BGP基础实验

实验使用软件：eNSP

拓扑图：

实验要求：

1.如图连接网络，合理规格IP地址，AS200内IGP协议为OSPF

2.R1属于AS 100:R2-R3-R4小AS 234 R5-R6-R7小AS567，同时声明大AS 200，R8属于AS300

3.R2-R5 R4-R7之间为联邦EBGP邻居关系

4.R1-R8之间通信

实验步骤：

1、按照拓扑图给网络中设备配置IP地址

2、在AS200中运行OSPF协议，首先实现R2到R7可通

3、进行各个设备的BGP配置

[r1]bgp 100
[r1-bgp]router-id 1.1.1.1
[r1-bgp]peer 12.1.1.2 as-number 200

[r2]bgp 234
[r2-bgp]router-id 2.2.2.2
[r2-bgp]confederation id 200
[r2-bgp]confederation peer-as 567
[r2-bgp]peer 12.1.1.1 as-number 100
[r2-bgp]peer 3.3.3.3 as-number 234
[r2-bgp]peer 3.3.3.3 connect-interface l 0
[r2-bgp]peer 5.5.5.5 as-number 567
[r2-bgp]peer 5.5.5.5 connect-interface LoopBack 0
[r2-bgp]peer 5.5.5.5 ebgp-max-hop

[r3]bgp 234
[r3-bgp]router-id 3.3.3.3 
[r3-bgp]confederation id 200
[r3-bgp]peer 2.2.2.2 as	
[r3-bgp]peer 2.2.2.2 as-number 234
[r3-bgp]peer 2.2.2.2 connect-interface LoopBack 0
[r3-bgp]peer 4.4.4.4 as-number 234
[r3-bgp]peer 4.4.4.4 connect-interface LoopBack 0

[r4]bgp 234
[r4-bgp]router-id 4.4.4.4
[r4-bgp]confederation id 200
[r4-bgp]confederation peer-as 567
[r4-bgp]peer 3.3.3.3 as-number 234
[r4-bgp]peer 3.3.3.3 connect-interface LoopBack 0
[r4-bgp]peer 7.7.7.7 as-number 567
[r4-bgp]peer 7.7.7.7 connect-interface LoopBack 0
[r4-bgp]peer 7.7.7.7 ebgp-max-hop

[r5]bgp 567
[r5-bgp]router-id 5.5.5.5
[r5-bgp]confederation id 200
[r5-bgp]confederation peer-as 234
[r5-bgp]peer 2.2.2.2 as-number 234	
[r5-bgp]peer 2.2.2.2 connect-interface LoopBack 0
[r5-bgp]peer 2.2.2.2 ebgp-max-hop 
[r5-bgp]peer 6.6.6.6 as-number 567
[r5-bgp]peer 6.6.6.6 connect-interface LoopBack 0

[r6]bgp 567
[r6-bgp]router-id 6.6.6.6
[r6-bgp]confederation id 200
[r6-bgp]peer 5.5.5.5 as-number 567
[r6-bgp]peer 5.5.5.5 connect-interface LoopBack 0
[r6-bgp]peer 7.7.7.7 as-number 567
[r6-bgp]peer 7.7.7.7 connect-interface LoopBack 0

[r7]bgp 567
[r7-bgp]confederation id 200
[r7-bgp]router-id 7.7.7.7
[r7-bgp]confederation peer-as 234
[r7-bgp]peer 6.6.6.6 as-number 567
[r7-bgp]peer 6.6.6.6 connect-interface LoopBack 0
[r7-bgp]peer 4.4.4.4 as-number 234
[r7-bgp]peer 4.4.4.4 connect-interface LoopBack 0
[r7-bgp]peer 4.4.4.4 ebgp-max-hop 
[r7-bgp]peer 78.1.1.2 as-number 300

[r8]bgp 300
[r8-bgp]router-id 8.8.8.8
[r8-bgp]peer 78.1.1.1 as-number 200

4、进行宣告

[r1-bgp]import-route  direct

[r2-bgp]import-route ospf 1
[r2-bgp]import-route direct

[r7-bgp]import-route ospf 1
[r7-bgp]import-route direct

[r8-bgp]import-route direct

5、此时宣告的路由不优，（比如在R3路由器上面查看路由表，发现无法到达R1，所以在R2上面将下一跳改为local）

[r2-bgp]peer 3.3.3.3 next-hop-local

[r4-bgp]peer 3.3.3.3 next-hop-local

[r5-bgp]peer 6.6.6.6 next-hop-local

[r7-bgp]peer 6.6.6.6 next-hop-local

6、由于存在水平分割问题，所以还需要添加反射器

[r3-bgp]peer 2.2.2.2 reflect-client 
[r3-bgp]peer 4.4.4.4 reflect-client

[r6-bgp]peer 5.5.5.5 reflect-client 
[r6-bgp]peer 7.7.7.7 reflect-client

7、此时才完成全网可达，进行ping测试验证

BGP基础实验

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