实验：

r4:

int lo0

ip add 4.4.4.4 255.255.255.0

no sh

int f0/0

ip add 134.1.1.4 255.255.255.0

r3:int lo0

ip add 3.3.3.3 255.255.255.0

int f0/0

no sh

ip add 123.1.1.3 255.255.255.0

r1:

int lo0

ip add 1.1.1.1 255.255.255.0

int f0/0

ip add 134.1.1.1 255.255.255.0

no sh

int s1/0

ip add 12.1.1.1 255.255.255.0

no sh

r2:

int lo0

ip add 2.2.2.2 255.255.255.0

int s1/0

ip add 12.1.1.2 255.255.255.0

router bgp 2

no au

bgp router-id 2.2.2.2

no syn

neighbor 1.1.1.1 remote-as 13

neighbor 1.1.1.1 update-souce lo0

neighbor 1.1.1.1 ebgp-multihop

ip route 1.1.1.0 255.255.255.0 s1/0

r3:

router rip

ver 2

no au

net 3.0.0.0

net 134.1.0.0

r1:

router rip

ver 2

no au

net 134.1.0.0

net 1.0.0.0

router bgp 13

bgp router-id 1.1.1.1

no au

no syn

neighbor 2.2.2.2 remote-as 2

neighbor 2.2.2.2 update-souce lo0

neighbor 2.2.2.2 ebgp-multihop

ip route 2.2.2.0 255.255.255.0 s1/0

router bgp 13

neighbor 3.3.3.3 remote-as 13

neighbor 3.3.3.3 up lo0

neighbor 3.3.3.3 next-hop-self

r3:

router bgp 13

bgp router-id 3.3.3.3

no au

no syn

neighbor 1.1.1.1 remote-as 13

neighbor 1.1.1.1 update-souce lo0

neighbor 1.1.1.1 next-hop-self

neighbor 4.4.4.4 remote-as 4

neighbor 4.4.4.4 update-souce lo0

neighbor 4.4.4.4 ebgp-multihop

ip route 4.0.0.0 255.255.255.0 134.1.1.4

r4:

router bgp 4

bgp router-id 4.4.4.4

no au

no syn

neighbor 3.3.3.3 remote-as 13

neighbor 3.3.3.3 up lo0

neighbor 3.3.3.3 ebgp-multihop

ip route 3.3.3.0 255.255.255.0 134.1.1.3

ebgp不能使用默认路由建立邻居。

r2:

router bgp 2

net 2.2.2.0 mask 255.255.255.0

r4:

router bgp 4

net 4.4.4.0 mask 255.255.255.0

r3和r4通过直连建邻居。

router 4

no auto

no syn

neighbor 134.1.1.3 remote-as 13

net 4.4.4.0 mask 255.255.255.0

r3:

router bgp 13

neighhbor 134.1.1.4 remote-as 4

ir2:

int lo4

ip add 172.16.4.1 255.255.255.0

int lo5

ip add 172.16.5.1 255.255.255.0

int lo6

ip add 172.16.6.1 255.255.255.0

int lo7

ip add 172.16.7.1 255.255.255.0

eigrp/ospf

1.如何本地产生一条172.16.4.0/22的路由条目

2.这条172.16.4.0/22指向null0

ip route 172.16.4.0 255.255.252.0 null0

router bgp 2

net 172.16.4.0 mask 255.255.252.0