OSPF 认证
1.实验目的
通过本实验可以掌握：
（1）OSPF 认证的类型和意义
（2）基于区域的OSPF 简单口令认证的配置和调试
2实验环境
如下图所示
3.实验步骤
（1）步骤1：配置路由器R1
R1(config)#router ospf 1
R1(config-router)#router-id 1.1.1 .1
R1(config-router)#network 192.168.12.0 255.255.255.0 area 0
R1(config-router)#network 1.1.1 .0 255.255.255.0 area 0
R1(config-router)#area 0 authentication //区域0 启用简单口令认证
R1(config)#interface s0/0/0
R1(config-if)#ip ospf authentication-key cisco //配置认证密码
（2）步骤2：配置路由器R2
R2(config)#router ospf 1
R2(config-router)#router-id 2.2.2 .2
R2(config-router)#network 2.2.2 .0 255.255.255.0 area 0
R2(config-router)#network 192.168.12.0 255.255.255.0 area 0
R2(config-router)#area 0 authentication
R2(config)#interface s0/0/0
R2(config-if)#ip ospf authentication-key cisco
4.实验调试
（1）show ip ospf interface
R1#show ip ospf interface s0/0/0
Serial0/0/0 is up, line protocol is up
Internet Address 192.168.12.1/24, Area 0
Process ID 1, Router ID 1.1.1 .1, Network Type POINT_TO_POINT, Cost: 781
Transmit Delay is 1 sec, State POINT_TO_POINT
Timer intervals configured, Hello 10, Dead 40, Wait 40, Retransmit 5
oob-resync timeout 40
Hello due in 00:00:02
Supports Link-local Signaling (LLS)
Cisco NSF helper support enabled
IETF NSF helper support enabled
Index 1/1, flood queue length 0
Next 0x0(0)/0x0(0)
Last flood scan length is 0, maximum is 1
Last flood scan time is 0 msec, maximum is 0 msec
Neighbor Count is 0, Adjacent neighbor count is 0
Suppress hello for 0 neighbor(s)
Simple password authentication enabled
以上输出最后一行信息表明该接口启用了简单口令认证。
（2）show ip ospf
R1#show ip ospf
Routing Process "ospf 1" with ID 1.1.1 .1
Supports only single TOS(TOS0) routes
......
Area BACKBONE(0)
Number of interfaces in this area is 2 (1 loopback)
Area has simple password authentication
SPF algorithm last executed 00:00:01.916 ago
SPF algorithm executed 5 times
Area ranges are
Number of LSA 2. Checksum Sum 0x010117
Number of opaque link LSA 0. Checksum Sum 0x000000
Number of DCbitless LSA 0
Number of indication LSA 0
Number of DoNotAge LSA 0
Flood list length 0
以上输出表明区域0 采用简单口令认证。
（3）如果R1 区域0 没有启动认证，而R2 区域0 启动简单口令认证，则R2 上出现下面
的信息：
*Feb 10 11:03:03.071: OSPF: Rcv pkt from 192.168.12.1, Serial0/0/0 : Mismatch
Authentication type. Input packet specified type 0, we use type 1
（4）如果R1 和R2 的区域0 都启动简单口令认证，但是R2 的接口下没有配置密码或密
码错误，则R2 上出现下面的信息：
*Feb 10 10:55:53.071: OSPF: Rcv pkt from 192.168.12.1, Serial0/0/0 : Mismatch
Authentication Key - Clear Text