DHCPRelay（DHCPR）DHCP中继 也叫做DHCP中继代理，如果DHCP客户机与DHCP服务器在同一个物理网段，则客户机可以正确地获得动态分配的ip地址。如果不在同一个物理网段，则需要DHCP Relay Agent(中继代理)。用DHCP Relay代理可以去掉在每个物理的网段都要有DHCP服务器的必要,它可以传递消息到不在同一个物理子网的DHCP服务器，也可以将服务器的消息传回给不在同一个物理子网的DHCP客户机。

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实验需求：

• C1、C2、C3属于不同的VLAN，分别是VLAN10,20,30;

• 三层交换实现PC间互通，并通过dhcp中继代理在R2获取IP地址;

• R2开启dhcp服务为PC分配IP地址;

实验步骤:

实验所用 ：HUAWEI eNsp

1.LSW2交换机 批量添加VLAN 10,20  配置 Ethernet 0/0/3 VLAN 10 让PC1属于VLAN10; 配置Ethernet 0/0/4 PC2属于VLAN20  配置Ethernet 0/0/2 中继TRUNK口;

sy  //特权模式;

Enter system view, return user view with Ctrl+Z.

[Huawei]vlan bat 10 20  //批量添加VLAN10,20;

Info: This operation may take a few seconds. Please wait for a moment...done.

Mar 31 2016 19:12:26-08:00 Huawei DS/4/DATASYNC_CFGCHANGE:OID 1.3.6.1.4.1.2011.5

.25.191.3.1 configurations have been changed. The current change number is 4, th

e change loop count is 0, and the maximum number of records is 4095.

[Huawei]int e0/0/3  //进GigabitEthernet0/0/3物理接口;

[Huawei-Ethernet0/0/3]port link-type access   //设置为访问口;

[Huawei-Ethernet0/0/3]port default vlan 10    //添加为VLAN10;

[Huawei-Ethernet0/0/3]int e0/0/4    //进GigabitEthernet0/0/4物理接口;

[Huawei-Ethernet0/0/4]port link-type access   //设置为访问口;

[Huawei-Ethernet0/0/4]port default vlan 20    //添加为VLAN20;

[Huawei-Ethernet0/0/4]int e0/0/2   //进GigabitEthernet0/0/2物理接口;

[Huawei-Ethernet0/0/2]port link-type trunk    //设置为中继TRUNK口;

[Huawei-Ethernet0/0/2]port trunk allow-pass vlan 10 20   //允许VLAN10,20成员的流量通过;

2.LSW1批量添加VLAN10,20  配置VLAN10,20,30 IP地址为PC的网关地址及子网掩码  添加VLAN100 为GigabitEthernet0/0/1 设置IP地址实现上口互联  设置静态路由所有IP地址转发到10.0.0.2 开启dhcp功能并设置dhcp中继;

sy   //特权模式;

[Huawei]vlan bat 10 20  //批量添加VLAN10,20;

Info: This operation may take a few seconds. Please wait for a moment...done.

[Huawei]int vlan 10   //进VLAN10接口;

[Huawei-Vlanif10]ip add 192.168.1.1 24  //配置IP地址及子网掩码;

[Huawei-Vlanif10]q

[Huawei]int vlan 20   //进VLAN20接口;

[Huawei-Vlanif20]

Mar 31 2016 19:18:31-08:00 Huawei %%01IFNET/4/IF_STATE(l)[3]:Interface Vlanif20

has turned into UP state.

[Huawei-Vlanif20]ip add 192.168.2.1 24  //配置IP地址、子网掩码;

[Huawei-Vlanif20]q

[Huawei]int vlan 30  //进VLAN30接口;

[Huawei-Vlanif30]

Mar 31 2016 19:18:48-08:00 Huawei %%01IFNET/4/IF_STATE(l)[5]:Interface Vlanif30

has turned into UP state.

[Huawei-Vlanif30]ip add 192.168.3.1 24  //配置IP地址、子网掩码;

[Huawei-Vlanif30]

Mar 31 2016 19:18:55-08:00 Huawei %%01IFNET/4/LINK_STATE(l)[6]:The line protocol

 IP on the interface Vlanif30 has entered the UP state.

