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一、拓扑图

二、需求

五台路由器的环回地址均可互相访问

三、需求分析

1、完成所有IGP配置

2、使用直连接口建立EBGP

3、使用环回接口建立IBGP

4、使用connect-interface命令修改IBGP建邻的源接口

5、使用network命令发布路由

6、使用next-hop-local命令修改路由传递的下一跳属性

四、所有配置的文字描述及代码

1、配置R1到R5所有接口及环回接口IP地址

#r1
[r1]int g 0/0/0
[r1-GigabitEthernet0/0/0]ip address 12.0.0.1 24
[r1-GigabitEthernet0/0/0]int l 0
[r1-LoopBack0]ip address 1.1.1.1 32#r2
[r2]int g 0/0/0
[r2-GigabitEthernet0/0/0]ip address 12.0.0.2 24
[r2]int g 0/0/1
[r2-GigabitEthernet0/0/1]ip address 23.0.0.2 24
[r2-GigabitEthernet0/0/1]int l 0
[r2-LoopBack0]ip address 2.2.2.2 32#r3
[r3]int g 0/0/0
[r3-GigabitEthernet0/0/0]ip address 23.0.0.3 24
[r3]int g 0/0/1
[r3-GigabitEthernet0/0/1]ip address 34.0.0.3 24
[r3-GigabitEthernet0/0/1]int l 0
[r3-LoopBack0]ip address 3.3.3.3 32#r4
[r4]int g 0/0/0
[r4-GigabitEthernet0/0/0]ip address 34.0.0.4 24
[r4]int g 0/0/1
[r4-GigabitEthernet0/0/1]ip address 45.0.0.4 24
[r4-GigabitEthernet0/0/1]int l 0
[r4-LoopBack0]ip address 4.4.4.4 32#r5
[r5]int g 0/0/0
[r5-GigabitEthernet0/0/0]ip address 45.0.0.5 24
[r5-GigabitEthernet0/0/0]int l 0
[r5-LoopBack0]ip address 5.5.5.5 32
[r5]int l 1
[r5-LoopBack1]ip address 10.1.1.1 24

2、R1和R2通过直连接口建立EBGP

#r1
[r1]bgp 100
[r1-bgp]router-id 1.1.1.1
[r1-bgp]peer 12.0.0.2 as-number 200#r2
[r2]bgp 200
[r2-bgp]router-id 2.2.2.2
[r2-bgp]peer 12.0.0.1 as-number 100

3、R2、R3、R4之间通过环回接口建立IBGP

#r2
[r2]bgp 200
[r2-bgp]router-id 2.2.2.2
[r2-bgp]peer 3.3.3.3 as-number 200
[r2-bgp]peer 4.4.4.4 as-number 200
[r2-bgp]peer 3.3.3.3 connect-interface LoopBack 0
[r2-bgp]peer 4.4.4.4 connect-interface LoopBack 0#r3
[r3]bgp 200
[r3-bgp]router-id 3.3.3.3
[r3-bgp]peer 2.2.2.2 as-number 200
[r3-bgp]peer 4.4.4.4 as-number 200
[r3-bgp]peer 2.2.2.2 connect-interface LoopBack 0
[r3-bgp]peer 4.4.4.4 connect-interface LoopBack 0#r4
[r4]bgp 200
[r4-bgp]router-id 4.4.4.4
[r4-bgp]peer 2.2.2.2 as-number 200
[r4-bgp]peer 3.3.3.3 as-number 200
[r4-bgp]peer 2.2.2.2 connect-interface LoopBack 0
[r4-bgp]peer 3.3.3.3 connect-interface LoopBack 0

4、R4和R5通过环回接口IP地址建立EBGP并使用connect-interface命令修改IBGP建邻的源接口

5、R1和R5使用network命令发布路由

6、R2和R4使用next-hop-local命令修改路由传递的下一跳属性

#r2
[r2]bgp 200
[r2-bgp]peer 3.3.3.3 next-hop-local
[r2-bgp]peer 4.4.4.4 next-hop-local#r4
[r4]bgp 200
[r4-bgp]peer 2.2.2.2 next-hop-local
[r4-bgp]peer 3.3.3.3 next-hop-local

五、结果