概述:
RIP 协议,是一个距离矢量路由协议,采用跳数作为到达目的网络的度量标识,最大跳数为16 跳,即大于等于16 跳网络即为不可达。目前有RIP V1 和RIP V2 两个版本。由于最大跳数的限制,以及协议的其他原因,RIP 协议不适合用于大型网络。
路由安装疑难:
缺失的路由条目-子网掩码不一致:

如图2,在路由器上R1 R2 R3 配置运行RIP 协议,却发现R2 和R3 缺失路由条目。
R1:
interface Serial0/0
link-protocol ppp
ip address 10.0.0.1 255.255.255.0
#
interface Serial2/0
link-protocol ppp
ip address 10.1.0.1 255.255.255.252
#
interface LoopBack0
ip address 10.1.1.1 255.255.255.252
#
interface LoopBack1
ip address 10.0.1.1 255.255.255.0
#
rip
network 0.0.0.0
R2:
interface Serial0/0
clock DTECLK1
link-protocol ppp
ip address 10.0.0.2 255.255.255.0
#
interface Serial3/0
link-protocol ppp
#
rip
network 0.0.0.0
R3:
interface Serial0/0
clock DTECLK1
link-protocol ppp
ip address 10.1.0.2 255.255.255.252
#
rip
network 0.0.0.0
故障排除:查看R2 R3 的路由表,缺少部分路由条目:
[R2]dis rip routing
RIP routing table: public net
A = Active I = Inactive G = Garbage collection
C = Change T = Trigger RIP
Destination/Mask Cost NextHop Age SourceGateway Att
10.0.1.0/24 1 10.0.0.1 25s 10.0.0.1 A
[R3]dis rip routing
RIP routing table: public net
A = Active I = Inactive G = Garbage collection
C = Change T = Trigger RIP
Destination/Mask Cost NextHop Age SourceGateway Att
10.1.1.0/30 1 10.1.0.1 13s 10.1.0.1 A
经检查发现,网络规划时使用不一致的子网掩码,这对于RIPV1 来说是错误的配置。要么
修正网络掩码,要么采用RIPV2 协议,此处是采用RIPV2 协议的配置:
R1:
interface Serial0/0
link-protocol ppp
ip address 10.0.0.1 255.255.255.0
rip version 2 multicast
#
interface Serial2/0
link-protocol ppp
ip address 10.1.0.1 255.255.255.252
rip version 2 multicast
R2:
interface Serial0/0
clock DTECLK1
link-protocol ppp
ip address 10.0.0.2 255.255.255.0
rip version 2 multicast
R3:
interface Serial0/0
clock DTECLK1
link-protocol ppp
ip address 10.1.0.2 255.255.255.252
rip version 2 multicast
原文链接:http://bbs.chinaunix.net/viewthread.php?tid=1083378
转载请注明作者名及原文出处
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