[Huawei]vlan 100  //创建VLAN100;

[Huawei-vlan100]int vlan 100   //进VLAN100接口;

[Huawei-Vlanif100]ip add 10.0.0.1 24  //配置IP地址及子网掩码;

[Huawei]int g0/0/1  //进GigabitEthernet0/0/1物理接口;

[Huawei-GigabitEthernet0/0/1]port link-type access  //设置接口类型为访问口;

[Huawei-GigabitEthernet0/0/1]port default vlan 100  //添加进VLAN100;

[Huawei-GigabitEthernet0/0/1]q

[Huawei]ip route-static 0.0.0.0 0.0.0.0 10.0.0.2   //配置静态路由;

[Huawei]q

ping 12.0.0.3   //测试上层互通性;

 PING 12.0.0.3: 56  data bytes, press CTRL_C to break

  Request time out

  Reply from 12.0.0.3: bytes=56 Sequence=2 ttl=254 time=130 ms

  Reply from 12.0.0.3: bytes=56 Sequence=3 ttl=254 time=40 ms

  Reply from 12.0.0.3: bytes=56 Sequence=4 ttl=254 time=20 ms

  Reply from 12.0.0.3: bytes=56 Sequence=5 ttl=254 time=60 ms

[Huawei]dhcp enable  //开启dhcp服务;

Info: The operation may take a few seconds. Please wait for a moment.done.

[Huawei]int vlan 10   //进VLAN10接口;

[Huawei-Vlanif10]dhcp select relay  //配置dhcp中继;

[Huawei-Vlanif10]dhcp relay server-ip 12.0.0.3  //设置dhcp中继服务端地址;

[Huawei-Vlanif10]int vlan 20   //进VLAN20接口;

[Huawei-Vlanif20]dhcp select relay  //配置dhcp中继;

[Huawei-Vlanif20]dhcp relay server-ip 12.0.0.3  //设置dhcp中继服务端地址;

[Huawei-Vlanif20]int vlan 30   //进VLAN30接口;

[Huawei-Vlanif30]dhcp select relay  //配置dhcp中继;

[Huawei-Vlanif30]dhcp relay server-ip 12.0.0.3   //设置dhcp中继服务端地址;

3.路由器AR1配置GigabitEthernet0/0/1 、GigabitEthernet0/0/0 IP地址   设置静态路由实现网络互通;

sy  //特权模式;

Enter system view, return user view with Ctrl+Z.

[Huawei]int g0/0/1  //进物理接口GigabitEthernet0/0/1;

[Huawei-GigabitEthernet0/0/1]ip add 10.0.0.2 24   //配置IP地址及子网掩码;

Mar 31 2016 19:19:58-08:00 Huawei %%01IFNET/4/LINK_STATE(l)[0]:The line protocol

 IP on the interface GigabitEthernet0/0/1 has entered the UP state.

[Huawei]int g0/0/0  //进接口GigabitEthernet0/0/0;

[Huawei-GigabitEthernet0/0/0]ip add 12.0.0.2 24  //配置IP地址及子网掩码;

[Huawei-GigabitEthernet0/0/0]q

[Huawei]ip route-static 0.0.0.0 0.0.0.0 12.0.0.3  //配置静态路由;

[Huawei]ip route-static 192.168.1.0 255.255.255.0 10.0.0.1

[Huawei]ip route-static 192.168.2.0 255.255.255.0 10.0.0.1

[Huawei]ip route-static 192.168.3.0 255.255.255.0 10.0.0.1

4.路由器AR2配置GigabitEthernet0/0/0 IP地址  配置v10、v20、v30 dhcp服务端为PC分配IP地址、网关、DNS  配置静态路由实现网络互通  进接口GigabitEthernet0/0/0选择全局的地址池给DHCP客户端使用;

sy  //特权模式;

Enter system view, return user view with Ctrl+Z.

[Huawei]int g0/0/0   //进物理接口GigabitEthernet0/0/0;

[Huawei-GigabitEthernet0/0/0]ip add 12.0.0.3 24   //配置IP地址及子网掩码;

Mar 31 2016 19:21:30-08:00 Huawei %%01IFNET/4/LINK_STATE(l)[0]:The line protocol

 IP on the interface GigabitEthernet0/0/0 has entered the UP state.

