应用场景：通常在DHCP分配网段过多的情况下，网关路由器上配置DHCP服务，压力过大，一般我们用第二路由器，或则第二台DHCP服务器来分担业务实验拓扑图实验环境：R4作为DHCP服务器，R1, R2.
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应用场景：
通常在DHCP分配网段过多的情况下，网关路由器上配置DHCP服务，压力过大，一般我们用第二路由器，或则第二台DHCP服务器来分担业务
实验拓扑图
实验环境：
R4作为DHCP服务器，R1, R2.上做中继服务，实现不同网段的pc获取地址
1、配置sw交换机
宣告vlan，e口配置为access口，g口配置为trunk口
<Huawei>sys ##进入系统视图模式[Huawei]sysname SW1 ##修改名字[SW1]vlan bat 10 20 ##创建vlan10 20Info: This operation may take a few seconds. Please wait for a moment...done.[SW1]int e0/0/1 ##进接口[SW1-Ethernet0/0/1]port link-type access ##配置为access口[SW1-Ethernet0/0/1]port default vlan 10 ##将接口放到vlan10中[SW1-Ethernet0/0/1]un sh ##开启[SW1-Ethernet0/0/1]int e0/0/2 ##e0/0/2接口[SW1-Ethernet0/0/2]port link-type access [SW1-Ethernet0/0/2]port default vlan 20 ##放到vlan20中[SW1-Ethernet0/0/2]un sh[SW1-Ethernet0/0/2]int e0/0/3 [SW1-Ethernet0/0/3]port link-type access [SW1-Ethernet0/0/3]port default vlan 10 [SW1-Ethernet0/0/3]un sh[SW1-Ethernet0/0/3]int e0/0/4[SW1-Ethernet0/0/4]port link-type access[SW1-Ethernet0/0/4]port default vlan 20[SW1-Ethernet0/0/4]un sh[SW1-Ethernet0/0/4]dis vlan ##查看vlan信息The total number of vlans is : 3--------------------------------------------------------------------------------U: Up; D: Down; TG: Tagged; UT: Untagged;MP: Vlan-mapping; ST: Vlan-stacking;#: ProtocolTransparent-vlan; *: Management-vlan;--------------------------------------------------------------------------------VID Type Ports --------------------------------------------------------------------------------1 common UT:Eth0/0/5(D) Eth0/0/6(D) Eth0/0/7(D) Eth0/0/8(D) Eth0/0/9(D) Eth0/0/10(D) Eth0/0/11(D) Eth0/0/12(D) Eth0/0/13(D) Eth0/0/14(D) Eth0/0/15(D) Eth0/0/16(D) Eth0/0/17(D) Eth0/0/18(D) Eth0/0/19(D) Eth0/0/20(D) Eth0/0/21(D) Eth0/0/22(D) GE0/0/1(U) GE0/0/2(D) 10 common UT:Eth0/0/1(U) Eth0/0/3(U) 20 common UT:Eth0/0/2(U) Eth0/0/4(U) VID Status Property MAC-LRN Statistics Description --------------------------------------------------------------------------------1 enable default enable disable VLAN 0001 10 enable default enable disable VLAN 0010 20 enable default enable disable VLAN 0020 [SW1-Ethernet0/0/4]int g0/0/1 ##进入接口[SW1-GigabitEthernet0/0/1] port link-type trunk ##设置为trunk口[SW1-GigabitEthernet0/0/1]port trunk allow-pass vlan all ##允许所有vlan通过[SW1-GigabitEthernet0/0/1]un sh ##开启
2、配置R1路由
先配置单臂路由，进入逻辑子接口中开启dhcp中继服务，指定dhcp中继服务器地址。
配置g口ip
配置静态路由
[R1]dhcp enable ##开启dhcp[R1]int g0/0/1.10 ##进入逻辑子接口[R1-GigabitEthernet0/0/1.10]dot1q termination vid 10 ##封装协议，该接口对应vlan10[R1-GigabitEthernet0/0/1.10]ip add 192.168.10.1 24 ##配置网关地址[R1-GigabitEthernet0/0/1.10]arp broadcast enable ##开启广播[R1-GigabitEthernet0/0/1.10]dhcp select relay ##开启DHCP中继服务[R1-GigabitEthernet0/0/1.10]dhcp relay server-ip 14.0.0.2 ##指向R1服务器地址[R1-GigabitEthernet0/0/1.10]int g0/0/1.20 ##进入逻辑子接口[R1-GigabitEthernet0/0/1.20]dot1q termination vid 20 ##vlan20[R1-GigabitEthernet0/0/1.20]ip add 192.168.20.1 24[R1-GigabitEthernet0/0/1.20]arp broadcast enable [R1-GigabitEthernet0/0/1.20]dhcp select