实验二十四、OSPF 在NBMA 环境中点到点的配置

一、 实验目的

1. 掌握NBMA 环境中点到点的配置

2. 理解NBMA 环境中点到点网络类型的意义

二、 应用环境

在帧中继的网络中，OSPF 的路由更新不能正常进行，需要配置点到点的网络类型保证OSPF

协议的正常运行

三、 实验设备

1. DCR-1751 两台

2. CR-V35MT 一条

3. CR-V35FC 一条

四、 实验拓扑

clip_image002

五、 实验要求

配置表

ROUTER-A ROUTER-B

S1/1 （DCE ） 192.168.1.1/24 S1/0 (DTE) 192.168.1.2/24

F0/0 192.168.0.1 F0/0 192.169.2.1/24

在路由器的之间的接口封装帧中继。

六、 实验步骤

第一步：参照实验14，配置帧中继，并测试连通性

第二步：配置OSPF 协议

Router-A#conf Router-A_config#router ospf 2

Router-A_config_ospf_2#net 192.168.0.0 255.255.255.0 area 0

Router-A_config_ospf_2#net 192.168.1.0 255.255.255.0 area 0

Router-B#conf

Router-B_config#router ospf 10

Router-B_config_ospf_10#net 192.168.1.0 255.255.255.0 area 0

Router-B_config_ospf_10#net 192.168.2.0 255.255.255.0 area 0

第三步：查看路由表

Router-A#sh ip route

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

D - DEIGRP, DEX - external DEIGRP, O - OSPF, OIA - OSPF inter area

ON1 - OSPF NSSA external type 1, ON2 - OSPF NSSA external type 2

OE1 - OSPF external type 1, OE2 - OSPF external type 2

DHCP - DHCP type

VRF ID: 0

C 192.168.0.0/24 is directly connected, FastEthernet0/0

C 192.168.1.0/24 is directly connected, Serial1/1

Router-B#sh ip route

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

D - DEIGRP, DEX - external DEIGRP, O - OSPF, OIA - OSPF inter area

ON1 - OSPF NSSA external type 1, ON2 - OSPF NSSA external type 2

OE1 - OSPF external type 1, OE2 - OSPF external type 2

DHCP - DHCP type

VRF ID: 0

C 192.168.1.0/24 is directly connected, Serial1/0

C 192.168.2.0/24 is directly connected, FastEthernet0/0

！都没有得到OSPF 路由

第四步：修改网络类型

Router-A#conf

Router-A_config#int s1/1

Router-A_config_s1/1#ip ospf net point-to-point ！配置网络类型为点到点

Router-B#conf

Router-B_config#int s1/0

Router-B_config_s1/0#ip ospf net point-to-point ！配置网络类型为点到点第五步：再次查看路由表

Router-A#sh ip route

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

D - DEIGRP, DEX - external DEIGRP, O - OSPF, OIA - OSPF inter area

ON1 - OSPF NSSA external type 1, ON2 - OSPF NSSA external type 2

OE1 - OSPF external type 1, OE2 - OSPF external type 2

DHCP - DHCP type

VRF ID: 0

C 192.168.0.0/24 is directly connected, FastEthernet0/0

C 192.168.1.0/24 is directly connected, Serial1/1

O 192.168.2.0/24 [110,1601] via 192.168.1.2(on Serial1/1)

Router-B#sh ip route

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

D - DEIGRP, DEX - external DEIGRP, O - OSPF, OIA - OSPF inter area

ON1 - OSPF NSSA external type 1, ON2 - OSPF NSSA external type 2

OE1 - OSPF external type 1, OE2 - OSPF external type 2

DHCP - DHCP type

VRF ID: 0

O 192.168.0.0/24 [110,1601] via 192.168.1.1(on Serial1/0)

C 192.168.1.0/24 is directly connected, Serial1/0

C 192.168.2.0/24 is directly connected, FastEthernet0/0

第六步：查看OSPF 网络类型

Router-A#sh ip ospf interface

FastEthernet0/0 is up, line protocol is up

Internet Address: 192.168.0.1/24

Nettype: Broadcast

OSPF process is 2, AREA: 0, Router ID: 192.168.1.1

Cost: 1, Transmit Delay is 1 sec, Priority 1

Hello interval is 10, Dead timer is 40, Retransmit is 5

OSPF INTF State is IDr

Designated Router ID: 192.168.1.1, Interface address 192.168.0.1

Neighbor Count is 0, Adjacent neighbor count is 0

Serial1/1 is up, line protocol is up

Internet Address: 192.168.1.1/24

Nettype: Point-to-Point

OSPF process is 2, AREA: 0, Router ID: 192.168.1.1

Cost: 1600, Transmit Delay is 1 sec, Priority 1 Hello interval is 10, Dead timer is 40, Retransmit is 5

OSPF INTF State is IPOINT_TO_POINT

Neighbor Count is 1, Adjacent neighbor count is 1

Adjacent with neighbor 192.168.1.2

Router-A#sh ip ospf neighbor

----------------------------------------------------------------------------

OSPF process: 2

AREA: 0

Neighbor ID Pri State DeadTime Neighbor Addr Interface

192.168.2.1 1 FULL/- 31 192.168.1.2 Serial1/1

！注意到没有DR 的选举过程