BGP基础实验

目录

ip 配置 

BGP的配置

EBGP邻居间存在多条直连的物理链路 

路由条目的宣告

宣告用户网段环回

验证

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题目

 

 

ip 配置 

r1

[r1]int g0/0/0
[r1-GigabitEthernet0/0/0]ip add 12.1.1.1 24
[r1]int lo0
[r1-LoopBack0]ip add 1.1.1.1 24
[r1-LoopBack0]int lo1
[r1-LoopBack1]ip add 11.1.1.1 32

r2

[r2-GigabitEthernet0/0/1]int g0/0/0
[r2-GigabitEthernet0/0/0]ip add 12.1.1.2 24
[r2-GigabitEthernet0/0/1]ip add 23.1.1.1 24
[r2-GigabitEthernet0/0/1]int lo0
[r2-LoopBack0]ip add 2.2.2.2 24
[r2-LoopBack0]int lo1
[r2-LoopBack1]ip add 22.1.1.1 32

r3

[r3]int g0/0/0
[r3-GigabitEthernet0/0/0]ip add 23.1.1.2 24
[r3-GigabitEthernet0/0/0]int g0/0/1
[r3-GigabitEthernet0/0/1]ip add 34.1.1.1 24
[r3-GigabitEthernet0/0/1]int lo0
[r3-LoopBack0]ip add 3.3.3.3 24
[r3-LoopBack0]int lo1
[r3-LoopBack1]ip add 33.1.1.1 32

r4

[r4]int g0/0/0
[r4-GigabitEthernet0/0/0]ip add 34.1.1.2 24
[r4-GigabitEthernet0/0/0]int g0/0/1
[r4-GigabitEthernet0/0/1]ip add 45.1.1.1 24
[r4-GigabitEthernet0/0/1]int lo0
[r4-LoopBack0]ip add 4.4.4.4 24
[r4-LoopBack0]int lo1
[r4-LoopBack1]ip add 44.1.1.1 32
[r4-bgp]int g0/0/2
[r4-GigabitEthernet0/0/2]ip add 54.1.1.2 24

r5

[r5]int g0/0/0
[r5-GigabitEthernet0/0/0]ip add 45.1.1.2 24
[r5-GigabitEthernet0/0/0]int lo0
[r5-LoopBack0]ip add 5.5.5.5 24
[r5-LoopBack0]int lo1
[r5-LoopBack1]ip add 55.1.1.1 32
[r5]int g0/0/1
[r5-GigabitEthernet0/0/1]ip add 54.1.1.1 24

r2

[r2]ospf 1 router-id 2.2.2.2
[r2-ospf-1]area 0
[r2-ospf-1-area-0.0.0.0]network 2.2.2.2 0.0.0.0
[r2-ospf-1-area-0.0.0.0]network 23.1.1.1 0.0.0.0

r3

[r3]ospf 1 router-id 3.3.3.3	
[r3-ospf-1]area 0	
[r3-ospf-1-area-0.0.0.0]network 23.1.1.2 0.0.0.0
[r3-ospf-1-area-0.0.0.0]network 3.3.3.3 0.0.0.0
[r3-ospf-1-area-0.0.0.0]network 34.1.1.1 0.0.0.0

r4

[r4]ospf 1 router-id 4.4.4.4
[r4-ospf-1]area 0
[r4-ospf-1-area-0.0.0.0]network 4.4.4.4 0.0.0.0
[r4-ospf-1-area-0.0.0.0]network 34.1.1.2 0.0.0.0

 

 

BGP的配置

r1 r2是EBGP 

r1

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

r2

[r2]bgp 2
[r2-bgp]router-id 2.2.2.2
[r2-bgp]peer 12.1.1.1 as-number 1

r2 

[r2]bgp 2 
[r2-bgp]peer 3.3.3.3 as-number 2
[r2-bgp]peer 3.3.3.3 connect-interface lo0

 

r3

[r3]bgp 2
[r3-bgp]router-id 3.3.3.3	
[r3-bgp]peer 2.2.2.2 as-number 2
[r3-bgp]peer 2.2.2.2 connect-interface lo0
[r3-bgp]peer 4.4.4.4 as-number 2
[r3-bgp]peer 4.4.4.4 connect-interface lo0

r4

[r4]bgp 2
[r4-bgp]router-id 4.4.4.4
[r4-bgp]peer 3.3.3.3 as-number 2
[r4-bgp]peer 3.3.3.3 connect-interface lo0

EBGP邻居间存在多条直连的物理链路 

r4 

 

[r4]ip route-static 5.5.5.0 24 45.1.1.2
[r4]ip route-static 5.5.5.0 24 54.1.1.1
[r4]bgp 2
[r4-bgp]peer 5.5.5.5 as-number 3
[r4-bgp]peer 5.5.5.5 connect-interface lo0
[r4-bgp]peer 5.5.5.5 ebgp-max-hop 2

r5

[r5]ip route-static 4.4.4.0 24 45.1.1.1
[r5]ip route-static 4.4.4.0 24 54.1.1.2
[r5]bgp 3	
[r5-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 lo0
[r5-bgp]peer 4.4.4.4 ebgp-max-hop 2

路由条目的宣告

r1

[r1]bgp 1
[r1-bgp]network 1.1.1.0 24

 

 r2和r4建邻，然后改变下一跳

r2

[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 lo0
[r2-bgp]peer 4.4.4.4 next-hop-local 

r4

[r4-bgp]peer 2.2.2.2 as-number 2
[r4-bgp]peer 2.2.2.2 connect-interface lo0

 

r5

[r5-bgp]network 5.5.5.0

r4

[r4]undo ip route-static 5.5.5.0 24
[r4]ip route-static 5.5.5.5 32 45.1.1.2
[r4]ip route-static 5.5.5.5 32 54.1.1.1

[r4]bgp 2	
[r4-bgp]peer 2.2.2.2 next-hop-local 
[r4-bgp]peer 3.3.3.3 next-hop-local

r2

[r2-bgp]network 2.2.2.0 24
[r2-bgp]peer 3.3.3.3 connect-interface lo0
[r2-bgp]peer 4.4.4.4 connect-interface lo0

r3

[r3-bgp]network 3.3.3.0 24
[r3-bgp]peer 2.2.2.2 connect-interface lo0
[r3-bgp]peer 4.4.4.4 connect-interface lo0

r4

[r4-bgp]network 4.4.4.0 24
[r4-bgp]peer 2.2.2.2 connect-interface lo0
[r4-bgp]peer 3.3.3.3 connect-interface lo0

宣告用户网段环回

r1

[r1]bgp 1
[r1-bgp]network 11.1.1.1 32

r2

[r2]bgp 2
[r2-bgp]network 22.1.1.1 32

r3

[r3]bgp 2
[r3-bgp]network 33.1.1.1 32

r4

[r4]bgp 2
[r4-bgp]network 44.1.1.1 32

r5

[r5]bgp 3
[r5-bgp]network 55.1.1.1 32

验证