思科实验4.网络层：路由器IP地址配置

路由器IP地址配置

基础知识
常用命令
实验流程
- 1.设计拓扑
- 2.配置路由器IP地址
- 3.查看路由表
- 4.激活端口
- 5.查看路由表
- 6.验证主机连通

基础知识

ip地址是网络层中使用的地址，网络层依靠IP地址和路由协议将数据报送到目的IP主机。

路由器是互联网的核心设备，它在IP网络间转发数据报，这使得路由器的每个接口都连接一个或多个网络，而两个接口却不可以代表一个网络，路由器的一个配置了IP地址的接口所在的网络就是路由器的直连网络，路由器不需要额外的配置路由，当接口被激活后，路由器就会自动将直连网络加入到路由表中。

常用命令

命令格式	含义
ip address IP地址子网掩码	在接口模式下配置当前接口的IP地址
show ip route	特权模式下查看路由器的路由表
do show ip route	非特权模式下查看路由表
no shutdown	接口模式下激活该接口

实验流程

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开始

设计拓扑

配置ip

未激活情况下查看路由表

激活情况下查看路由表

验证主机连通

结束

1.设计拓扑

2.配置路由器IP地址

Router>enable
Router#configure terminal
Enter configuration commands, one per line.  End with CNTL/Z.
Router(config)#interface g0/0
Router(config-if)#ip address 192.168.1.1 255.255.255.0
Router(config-if)#exit
Router(config)#interface g0/1
Router(config-if)#ip address 192.168.2.1 255.255.255.0
Router(config-if)#end
Router#
%SYS-5-CONFIG_I: Configured from console by consoleRouter#

3.查看路由表

Router#show ip route
Codes: L - local, C - connected, S - static, R - RIP, M - mobile, B - BGPD - EIGRP, EX - EIGRP external, O - OSPF, IA - OSPF inter areaN1 - OSPF NSSA external type 1, N2 - OSPF NSSA external type 2E1 - OSPF external type 1, E2 - OSPF external type 2, E - EGPi - 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 - ODRP - periodic downloaded static routeGateway of last resort is not set

4.激活端口

Router#configure terminal
Enter configuration commands, one per line.  End with CNTL/Z.
Router(config)#interface g0/0
Router(config-if)#no shutdownRouter(config-if)#
%LINK-5-CHANGED: Interface GigabitEthernet0/0, changed state to up%LINEPROTO-5-UPDOWN: Line protocol on Interface GigabitEthernet0/0, changed state to upRouter(config-if)#exit
Router(config)#interface g0/1
Router(config-if)#no shutdownRouter(config-if)#
%LINK-5-CHANGED: Interface GigabitEthernet0/1, changed state to up%LINEPROTO-5-UPDOWN: Line protocol on Interface GigabitEthernet0/1, changed state to upRouter(config-if)#

5.查看路由表

Router#show ip route
Codes: L - local, C - connected, S - static, R - RIP, M - mobile, B - BGPD - EIGRP, EX - EIGRP external, O - OSPF, IA - OSPF inter areaN1 - OSPF NSSA external type 1, N2 - OSPF NSSA external type 2E1 - OSPF external type 1, E2 - OSPF external type 2, E - EGPi - 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 - ODRP - periodic downloaded static routeGateway of last resort is not set192.168.1.0/24 is variably subnetted, 2 subnets, 2 masks
C       192.168.1.0/24 is directly connected, GigabitEthernet0/0
L       192.168.1.1/32 is directly connected, GigabitEthernet0/0192.168.2.0/24 is variably subnetted, 2 subnets, 2 masks
C       192.168.2.0/24 is directly connected, GigabitEthernet0/1
L       192.168.2.1/32 is directly connected, GigabitEthernet0/1

6.验证主机连通

这里验证p0和p2的连通性，打开主机p0终端

C:\>ping 192.168.2.11Pinging 192.168.2.11 with 32 bytes of data:Request timed out.
Request timed out.
Request timed out.
Request timed out.Ping statistics for 192.168.2.11:Packets: Sent = 4, Received = 0, Lost = 4 (100% loss)
C:\>

等等，忘记配置每个主机的IP，子网掩码，网关了

再来

C:\>ping 192.168.2.11Pinging 192.168.2.11 with 32 bytes of data:Request timed out.
Reply from 192.168.2.11: bytes=32 time<1ms TTL=127
Reply from 192.168.2.11: bytes=32 time<1ms TTL=127
Reply from 192.168.2.11: bytes=32 time=1ms TTL=127Ping statistics for 192.168.2.11:Packets: Sent = 4, Received = 3, Lost = 1 (25% loss),
Approximate round trip times in milli-seconds:Minimum = 0ms, Maximum = 1ms, Average = 0msC:\>

已经可以证明两者可以互相通信了，其它的同样也可以就不做验证了。

此时再看一下拓扑图

之前的红点已经变成了绿色。

绿色：代表连通
红色：代表未连接
黄色：代表阻塞

注意：路由器端口所连接的不能是同一个网络，否者会出现端口重叠的现象。