BGP基础实验

R1地址与环回

[r1]int g 0/0/0

[r1-GigabitEthernet0/0/0]ip add 12.1.1.1 24

[r1-GigabitEthernet0/0/0]int lo 0

[r1-LoopBack0]ip add 1.1.1.1 24

BGP

[r1]bgp 1

[r1-bgp]router-id 1.1.1.1

[r1-bgp]peer 12.1.1.2 as-number 2

[r1]dis ip routing-table

[r1]bgp 1

[r1-bgp]net 1.1.1.0 24

 

R2地址与环回

[r2]int g0/0/0

[r2-GigabitEthernet0/0/0]ip add 12.1.1.2 24

[r2-GigabitEthernet0/0/0]int lo 0

[r2-LoopBack0]ip add 2.2.2.2 24

[r2-LoopBack0]int g 0/0/1

[r2-GigabitEthernet0/0/1]ip add 23.1.1.1 24

OSPF

[r2]ospf 1 router-id 2.2.2.2

[r2-ospf-1]ar 0

[r2-ospf-1-area-0.0.0.0]net 23.1.1.1 0.0.0.0

[r2-ospf-1-area-0.0.0.0]net 2.2.2.0 0.0.0.255

BGP

bgp 2

router-id 2.2.2.2

peer 12.1.1.1 as-number 1

peer 3.3.3.3 as-number 2

peer 3.3.3.3 connect-interface LoopBack 0

[r2]bgp 2

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

[r2-bgp]peer 4.4.4.4 as 2

[r2-bgp]peer 4.4.4.4 connect-interface lo 0

[r2-bgp]peer 5.5.5.5 as 2

[r2-bgp]peer 5.5.5.5 connect-interface lo 0

[r2-bgp]peer 5.5.5.5 next-hop-local

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

宣告

[r2]bgp 2

[r2-bgp]net 2.2.2.0 24

[r2-bgp]net 3.3.3.0 24

Info: The network does not exist. （宣告配置中网络号和掩码必须和路由表中不一致导致不能宣告）

[r2-bgp]net 3.3.3.0 24

[r2-bgp]net 4.4.4.0 24

[r2-bgp]net 5.5.5.0 24

 

