要求：先在R2上將RIP重分佈到OSPF，再將R4上的RIP發佈到OSPF，觀察在R2和R4上學到的路由信息。
實驗結果：在R4上學到R3的路由爲O E2型的，在R2上學到的R3的路由爲R型的。
原因：R2將R3的路由先重分佈到OSPF中，在R4上從OSPF上學到的R3路由管理距離爲110，而從rip上學到的管理距離爲120，所以R4接收從OSPF上學到的路由，類型爲O E2,由於R4是通過LSA 5學到的路由，即通過DV算法學到的，水平分割，所以R4不會再將從RIP上學到的路由路由從R4上面的接口重分發出去，所以R2上沒有O E2型的。
R1
en
conf t
hos r1
int e0/0
ip add 192.168.12.1 255.255.255.0
no shu
exi
int e0/1
ip add 192.168.14.1 255.255.255.0
no shu
exi
int lo 0
ip add 1.1.1.1 255.255.255.0
exi
router ospf 1
net 192.168.12.0 0.0.0.255 ar 0
net 192.168.14.0 0.0.0.255 ar 0
net 1.1.1.0 0.0.0.255 ar 0
exi
R2
en
conf t
hos r2
int e0/0
ip add 192.168.12.2 255.255.255.0
no shu
exi
int e0/1
ip add 192.168.23.2 255.255.255.0
no shu
exi
router ospf 1
net 192.168.12.0 0.0.0.255 ar 0
redistribute rip subnets
exi
router rip
ver 2
no au
net 192.168.23.0
exi
R3
en
conf t
hos r3
int e0/1
ip add 192.168.23.3 255.255.255.0
no shu
exi
int e0/0
ip add 192.168.34.3 255.255.255.0
no shu
exi
int lo 0
ip add 3.3.3.3 255.255.255.0
exi
int e0/2
ip add 192.168.1.9 255.255.255.0
no shu
exi
router rip
ver 2
no au
net 192.168.23.0
net 192.168.34.0
net 3.3.3.0
net 192.168.1.0
exi
R4
en
conf t
hos r4
int e0/0
ip add 192.168.34.4 255.255.255.0
no shu
exi
int e0/1
ip add 192.168.14.4 255.255.255.0
no shu
exi
router ospf 1
net 192.168.14.0 0.0.0.255 ar 0
redistribute rip subnets
exi
router rip
ver 2
no au
net 192.168.34.0
exi
r1#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
C 192.168.12.0/24 is directly connected, Ethernet0/0
1.0.0.0/24 is subnetted, 1 subnets
C 1.1.1.0 is directly connected, Loopback0
C 192.168.14.0/24 is directly connected, Ethernet0/1
3.0.0.0/24 is subnetted, 1 subnets
O E2 3.3.3.0 [110/20] via 192.168.12.2, 00:01:54, Ethernet0/0
O E2 192.168.23.0/24 [110/20] via 192.168.12.2, 00:02:08, Ethernet0/0
O E2 192.168.34.0/24 [110/20] via 192.168.12.2, 00:01:54, Ethernet0/0
O E2 192.168.1.0/24 [110/20] via 192.168.12.2, 00:01:54, Ethernet0/0
r2#sho 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
C 192.168.12.0/24 is directly connected, Ethernet0/0
1.0.0.0/32 is subnetted, 1 subnets
O 1.1.1.1 [110/11] via 192.168.12.1, 00:02:28, Ethernet0/0
O 192.168.14.0/24 [110/20] via 192.168.12.1, 00:02:28, Ethernet0/0
3.0.0.0/24 is subnetted, 1 subnets
R 3.3.3.0 [120/1] via 192.168.23.3, 00:00:22, Ethernet0/1
C 192.168.23.0/24 is directly connected, Ethernet0/1
R 192.168.34.0/24 [120/1] via 192.168.23.3, 00:00:22, Ethernet0/1
R 192.168.1.0/24 [120/1] via 192.168.23.3, 00:00:22, Ethernet0/1
r4#sho ip rou
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
O 192.168.12.0/24 [110/20] via 192.168.14.1, 00:00:05, Ethernet0/1
1.0.0.0/32 is subnetted, 1 subnets
O 1.1.1.1 [110/11] via 192.168.14.1, 00:00:05, Ethernet0/1
C 192.168.14.0/24 is directly connected, Ethernet0/1
3.0.0.0/24 is subnetted, 1 subnets
O E2 3.3.3.0 [110/20] via 192.168.14.1, 00:00:05, Ethernet0/1
O E2 192.168.23.0/24 [110/20] via 192.168.14.1, 00:00:05, Ethernet0/1
C 192.168.34.0/24 is directly connected, Ethernet0/0
O E2 192.168.1.0/24 [110/20] via 192.168.14.1, 00:00:05, Ethernet0/1
本文出自 “Network_Linux” 博客，請務必保留此出處http://netman.blog.51cto.com/986341/371627
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