BGP－backdoor案例

2007-08-02 17:10:06

　标签：BGP backdoor　　　[推送到技术圈]

R1(config)#int s2/1

R1(config-if)#ip add 12.0.0.1 255.255.255.0

R1(config-if)#no shu

R1(config-if)#int f0/0

R1(config-if)#ip add 21.0.0.1 255.255.255.0

R1(config-if)#no shu

R1(config-if)#int lo0

R1(config-if)#ip add 1.1.1.1 255.255.255.255

R1(config)#router ospf 1

R1(config-router)#router-id 1.1.1.1

R1(config-router)#net 12.0.0.0 0.0.0.255 a 0

R1(config-router)#net 21.0.0.0 0.0.0.255 a 0

R1(config-router)#net 1.1.1.1 0.0.0.0 a 0

R1(config-router)#exit

R1(config)#router bgp 100

R1(config-router)#bgp router-id 1.1.1.1

R1(config-router)#no syn

R1(config-router)#no au

R1(config-router)#nei 12.0.0.2 remote-as 200

R1(config-router)#nei 21.0.0.2 remote-as 200

R1(config-router)#net 1.1.1.1 mask 255.255.255.255

R1(config-if)#do clear ip bgp * s o

R2(config)#int s2/1

R2(config-if)#ip add 12.0.0.2 255.255.255.0

R2(config-if)#no shu

R2(config-if)#int f0/0

R2(config-if)#ip add 21.0.0.2 255.255.255.0

R2(config-if)#no shu

R2(config-if)#exit

R2(config)#router ospf 1

R2(config-router)#router-id 2.2.2.2

R2(config-router)#net 12.0.0.0 0.0.0.255 a 0

R2(config-router)#net 21.0.0.0 0.0.0.255 a 0

R2(config-router)#exit

R2(config)#router bgp 200

R2(config-router)#bgp router-id 2.2.2.2

R2(config-router)#no syn

R2(config-router)#no au

R2(config-router)#nei 12.0.0.1 remote-as 100

R2(config-router)#nei 21.0.0.1 remote-as 100

R2(config-router)#do sh ip bgp sum

Neighbor V AS MsgRcvd MsgSent TblVer InQ OutQ Up/Down State/PfxRcd

12.0.0.1 4 100 7 6 2 0 0 00:02:41 1

21.0.0.1 4 100 5 5 2 0 0 00:00:06 1

R2(config-router)#do sh ip bgp

BGP table version is 2, local router ID is 2.2.2.2

Status codes: s suppressed, d damped, h history, * valid, > best, i - internal,

r RIB-failure, S Stale

Origin codes: i - IGP, e - EGP, ? - incomplete

Network Next Hop Metric LocPrf Weight Path

* 1.1.1.1/32 21.0.0.1 0 0 100 i

*> 12.0.0.1 0 0 100 i

R2(config-router)#network 1.1.1.1 mask 255.255.255.255 backdoor

R2(config-router)#do sh ip bgp

BGP table version is 3, local router ID is 2.2.2.2

Status codes: s suppressed, d damped, h history, * valid, > best, i - internal,

r RIB-failure, S Stale

Origin codes: i - IGP, e - EGP, ? - incomplete

Network Next Hop Metric LocPrf Weight Path

r 1.1.1.1/32 21.0.0.1 0 0 100 i

r> 12.0.0.1 0 0 100 i

R2(config-router)#do sh ip route

Codes: C - connected, S - static, R - RIP, M - mobile, B - BGP

D - EIGRP, EX - EIGRP external, O - OSPF, IA - OSPF inter area

N1 - OSPF NSSA external type 1, N2 - OSPF NSSA external type 2

E1 - OSPF external type 1, E2 - OSPF external type 2

i - IS-IS, su - IS-IS summary, L1 - IS-IS level-1, L2 - IS-IS level-2

ia - IS-IS inter area, * - candidate default, U - per-user static route

o - ODR, P - periodic downloaded static route

Gateway of last resort is not set

1.0.0.0/32 is subnetted, 1 subnets

O 1.1.1.1 [110/2] via 21.0.0.1, 00:02:25, FastEthernet0/0

21.0.0.0/24 is subnetted, 1 subnets

C 21.0.0.0 is directly connected, FastEthernet0/0

12.0.0.0/24 is subnetted, 1 subnets

C 12.0.0.0 is directly connected, Serial2/1

R2(config-router)#no network 1.1.1.1 mask 255.255.255.255 backdoor

R2(config-router)#do sh ip bgp

BGP table version is 4, local router ID is 2.2.2.2

Status codes: s suppressed, d damped, h history, * valid, > best, i - internal,

r RIB-failure, S Stale

Origin codes: i - IGP, e - EGP, ? - incomplete

Network Next Hop Metric LocPrf Weight Path

* 1.1.1.1/32 21.0.0.1 0 0 100 i

*> 12.0.0.1 0 0 100 i

R2(config-router)#do sh ip route

Codes: C - connected, S - static, R - RIP, M - mobile, B - BGP

D - EIGRP, EX - EIGRP external, O - OSPF, IA - OSPF inter area

N1 - OSPF NSSA external type 1, N2 - OSPF NSSA external type 2

E1 - OSPF external type 1, E2 - OSPF external type 2

i - IS-IS, su - IS-IS summary, L1 - IS-IS level-1, L2 - IS-IS level-2

ia - IS-IS inter area, * - candidate default, U - per-user static route

o - ODR, P - periodic downloaded static route

Gateway of last resort is not set

1.0.0.0/32 is subnetted, 1 subnets

B 1.1.1.1 [20/0] via 12.0.0.1, 00:00:13

21.0.0.0/24 is subnetted, 1 subnets

C 21.0.0.0 is directly connected, FastEthernet0/0

12.0.0.0/24 is subnetted, 1 subnets

C 12.0.0.0 is directly connected, Serial2/1

R2(config-router)#do ping 1.1.1.1

Type escape sequence to abort.

Sending 5, 100-byte ICMP Echos to 1.1.1.1, timeout is 2 seconds:

!!!!!

Success rate is 100 percent (5/5), round-trip min/avg/max = 24/84/152 ms

R2(config-router)#

注：

R2(config-router)#network 1.1.1.1 mask 255.255.255.255 backdoor

R2(config-router)#no network 1.1.1.1 mask 255.255.255.255 backdoor

注意观察R2的ip路由变化，还有R2的bgp路由变化。

这是没有建立bgp时R1和R2之间跑完ospf后R2上学到的ip路由。

R2(config)#do sh ip route

Codes: C - connected, S - static, R - RIP, M - mobile, B - BGP

D - EIGRP, EX - EIGRP external, O - OSPF, IA - OSPF inter area

N1 - OSPF NSSA external type 1, N2 - OSPF NSSA external type 2

E1 - OSPF external type 1, E2 - OSPF external type 2

i - IS-IS, su - IS-IS summary, L1 - IS-IS level-1, L2 - IS-IS level-2

ia - IS-IS inter area, * - candidate default, U - per-user static route

o - ODR, P - periodic downloaded static route

Gateway of last resort is not set

1.0.0.0/32 is subnetted, 1 subnets

O 1.1.1.1 [110/2] via 21.0.0.1, 00:00:06, FastEthernet0/0

21.0.0.0/24 is subnetted, 1 subnets

C 21.0.0.0 is directly connected, FastEthernet0/0

12.0.0.0/24 is subnetted, 1 subnets

C 12.0.0.0 is directly connected, Serial2/1

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BGP－backdoor案例