DHCP RELAY实验（华为） 拓补案例： 某个公司有三个部门，A,B,C, 企业拓补结构是， AR华为路由器+S5700核心交换机，下面接S3700汇聚交换机，汇聚交换机下面接PC 要求PC端从全局获取IP地址，方式是dhcp relay，三个地址池分别是VLAN10,20,30

请看拓补

R1配置：

[router]display current-configuration //显示用户配置
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sysname router//命名为：router
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undo info-center enable//关闭配置改变信息提示
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dhcp enable//开启DHCP服务
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ip pool vlan10//创建名为vlan10的地址池
 gateway-list 192.168.10.254//网关
 network 192.168.10.0 mask 255.255.255.0//网络地址和子网掩码
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ip pool vlan20//创建名为vlan20的地址池
 gateway-list 192.168.20.254
 network 192.168.20.0 mask 255.255.255.0
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ip pool vlan30
 gateway-list 192.168.30.254
 network 192.168.30.0 mask 255.255.255.0
#
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interface Vlanif1
 ip address 192.168.1.1 255.255.255.0
 dhcp select global//dhcp获取方式为全局获取AP地址
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ip route-static 192.168.10.0 255.255.255.0 192.168.1.2//静态路由，格式是，目标地址+子网掩码+下一跳地址
ip route-static 192.168.20.0 255.255.255.0 192.168.1.2
ip route-static 192.168.30.0 255.255.255.0 192.168.1.2
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LSW1配置：

[S1]display current-configuration 
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sysname S1
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undo info-center enable
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vlan batch 10 20 30//创建vlan 10 20 30
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dhcp enable
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interface Vlanif1
 ip address 192.168.1.2 255.255.255.0
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interface Vlanif10
 ip address 192.168.10.254 255.255.255.0
 dhcp select relay//获取DHCP的方式是dhcp 中继
 dhcp relay server-ip 192.168.1.1
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interface Vlanif20
 ip address 192.168.20.254 255.255.255.0
 dhcp select relay
 dhcp relay server-ip 192.168.1.1
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interface Vlanif30
 ip address 192.168.30.254 255.255.255.0
 dhcp select relay
 dhcp relay server-ip 192.168.1.1
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interface GigabitEthernet0/0/1
 port link-type trunk
 port trunk allow-pass vlan 10 20
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interface GigabitEthernet0/0/2
 port link-type trunk
 port trunk allow-pass vlan 10 30
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ip route-static 0.0.0.0 0.0.0.0 192.168.1.1//配置一条默认路由，当目标地址此交换机的路由表匹配上的时候，默认用这条路由转发数据包（匹配原则，1：假设目标IP地址为X，路由条目里面的IP/掩码是Y/Z，如果X和Z相与的结果等于Y，那么就会按此路由转发，当有两条以上的匹配上之后，优先选择掩码最长的转发）
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LSW2配置

[Huawei]display current-configuration 
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sysname Huawei
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undo info-center enable
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vlan batch 10 20
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interface Ethernet0/0/1
 port link-type access
 port default vlan 10
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interface Ethernet0/0/2
 port link-type access
 port default vlan 20
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interface GigabitEthernet0/0/1
 port link-type trunk
 port trunk allow-pass vlan 10 20
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LSW3配置

[Huawei]display current-configuration 
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sysname Huawei
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undo info-center enable
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vlan batch 10 30
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interface Ethernet0/0/1
 port link-type access
 port default vlan 10
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interface Ethernet0/0/2
 port link-type access
 port default vlan 30
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interface GigabitEthernet0/0/1
 port link-type trunk
 port trunk allow-pass vlan 10 30
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