在相对较小而且结构不变的网络中，静态路由是很好的解决方案，它配置简单而且不过多消耗设备资源（动态路由协议在运行时要消耗路由器内部资源，在与其他路由器更新信息时又会消耗网络资源）。
然而在大型网络中，网络非常多，而且很有可能因为某些因素的影响，网络拓扑会有轻微变化。这时如果仍然采用静态路由就非常不方便了。
1)通过RIP实现路由间通信
动态路由协议配置灵活，路由器会发送自身的路由信息给其他路由器，同时也会接收其他路由器发来的路由信息建立自己的路由表。这样在路由器上就不必像静态路由那样为每个目标地址都配置路由，因为路由器可以通过协议学习这些路由。网络拓扑改变，路由信息也会自动更新，无需管理员干预。
网络拓扑如图
实现此案例需要按照如下步骤进行。
步骤一：VLAN以及端口配置与上面3三层交换配置路由完全一致，不再赘述配置
步骤二：将上面【1.3在三层交换机上配置路由】中的静态、默认路由删除
tarenasw-3L(config)#no ip route 0.0.0.0 0.0.0.0 192.168.10.1 tarena-rouer(config)#no ip route 192.168.1.0 255.255.255.0 192.168.10.2 tarena-rouer(config)#no ip route 192.168.2.0 255.255.255.0 192.168.10.2 tarena-rouer(config)#no ip route 192.168.3.0 255.255.255.0 192.168.10.2步骤三：分别在三层交换机和路由器上配置RIP路由协议
RIP路由协议在配置network时，只需要配置该路由器所直连的主类网络，不与该路由器直连的网络不需要包含在network中。
RIP默认工作在第一版本下，但是RIP-V1是有类路由协议，而且通过广播的方式进行路由更新，无论是功能上还是效率上都有一些缺陷，这些缺陷RIP-V2可以弥补。在使用时建议采用RIP-V2而不是RIP-V1。
tarenasw-3L(config)#router rip tarenasw-3L(config-router)#version 2 tarenasw-3L(config-router)#no auto-summary tarenasw-3L(config-router)#network 192.168.1.0 tarenasw-3L(config-router)#network 192.168.2.0 tarenasw-3L(config-router)#network 192.168.3.0 tarenasw-3L(config-router)#network 192.168.10.0 tarena-rouer(config)#router rip tarena-rouer(config-router)#version 2 tarena-rouer(config-router)#network 192.168.10.0 tarena-rouer(config-router)#network 200.1.1.0步骤四：分别在三层交换机和路由器上查看路由表
注意以R开头的路由，这些路由表示通过RIP协议从其他运行RIP的路由器学习过来的路由。每条路由都写明了目标网络、下一跳IP地址以及从自己哪个端口发出去。
tarenasw-3L#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, 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 192.168.1.0/24 is directly connected, Vlan1
C 192.168.2.0/24 is directly connected, Vlan2
C 192.168.3.0/24 is directly connected, Vlan3
C 192.168.10.0/24 is directly connected, FastEthernet0/23
R 200.1.1.0/24 [120/1] via 192.168.10.1, 00:00:07, FastEthernet0/23
tarena-rouer#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, 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
R 192.168.1.0/24 [120/1] via 192.168.10.2, 00:00:10, FastEthernet0/0
R 192.168.2.0/24 [120/1] via 192.168.10.2, 00:00:10, FastEthernet0/0
R 192.168.3.0/24 [120/1] via 192.168.10.2, 00:00:10, FastEthernet0/0
C 192.168.10.0/24 is directly connected, FastEthernet0/0
C 200.1.1.0/24 is directly connected, FastEthernet0/1
步骤五：在Server上测试到三个VLAN中主机的通信
SERVER>ipconfig FastEthernet0 Connection:(default port) Link-local IPv6 Address.........: FE80::2E0:8FFF:FE14:BB43 IP Address......................: 200.1.1.10 Subnet Mask.....................: 255.255.255.0 Default Gateway.................: 200.1.1.1 SERVER>ping 192.168.1.10 Pinging 192.168.1.10 with 32 bytes of data: Reply from 192.168.1.10: bytes=32 time=0ms TTL=126 Reply from 192.168.1.10: bytes=32 time=0ms TTL=126 Reply from 192.168.1.10: bytes=32 time=0ms TTL=126 Reply from 192.168.1.10: bytes=32 time=1ms TTL=126 Ping statistics for 192.168.1.10: Packets: Sent = 4, Received = 3, Lost = 1 (25% loss), Approximate round trip times in milli-seconds: Minimum = 0ms, Maximum = 1ms, Average = 0ms SERVER>ping 192.168.2.10 Pinging 192.168.2.10 with 32 bytes of data: Reply from 192.168.2.10: bytes=32 time=0ms TTL=126 Reply from 192.168.2.10: bytes=32 time=0ms TTL=126 Reply from 192.168.2.10: bytes=32 time=0ms TTL=126 Reply from 192.168.2.10: bytes=32 time=0ms TTL=126 Ping statistics for 192.168.2.10: Packets: Sent = 4, Received = 4, Lost = 0 (0% loss), Approximate round trip times in milli-seconds: Minimum = 0ms, Maximum = 0ms, Average = 0ms SERVER>ping 192.168.3.10 Pinging 192.168.3.10 with 32 bytes of data: Reply from 192.168.3.10: bytes=32 time=1ms TTL=126 Reply from 192.168.3.10: bytes=32 time=0ms TTL=126 Reply from 192.168.3.10: bytes=32 time=0ms TTL=126 Reply from 192.168.3.10: bytes=32 time=0ms TTL=126 Ping statistics for 192.168.3.10: Packets: Sent = 4, Received = 4, Lost = 0 (0% loss), Approximate round trip times in milli-seconds: Minimum = 0ms, Maximum = 1ms, Average = 0ms SERVER> 31% /misc/nfsdir