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在每个接口配置好地址和环回后

[r2]ospf 1 router-id 2.2.2.2	
[r2-ospf-1]area 0
[r2-ospf-1-area-0.0.0.0]network 23.1.1.0 0.0.0.255
[r2-ospf-1-area-0.0.0.0]network 2.2.2.2 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 23.1.1.0 0.0.0.255
[r3-ospf-1-area-0.0.0.0]ne 34.1.1.0 0.0.0.255
[r3-ospf-1-area-0.0.0.0]ne 3.3.3.3 0.0.0.0

[r4]ospf 1 router-id 4.4.4.4 	
[r4-ospf-1]area 0
[r4-ospf-1-area-0.0.0.0]ne 34.1.1.0 0.0.0.255
[r4-ospf-1-area-0.0.0.0]ne 4.4.4.4 0.0.0.0

在R2/R3/R4上使用ospf协议宣告IP地址和环回

[r2]bgp 2
[r2-bgp]router-id 2.2.2.2
[r2-bgp]peer 3.3.3.3 as-number 2	
[r2-bgp]peer 3.3.3.3 connect-interface LoopBack 0	
[r2-bgp]peer 3.3.3.3 next-hop-local
[r2-bgp]peer 4.4.4.4 as-number 2	
[r2-bgp]peer 4.4.4.4 connect-interface LoopBack 0
[r2-bgp]peer 4.4.4.4 next-hop-local

[r3]bgp 2
[r3-bgp]router-id 3.3.3.3
[r3-bgp]peer 2.2.2.2 as-path-filter 
[r3-bgp]peer 2.2.2.2 as-number 2 	
[r3-bgp]peer 2.2.2.2 connect-interface LoopBack 0
[r3-bgp]peer 2.2.2.2 next-hop-local 
[r3-bgp]peer 4.4.4.4 as-number 2
[r3-bgp]peer 4.4.4.4 connect-interface LoopBack 0
[r3-bgp]peer 4.4.4.4 next-hop-local

[r4]bgp 2
[r4-bgp]router-id 4.4.4.4
[r4-bgp]peer 2.2.2.2 as-number 2
[r4-bgp]peer 2.2.2.2 connect-interface LoopBack 0
[r4-bgp]peer 2.2.2.2 next-hop-local 
[r4-bgp]peer 3.3.3.3 as-number 2
[r4-bgp]peer 3.3.3.3 connect-interface LoopBack 0
[r4-bgp]peer 3.3.3.3 next-hop-local

使用bgp在r2/r3/r4相互建邻

[r1]ip route-static 2.2.2.0 24 12.1.1.2

[r2]ip route-static 1.1.1.0 24 12.1.1.1
（在r1和r2上面写上静态保证r1和r2环回是可达的）

[r1]bgp 1
[r1-bgp]router-id 1.1.1.1
[r1-bgp]peer 2.2.2.2 as-number 2
[r1-bgp]peer 2.2.2.2 connect-interface LoopBack 0
[r1-bgp]peer 2.2.2.2 ebgp-max-hop 2

[r2]bgp 2
[r2-bgp]peer 1.1.1.1 as-number 1
[r2-bgp]peer 1.1.1.1 connect-interface LoopBack 0
[r2-bgp]peer 1.1.1.1 ebgp-max-hop 2
（使用bgp让r1和r2建邻）

[r4]ip route-static 5.5.5.0 24 45.1.1.2
[r4]ip route-static 5.5.5.0 24 54.1.1.2

[r5]ip route-static 4.4.4.0 24 45.1.1.1
[r5]ip route-static 4.4.4.0 24 54.1.1.1
（在r4和r5上面写上静态保证r4和r5环回是可达的）

[r4]bgp 2
[r4-bgp]router-id 4.4.4.4
[r4-bgp]peer 5.5.5.5 as-number 3
[r4-bgp]peer 5.5.5.5 connect-interface LoopBack 0
[r4-bgp]peer 5.5.5.5 ebgp-max-hop 2

[r5]bgp 3
[r4-bgp]router-id 5.5.5.5
[r5-bgp]peer 4.4.4.4 as-number 2
[r5-bgp]peer 4.4.4.4 connect-interface LoopBack 0
[r5-bgp]peer 4.4.4.4 ebgp-max-hop 2
（使用bgp让r4和r5建邻）

[r1]int lo 1
[r1-LoopBack1]ip ad 10.1.1.1 24
[r1]bgp 1	
[r1-bgp]network 10.1.1.0 24
 
[r5]int lo 1
[r5-LoopBack1]ip ad 50.1.1.1 24
[r5-LoopBack1]q
[r5]bgp 3
[r5-bgp]network 50.1.1.0 24
在r1 和 r5上起一个业务接口在各自bgp中进行宣告

 可以看到学习到了环回接口可以正常通讯实验完成