实验要求

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点相通讯;

AS1的另一个环回为10.1.1.0/24，AS3的另一个环回为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

拓扑设计

配IP地址
按照拓扑设计给每台路由器配上合适的IP地址

ospf
[r2]ospf 1 router-id 2.2.2.2
[r2-ospf-1]area 0
[r2-ospf-1-area-0.0.0.0]network 172.16.0.1 0.0.0.0
[r2-ospf-1-area-0.0.0.0]net
[r2-ospf-1-area-0.0.0.0]network 172.16.3.0 0.0.0.255
[r2-ospf-1-area-0.0.0.0]net
[r2-ospf-1-area-0.0.0.0]network 172.16.128.1 0.0.0.0

[r3]ospf 1 router-id 3.3.3.3
[r3-ospf-1]area 0
[r3-ospf-1-area-0.0.0.0]network 172.16.1.1 0.0.0.0
[r3-ospf-1-area-0.0.0.0]network 172.16.3.0 0.0.0.255
[r3-ospf-1-area-0.0.0.0]network 172.16.4.1

r4]ospf 1 r
[r4]ospf 1 router-id 4.4.4.4
[r4-ospf-1]net
[r4-ospf-1]a
[r4-ospf-1]area 0
[r4-ospf-1-area-0.0.0.0]network 172.16.2.1 0.0.0.0
[r4-ospf-1-area-0.0.0.0]network 172.16.4.2 0.0.0.0

[r4-ospf-1-area-0.0.0.0]network 172.16.192.10.0.0.0

r5]ospf 1 router-id 5.5.5.5
[r5-ospf-1]area 0
[r5-ospf-1-area-0.0.0.0]network 172.16.128.2 0.0.0.0

[r5-ospf-1-area-0.0.0.0]network 172.16.64.1 0.0.0.0
[r5-ospf-1-area-0.0.0.0]net
[r5-ospf-1-area-0.0.0.0]network 172.16.67.1 0.0.0.0

r6]ospf 1 router-id 6.6.6.6
[r6-ospf-1]a
[r6-ospf-1]area 0
[r6-ospf-1-area-0.0.0.0]net
[r6-ospf-1-area-0.0.0.0]network 172.16.65.1 0.0.0.0
[r6-ospf-1-area-0.0.0.0]net
[r6-ospf-1-area-0.0.0.0]network 172.16.67.2 0.0.0.0
[r6-ospf-1-area-0.0.0.0]net
[r6-ospf-1-area-0.0.0.0]network 172.16.68.1 0.0.0.0

[r7]ospf 1 router-id 7.7.7.7
[r7-ospf-1]a
[r7-ospf-1]area 0
[r7-ospf-1-area-0.0.0.0]ne
[r7-ospf-1-area-0.0.0.0]network 172.16.66.1 0.0.0.0
[r7-ospf-1-area-0.0.0.0]n
[r7-ospf-1-area-0.0.0.0]network 172.16.68.2 0.0.0.0

r7-ospf-1-area-0.0.0.0]network 172.16.192.2

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

[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 172.16.1.1 as-number 64512
[r2-bgp]peer 172.16.1.1 connect-interface lo0
[r2-bgp]peer 172.16.64.1 as-number 64513
[r2-bgp]peer 172.16.64.1 ebgp-max-hop 2
[r2-bgp]peer 172.16.64.1 connect-interface LoopBack 0

[r3]bgp 64512
[r3-bgp]router-id 3.3.3.3
[r3-bgp]confederation id 2
[r3-bgp]peer 172.16.0.1 as-number 64512
[r3-bgp]peer 172.16.0.1 connect-interface LoopBack 0
[r3-bgp]peer 172.16.2.1 as-number 64512
[r3-bgp]peer 172.16.2.1 connect-interface LoopBack 0

[r4-bgp]router-id 4.4.4.4
[r4-bgp]confederation id 2
[r4-bgp]confederation peer-as 64513
[r4-bgp]peer 172.16.1.1 as-number 64512
[r4-bgp]peer 172.16.1.1 connect-interface LoopBack 0
[r4-bgp]peer 172.16.66.1 as-number 64513
[r4-bgp]peer 172.16.66.1 connect-interface LoopBack 0
[r4-bgp]peer 172.16.66.1 ebgp-max-hop

r5]bgp 64513
[r5-bgp]router-id 5.5.5.5
[r5-bgp]confederation id 2
[r5-bgp]confederation pe
[r5-bgp]peer 172.16.0.1 as-number 64512
[r5-bgp]peer 172.16.0.1 ebgp-max-hop
[r5-bgp]peer 172.16.0.1 connect-interface LoopBack 0
[r5-bgp]peer 172.16.65.1 as-number 64513
[r5-bgp]peer 172.16.65.1 connect-interface LoopBack 0

[r6]bgp 64513
[r6-bgp]confederation id 2
[r6-bgp]router-id 6.6.6.6
[r6-bgp]peer 172.16.64.1 as-number 64513
[r6-bgp]peer 172.16.64.1 connect-interface LoopBack 0
[r6-bgp]peer 172.16.66.1 as-number 64513
[r6-bgp]peer 172.16.66.1 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 172.16.2.1 as-number 64512
[r7-bgp]peer 172.16.2.1 ebgp-max-hop
[r7-bgp]peer 172.16.2.1 connect-interface LoopBack 0
[r7-bgp]peer 172.16.65.1 as-number 64513
[r7-bgp]peer 172.16.65.1 connect-interface LoopBack 0
[r7-bgp]peer 10.1.2.1 as-number 3
[r7-bgp]peer 10.1.2.1 connect-interface LoopBack 0
[r7-bgp]peer 10.1.2.1 next-hop-local

[r8-bgp]peer 172.16.66.1 as-number 64513
[r8-bgp]peer 172.16.66.1 connect-interface LoopBack 0
[r8-bgp]peer 172.16.66.1 next-hop-local

宣告

[r1-bgp]network 10.1.1.1 24

[r8-bgp]network 10.1.2.0 24

[r2-bgp]network 172.16.0.0 24

[r3-bgp]network 172.16.1.0 24

[r4-bgp]network 172.16.2.0 24

[r5-bgp]network 172.16.64.0 24

[r6-bgp]network 172.16.65.0 24

[r7-bgp]network 172.16.66.0 24

然后查看bgp数据表，R3R5写路由反射器

[r3-bgp]peer 172.16.2.1 reflect-client

[r6-bgp]peer 172.16.66.1 reflect-client

减少路由条目
[r2-bgp]aggregate 172.16.0.0 22 detail-suppressed

[r4-bgp]aggregate 172.16.0.0 22 detail-suppressed

[r5-bgp]aggregate 172.16.64.0 22 detail-suppressed

[r7-bgp]aggregate 172.16.64.0 22 detail-suppressed