[Huawei-GigabitEthernet0/0/0]q  //退出;

[Huawei]ip pool v10    //建立v10地址池;

Info: It's successful to create an IP address pool.

[Huawei-ip-pool-v10]network 192.168.1.0 mask 24   //网络段及子网掩码;

[Huawei-ip-pool-v10]gateway-list 192.168.1.1     //网关地址;

[Huawei-ip-pool-v10]dns-list 2.2.2.2 4.4.4.4     //DNS地址;

[Huawei-ip-pool-v10]q

[Huawei]ip pool v20    //建立v20地址池;

Info: It's successful to create an IP address pool.

[Huawei-ip-pool-v20]network 192.168.2.0 mask 24   //网络段及子网掩码;

[Huawei-ip-pool-v20]gateway-list 192.168.2.1    //网关地址;

[Huawei-ip-pool-v20]dns-list 2.2.2.2        // DNS地址;

[Huawei-ip-pool-v20]q

[Huawei]ip pool v30    //建立v30地址池;

Info: It's successful to create an IP address pool.

[Huawei-ip-pool-v30]network 192.168.3.0 mask 24  //网络段及子网掩码;

[Huawei-ip-pool-v30]gateway-list 192.168.3.1    //网关地址;

[Huawei-ip-pool-v30]dns-list 2.2.2.2        // DNS地址;

[Huawei-ip-pool-v30]q

[Huawei]ip route-static 0.0.0.0 0.0.0.0 12.0.0.2  //设置静态路由;

[Huawei]dhcp enable    //开启dhcp功能;

Info: The operation may take a few seconds. Please wait for a moment.done.

[Huawei]int g0/0/0    //进物理接口GigabitEthernet0/0/0;

[Huawei-GigabitEthernet0/0/0]dhcp select global  //dhcp选择全局地址池;

5.测试PC正常获取IP地址、子网掩码、DNS等信息  测试全网互通;

PC>ipconfig  //PC1获取IP地址、子网掩码、DNS等信息;

Link local IPv6 address...........: fe80::5689:98ff:fe2e:78f6

IPv6 address......................: :: / 128

IPv6 gateway......................: ::

IPv4 address......................: 192.168.1.254

Subnet mask.......................: 255.255.255.0

Gateway...........................: 192.168.1.1

Physical address..................: 54-89-98-2E-78-F6

DNS server........................: 2.2.2.2

                  4.4.4.4

PC>ipconfig   //PC2获取IP地址、子网掩码、DNS等信息;

Link local IPv6 address...........: fe80::5689:98ff:fe5b:5969

IPv6 address......................: :: / 128

IPv6 gateway......................: ::

IPv4 address......................: 192.168.2.254

Subnet mask.......................: 255.255.255.0

Gateway...........................: 192.168.2.1

Physical address..................: 54-89-98-5B-59-69

DNS server........................: 2.2.2.2

PC>ipconfig   //PC3获取IP地址、子网掩码、DNS等信息;

Link local IPv6 address...........: fe80::5689:98ff:fef1:2fe4

IPv6 address......................: :: / 128

IPv6 gateway......................: ::

IPv4 address......................: 192.168.3.254

Subnet mask.......................: 255.255.255.0

Gateway...........................: 192.168.3.1

Physical address..................: 54-89-98-F1-2F-E4

DNS server........................: 2.2.2.2

PC>ping 192.168.3.254   //测试PC1、PC3连通性;

Ping 192.168.3.254: 32 data bytes, Press Ctrl_C to break

Request timeout!

From 192.168.3.254: bytes=32 seq=2 ttl=127 time=78 ms

From 192.168.3.254: bytes=32 seq=3 ttl=127 time=78 ms

From 192.168.3.254: bytes=32 seq=4 ttl=127 time=47 ms

PC>ping 12.0.0.3  //测试PC1、AR2连通性;

Ping 12.0.0.3: 32 data bytes, Press Ctrl_C to break

From 12.0.0.3: bytes=32 seq=1 ttl=253 time=32 ms

From 12.0.0.3: bytes=32 seq=2 ttl=253 time=32 ms

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