:创建空接口路由,防止环路出现
[r2]ip route-static 172.16.0.0 21 NULL 0
[r2]bgp 64512
[r2-bgp]network 172.16.0.0 21
[r7]ip route-static 172.16.0.0 21 NULL 0
[r7]bgp 64513
[r7-bgp]network 172.16.0.0 21第七步:创建Tunnel接口,接通R1和R8的192的环回
[r1]int 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]ip route-static 192.168.2.0 24 10.1.3.2
[r8]int t0/0/0
[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]ip route-static 192.168.1.0 24 10.1.3.1
?实验完成:
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