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1、在做rip的实验应该是轻车熟路了，配置三个路由器，配置串行接口，互联这些设备，做IP地址和掩码的配置。做no classless设置。
2、启动rip路由协议，因为ripv1是有类的路由协议，而且它会自动做路由汇总，汇总成ABC类的网段，所以它会认为拓扑图中的lo口的两个IP是一个类的，自然会出现问题，所以当配置好rip后，在R2上看路由表会是这样的情况：
R2#show ip route
Codes: C - connected, S - static, I - IGRP, 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, E - EGP
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
172.16.0.0/24 is subnetted, 2 subnets
C 172.16.1.0 is directly connected, Serial0/0
C 172.16.2.0 is directly connected, Serial0/1
R 10.0.0.0/8 [120/1] via 172.16.1.1, 00:00:12, Serial0/0
[120/1] via 172.16.2.2, 00:00:09, Serial0/1
3、这个时候在R2上pingR1的lo口，或者是pingR3的lo口，都会是一半通一半不通。
R2#ping 10.1.1.1
Type escape sequence to abort.
Sending 5, 100-byte ICMP Echos to 10.1.1.1, timeout is 2 seconds:
U!.!U
Success rate is 40 percent (2/5), round-trip min/avg/max = 8/8/8 ms
R2#ping 10.1.1.1
4、要解决这个办法，我打上no auto-summary是不能解决问题的，因为ripv1对这个命令是没有意义的。我们需要先升级到ripv2版本。这是在看路由表是这样的
R2#show ip route
Codes: C - connected, S - static, I - IGRP, 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, E - EGP
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 http://www.luyouqiwang.com/13829/ last resort is not set
172.16.0.0/24 is subnetted, 2 subnets
C 172.16.1.0 is directly connected, Serial0/0
C 172.16.2.0 is directly connected, Serial0/1
10.0.0.0/8 is variably subnetted, 3 subnets, 2 masks
R 10.1.2.0/24 [120/1] via 172.16.2.2, 00:00:07, Serial0/1
R 10.1.1.0/24 [120/1] via 172.16.1.1, 00:00:04, Serial0/0
R 10.0.0.0/8 [120/1] via 172.16.1.1, 00:02:20, Serial0/0
[120/1] via 172.16.2.2, 00:01:59, Serial0/15、这是再ping就能ping通了。
R2#ping 10.1.1.1
Type escape sequence to abort.
Sending 5, 100-byte ICMP Echos to 10.1.1.1, timeout is 2 seconds:
!!!!!
Success rate is 100 percent (5/5), round-trip min/avg/max = 8/12/20 ms
R2#ping 10.1.2.1
Type escape sequence to abort.
Sending 5, 100-byte ICMP Echos to 10.1.2.1, timeout is 2 seconds:
!!!!!
Success rate is 100 percent (5/5), round-trip min/avg/max = 8/16/28 ms |