R3地址与环回

[r3]int g 0/0/0

[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 lo 0

[r3-LoopBack0]ip add 3.3.3.3 24

OSPF

[r3]ospf 1 router-id 3.3.3.3

[r3-ospf-1]are 0

[r3-ospf-1-area-0.0.0.0]net 23.1.1.2 0.0.0.0

[r3-ospf-1-area-0.0.0.0]net 34.1.1.1 0.0.0.0

[r3-ospf-1-area-0.0.0.0]net 3.3.3.0 0.0.0.255

BGP

bgp 2 

router-id 3.3.3.3

peer 4.4.4.4 as-number 2

peer 2.2.2.2 as-number 2

peer 2.2.2.2 connect-interface lo 0

peer 4.4.4.4 connect-interface lo 0

R3和R5建邻

[r3]bgp 2

[r3-bgp]peer 5.5.5.5 as 2

[r3-bgp]peer 5.5.5.5 connect-interface lo 0

修改接口类型（宣告配置中网络号和掩码必须和路由表中一致）

[r3]int lo 0

[r3-LoopBack0]ospf net  

[r3-LoopBack0]ospf network-type broadcast

R4地址与环回

[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 lo 0

[r4-LoopBack0]ip add 4.4.4.4 24

OSPF

[r4]ospf 1 router-id 4.4.4.4

[r4-ospf-1]are 0

[r4-ospf-1-area-0.0.0.0]net 34.1.1.2 0.0.0.0

[r4-ospf-1-area-0.0.0.0]net 45.1.1.1 0.0.0.0

[r4-ospf-1-area-0.0.0.0]net 4.4.4.0 0.0.0.255

BGP

[r4]bgp 2 

[r4-bgp]router-id 4.4.4.4

[r4-bgp]peer 3.3.3.3 as 2

[r4-bgp]peer 5.5.5.5 as 2

[r4-bgp]peer 3.3.3.3 connect-interface lo 0

[r4-bgp]peer 5.5.5.5 connect-interface lo 0

[r4]bgp 2

[r4-bgp]peer 2.2.2.2 as 2

[r4-bgp]peer 2.2.2.2 connect-interface lo 0

修改接口类型

[r4]int lo 0

[r4-LoopBack0]ospf net      

[r4-LoopBack0]ospf network-type broadcast

R5地址与环回

[r5]int g0/0/0

[r5-GigabitEthernet0/0/0]ip add 45.1.1.2 24

[r5-GigabitEthernet0/0/0]int g0/0/1

[r5-GigabitEthernet0/0/1]ip add 56.1.1.1 24

[r5-GigabitEthernet0/0/1]int g0/0/2

[r5-GigabitEthernet0/0/2]ip add 65.1.1.1 24

[r5-GigabitEthernet0/0/2]int lo 0

[r5-LoopBack0]ip add 5.5.5.5 24

OSPF

[r5]ospf 1 router-id 5.5.5.5

[r5-ospf-1]are 0

[r5-ospf-1-area-0.0.0.0]net 45.1.1.2 0.0.0.0

[r5-ospf-1-area-0.0.0.0]net 5.5.5.5 0.0.0.255

BGP建邻要底层路由能够互通

静态

[r5]ip route-static 6.6.6.0 24 56.1.1.2

[r5]ip route-static 6.6.6.0 24 65.1.1.2

BGP

[r5]bgp 2 

[r5-bgp]router-id 5.5.5.5

[r5-bgp]peer 4.4.4.4 as 2

[r5-bgp]peer 4.4.4.4 connect-interface lo 0

[r5-bgp]peer 6.6.6.6 as-number 3

[r5-bgp]peer 6.6.6.6 connect-interface lo 0

[r5-bgp]peer 6.6.6.6 ebgp-max-hop 2

[r5]bgp 2

[r5-bgp]peer 2.2.2.2 as 2

[r5-bgp]peer 2.2.2.2 connect-interface lo 0

由于R6BGP宣告传递到R5路由器上时不优，修改静态

[r5]undo ip route-static 6.6.6.0 56.1.1.2

[r5]undo ip route-static 6.6.6.0 65.1.1.2

[r5]ip route-static 6.6.6.6 32 65.1.1.2

[r5]ip route-static 6.6.6.6 32 56.1.1.2

修改本地

[r5]bgp 2

[r5-bgp]peer 4.4.4.4 next-hop-lo

[r5-bgp]peer 3.3.3.3 as 2

[r5-bgp]peer 3.3.3.3 connect-interface lo 0

[r5-bgp]peer 3.3.3.3 next-hop-local

[r5-bgp]peer 2.2.2.2 next-hop-local

修改接口类型

[r5]int lo 0

[r5-LoopBack0]ospf network-type broadcast

R6地址与环回

[r6]int g0/0/0

[r6-GigabitEthernet0/0/0]ip add 56.1.1.2 24

[r6-GigabitEthernet0/0/0]int g0/0/1

[r6-GigabitEthernet0/0/1]ip add 65.1.1.2 24

[r6-GigabitEthernet0/0/1]int lo 0

[r6-LoopBack0]ip add 6.6.6.6 24

BGP建邻要底层路由能够互通

静态

[r6]ip route-static 5.5.5.0 24 56.1.1.1

[r6]ip route-static 5.5.5.0 24 65.1.1.1

BGP

[r6]bgp 3 

[r6-bgp]router-id 6.6.6.6

[r6-bgp]peer 5.5.5.5 as 2

[r6-bgp]peer 5.5.5.5 connect-interface lo 0

[r6-bgp]peer 5.5.5.5 ebgp-max-hop 2

[r6]bgp 3

[r6-bgp]net 6.6.6.0  24

修改本地

[r6]undo ip route-static 5.5.5.0 24 56.1.1.1

[r6]undo ip route-static 5.5.5.0 24 65.1.1.1

[r6]ip route-static 5.5.5.5 32 56.1.1.1

[r6]ip route-static 5.5.5.5 32 65.1.1.1

R1BGP表

R2

R3

R1路由表

R2

R6