三层交换机配置DHCP中继
实验目的：
通过本实验掌握如何给不同网段配置DHCP，掌握DHCP中继配置。
实验拓扑：
对交换机SW1进行预配置。
Switch>enSwitch#conf tEnter configuration commands, one per line. End with CNTL/Z.Switch(config)#no ip domain-lookupSwitch(config)#line con 0Switch(config-line)#no exec-tSwitch(config-line)#logg synSwitch(config-line)#host SW1
//划分vlan，配置接口的ip地址（配置IP地址可以不使用VLAN，可以通过在端口敲no switchport命令进行配置，这里为了检验学习成果，故使用）。
SW1(config)#vlan 100SW1(config-vlan)#int f0/1SW1(config-if)#switchport mode access SW1(config-if)#switchport access vlan 100SW1(config-if)#spanning-tree portfast SW1(config)#vlan 200SW1(config-vlan)#int f0/2SW1(config-if)#switchport mode access SW1(config-if)#switchport access vlan 200SW1(config-if)#spanning-tree portfast SW1(config-if)#int Vlan100SW1(config-if)#ip address 12.0.0.1 255.255.255.0SW1(config-if)#interface Vlan200SW1(config-if)# ip address 192.168.1.1 255.255.255.0//配置远程登录的用户名和密码，如果用户的级别为15，远程登录之后可以直接进入特权模式SW1(config)#username admin privilege 15 password 0 adminSW1(config)#line vty 0 4SW1(config-line)# login local
对交换机SW2进行预配置
Switch>enSwitch#conf tEnter configuration commands, one per line. End with CNTL/Z.Switch(config)#no ip domain-lookupSwitch(config)#line con 0Switch(config-line)#no exec-tSwitch(config-line)#logg synSwitch(config-line)#host SW2
//划分vlan，配置接口的ip地址。
SW2(config)#vlan 100SW2(config-vlan)#int f0/1SW2(config-if)#switchport mode access SW2(config-if)#switchport access vlan 100SW2(config-if)#spanning-tree portfast SW2(config)#vlan 200SW2(config-vlan)#int f0/2SW2(config-if)#switchport mode access SW2(config-if)#switchport access vlan 200SW2(config-if)#spanning-tree portfast SW2(config-if)#int Vlan100SW2(config-if)#ip address 12.0.0.2 255.255.255.0SW2(config-if)#interface Vlan200SW2(config-if)# ip address 172.16.1.1 255.255.255.0//配置远程登录的用户名和密码，如果用户的级别为15，远程登录之后可以直接进入特权模式SW2(config)#username admin privilege 15 password 0 adminSW2(config)#line vty 0 4SW2(config-line)#login local
在SW1运行动态路由协议，配置DHCP
//配置动态路由协议，保证两个不同的网段可以相互通信
//提示未开启ip routing，把它打开就好了SW1(config)#router ripIP routing not enabled
SW1(config)#ip routing SW1(config)#router ripSW1(config-router)#version 2SW1(config-router)#no auto-summary SW1(config-router)#network 12.0.0.1SW1(config-router)#network 192.168.1.1SW1(config-router)#exit
//开启DHCP服务
SW1(config)#service dhcp SW1(config)#ip dhcp pool PC1_SubnetSW1(dhcp-config)# network 192.168.1.0 255.255.255.0SW1(dhcp-config)# default-router 192.168.1.1SW1(dhcp-config)# option 150 ip 192.168.1.10SW1(dhcp-config)# dns-server 61.134.1.4SW1(dhcp-config)# domain-name SW1(dhcp-config)#exitSW1(config)#ip dhcp excluded-address 192.168.1.1SW1(config)#ip dhcp excluded-address 192.168.1.10SW1(config)#ip dhcp pool PC2_SubnetSW1(dhcp-config)#network 172.16.1.0 255.255.255.0SW1(dhcp-config)#default-router 172.16.1.1SW1(dhcp-config)#option 150 ip 172.16.1.10SW1(dhcp-config)#dns-server 61.134.1.4SW1(dhcp-config)#domain-name SW1(config)#ip dhcp excluded-address 172.16.1.1SW1(config)#ip dhcp excluded-address 172.16.1.10
在SW2运行动态路由协议，配置辅助地址
SW1#telnet 12.0.0.2Trying 12.0.0.2 ...OpenUser Access VerificationUsername: adminPassword: SW2#conf tEnter configuration commands, one per line. End with CNTL/Z.SW2(config)#SW2(config)#router ripIP routing not enabledSW2(config)#ip routingSW2(config)#router ripSW2(config-router)#version 2SW2(config-router)#no auto-summary SW2(config-router)#network 12.0.0.2SW2(config-router)#network 172.16.1.1
//配置DHCP中继地址
SW2(config-if)#int vlan 200SW2(config-if)#ip helper-address 12.0.0.1
SW1#show ip int brief Vlan10012.0.0.1 YES manual upup Vlan200192.168.1.1YES manual upup
在PC1和PC2上查看获得IP地址信息
首先需要在电脑上点击DHCP获取IP。
PC1:
PC2:
查看交换机IP地址池和动态绑定信息
SW1#show ip dhcp binding IP address Client-ID/ Lease expiration TypeHardware address192.168.1.2000A.41C6.02DC -- Automatic172.16.1.2 0003.E40B.96D3 -- Automatic
SW1#show ip route Codes: C - connected, S - static, I - IGRP, 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 set12.0.0.0/24 is subnetted, 1 subnetsC 12.0.0.0 is directly connected, Vlan100172.16.0.0/24 is subnetted, 1 subnetsR 172.16.1.0 [120/1] via 12.0.0.2, 00:00:14, Vlan100C 192.168.1.0/24 is directly connected, Vlan200
测试全网互联互通。
SW1#ping 172.16.1.2Type escape sequence to abort.Sending 5, 100-byte ICMP Echos to 172.16.1.2, timeout is 2 seconds:.!!!!Success rate is 80 percent (4/5), round-trip min/avg/max = 0/0/1 ms
发现主机1能ping通主机2,说明可以全网互通。
