BGP后门链路.docx
- 文档编号:2944348
- 上传时间:2022-11-16
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BGP后门链路.docx
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BGP后门链路
后门链路是用在EBGP中的,在EBGP中的管理距离是20,在IBGP中的管理距离是200,最小的的IGP管
理距离也是90(EIGRP),所以不管是怎么样也会走EBGP(20)的选路,但是奇迹总是会出现的,现在
由后门链路修改,让本来走EBGP的路由走IGP路由。
正常配置如下:
R1:
interfaceLoopback0
ipaddress1.1.1.1255.255.255.0
!
interfaceFastEthernet0/0
ipaddress12.1.1.1255.255.255.0
duplexauto
speedauto
!
interfaceFastEthernet1/0
noipaddress
shutdown
duplexauto
speedauto
!
routerospf100
router-id1.1.1.1
log-adjacency-changes
network1.1.1.00.0.0.255area0
network12.1.1.00.0.0.255area0
!
routerbgp100
nosynchronization
bgprouter-id1.1.1.1
bgplog-neighbor-changes
network1.1.1.0mask255.255.255.0
neighbor2.2.2.2remote-as200
neighbor2.2.2.2ebgp-multihop255
neighbor2.2.2.2update-sourceLoopback0
noauto-summary
R2:
interfaceLoopback0
ipaddress2.2.2.2255.255.255.0
!
interfaceFastEthernet0/0
ipaddress23.1.1.1255.255.255.0
duplexauto
speedauto
!
interfaceFastEthernet1/0
ipaddress12.1.1.2255.255.255.0
duplexauto
speedauto
!
routerospf100
router-id2.2.2.2
log-adjacency-changes
network2.2.2.00.0.0.255area0
network12.1.1.00.0.0.255area0
network23.1.1.00.0.0.255area0
!
routerbgp200
nosynchronization
bgprouter-id2.2.2.2
bgplog-neighbor-changes
network2.2.2.0mask255.255.255.0
neighbor1.1.1.1remote-as100
neighbor1.1.1.1ebgp-multihop255
neighbor1.1.1.1update-sourceLoopback0
neighbor3.3.3.3remote-as300
neighbor3.3.3.3ebgp-multihop255
neighbor3.3.3.3update-sourceLoopback0
noauto-summary
R3:
interfaceLoopback0
ipaddress3.3.3.3255.255.255.0
!
interfaceFastEthernet0/0
noipaddress
shutdown
duplexauto
speedauto
!
interfaceFastEthernet1/0
ipaddress23.1.1.2255.255.255.0
duplexauto
speedauto
!
routerospf100
router-id3.3.3.3
log-adjacency-changes
network3.3.3.00.0.0.255area0
network23.1.1.00.0.0.255area0
!
routerbgp300
nosynchronization
bgprouter-id3.3.3.3
bgplog-neighbor-changes
network3.3.3.0mask255.255.255.0
neighbor2.2.2.2remote-as200
neighbor2.2.2.2ebgp-multihop255
neighbor2.2.2.2update-sourceLoopback0
noauto-summary
查看一下路由表:
R1:
1.0.0.0/24issubnetted,1subnets
C 1.1.1.0isdirectlyconnected,Loopback0
2.0.0.0/8isvariablysubnetted,2subnets,2masks
O 2.2.2.2/32[110/2]via12.1.1.2,00:
42:
56,FastEthernet0/0
B 2.2.2.0/24[20/0]via2.2.2.2,00:
15:
13
3.0.0.0/8isvariablysubnetted,2subnets,2masks
O 3.3.3.3/32[110/3]via12.1.1.2,00:
42:
56,FastEthernet0/0
B 3.3.3.0/24[20/0]via2.2.2.2,00:
31:
54
23.0.0.0/24issubnetted,1subnets
O 23.1.1.0[110/2]via12.1.1.2,00:
42:
56,FastEthernet0/0
12.0.0.0/24issubnetted,1subnets
C 12.1.1.0isdirectlyconnected,FastEthernet0/0
R2:
1.0.0.0/8isvariablysubnetted,2subnets,2masks
O 1.1.1.1/32[110/2]via12.1.1.1,00:
43:
41,FastEthernet1/0
B 1.1.1.0/24[20/0]via1.1.1.1,00:
16:
18
2.0.0.0/24issubnetted,1subnets
C 2.2.2.0isdirectlyconnected,Loopback0
3.0.0.0/8isvariablysubnetted,2subnets,2masks
O 3.3.3.3/32[110/2]via23.1.1.2,00:
43:
41,FastEthernet0/0
B 3.3.3.0/24[20/0]via3.3.3.3,00:
32:
29
23.0.0.0/24issubnetted,1subnets
C 23.1.1.0isdirectlyconnected,FastEthernet0/0
12.0.0.0/24issubnetted,1subnets
C 12.1.1.0isdirectlyconnected,FastEthernet1/0
R3:
1.0.0.0/8isvariablysubnetted,2subnets,2masks
O 1.1.1.1/32[110/3]via23.1.1.1,00:
44:
32,FastEthernet1/0
B 1.1.1.0/24[20/0]via2.2.2.2,00:
17:
09
2.0.0.0/8isvariablysubnetted,2subnets,2masks
O 2.2.2.2/32[110/2]via23.1.1.1,00:
44:
32,FastEthernet1/0
B 2.2.2.0/24[20/0]via2.2.2.2,00:
16:
39
3.0.0.0/24issubnetted,1subnets
C 3.3.3.0isdirectlyconnected,Loopback0
23.0.0.0/24issubnetted,1subnets
C 23.1.1.0isdirectlyconnected,FastEthernet1/0
12.0.0.0/24issubnetted,1subnets
O 12.1.1.0[110/2]via23.1.1.1,00:
44:
32,FastEthernet1/0
现在在R1,R2,R3上做后门链路
r1(config-router)#network1.1.1.0mask255.255.255.0backdoor
r2(config-router)#network2.2.2.0mask255.255.255.0backdoor
r3(config-router)#network3.3.3.0mask255.255.255.0backdoor 加上关键字backdoor
现在查看一下路由表:
R1:
1.0.0.0/24issubnetted,1subnets
C 1.1.1.0isdirectlyconnected,Loopback0
2.0.0.0/32issubnetted,1subnets
O 2.2.2.2[110/2]via12.1.1.2,00:
01:
37,FastEthernet0/0
3.0.0.0/32issubnetted,1subnets
O 3.3.3.3[110/3]via12.1.1.2,00:
01:
37,FastEthernet0/0
23.0.0.0/24issubnetted,1subnets
O 23.1.1.0[110/2]via12.1.1.2,00:
01:
37,FastEthernet0/0
12.0.0.0/24issubnetted,1subnets
C 12.1.1.0isdirectlyconnected,FastEthernet0/0
R2:
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- 关 键 词:
- BGP 后门