relay [R1-GigabitEthernet0/0/1.20]dhcp relay server-ip 14.0.0.2[R1-GigabitEthernet0/0/1.20]q[R1]int g0/0/2 ##配置接口的ip地址[R1-GigabitEthernet0/0/2]ip add 14.0.0.1 24[R1-GigabitEthernet0/0/2]un sh[R1-GigabitEthernet0/0/2]int g0/0/0[R1-GigabitEthernet0/0/0]ip add 12.0.0.1 24[R1-GigabitEthernet0/0/0]un sh[R1-GigabitEthernet0/0/0]dis ip int b ##查看接口ip信息*down: administratively down!down: FIB overload down^down: standby(l): loopback(s): spoofing(d): Dampening SuppressedThe number of interface that is UP in Physical is 6The number of interface that is DOWN in Physical is 7The number of interface that is UP in Protocol is 5The number of interface that is DOWN in Protocol is 8Interface IP Address/Mask Physical Protocol Ethernet0/0/0 unassigned down down Ethernet0/0/1 unassigned down down GigabitEthernet0/0/0 12.0.0.1/24 up up GigabitEthernet0/0/1 unassigned up down GigabitEthernet0/0/1.10 192.168.10.1/24 up up GigabitEthernet0/0/1.20 192.168.20.1/24 up up GigabitEthernet0/0/2 14.0.0.1/24 up up GigabitEthernet0/0/3 unassigned down down NULL0 unassigned up up(s) [R1]ip route-static 15.0.0.0 24 12.0.0.2 ##设置静态路由
3、配置R2路由
配置接口，
全局模式开启dhcp服务，指定dhcp服务器ip
设置默认路由
<Huawei>sys[Huawei]sysname R2[R2]int g0/0/0 ##配置接口IP地址[R2-GigabitEthernet0/0/0]ip add 12.0.0.2 24[R2-GigabitEthernet0/0/0]un sh[R2-GigabitEthernet0/0/0]q[R2]dhcp enable ##开启dhcp[R2]int g0/0/1 ##进接口[R2-GigabitEthernet0/0/1]ip add 15.0.0.1 24 ##配置接口ip[R2-GigabitEthernet0/0/1]dhcp select relay ##开启中继[R2-GigabitEthernet0/0/1]dhcp relay server-ip 14.0.0.2 ##指向服务器地址[R2-GigabitEthernet0/0/1]un sh[R2-GigabitEthernet0/0/1]q [R2]ip route-static 0.0.0.0 0.0.0.0 12.0.0.1 ##设置默认路由[R2]dis ip int b ##查看接口ip信息*down: administratively down!down: FIB overload down^down: standby(l): loopback(s): spoofing(d): Dampening SuppressedThe number of interface that is UP in Physical is 3The number of interface that is DOWN in Physical is 8The number of interface that is UP in Protocol is 3The number of interface that is DOWN in Protocol is 8Interface IP Address/Mask Physical Protocol Ethernet0/0/0 unassigned down down Ethernet0/0/1 unassigned down down GigabitEthernet0/0/0 12.0.0.2/24 up up GigabitEthernet0/0/1 15.0.0.1/24 up up GigabitEthernet0/0/2 unassigned down down GigabitEthernet0/0/3 unassigned down down NULL0 unassigned up up(s)
4、配置R4路由
全局模式下开启dhcp服务
进入接口设置dhcp
全局模式下配置vlan地址池
设置默认路由
[R4]dhcp enable ##开启dhcp[R4]int g0/0/0 ##进入接口[R4-GigabitEthernet0/0/0]ip add 14.0.0.2 24 ##配置ip地址[R4-GigabitEthernet0/0/0]dhcp select global ##设置全局[R4-GigabitEthernet0/0/0]un sh[R4-GigabitEthernet0/0/0]q[R4]ip route-static 0.0.0.0 0.0.0.0 14.0.0.1 ##设置默认路由[R4]ip pool dhcp15 ##创建15网段的地址池[R4-ip-pool-dhcp15]network 15.0.0.0 mask 24 ##设置ip地址段和子网掩码[R4-ip-pool-dhcp15]gateway-list 15.0.0.1 ##设置网关[R4-ip-pool-dhcp15]dns-list 8.8.8.8 2.2.2.2 ##设置dns地址[R4-ip-pool-dhcp15]q[R4]ip pool dhcpvlan10 ##创建vlan10的地址池[R4-ip-pool-dhcpvlan10]network 192.168.10.0 mask 24[R4-ip-pool-dhcpvlan10]gateway-list 192.168.10.1[R4-ip-pool-dhcpvlan10]dns-list 8.8.8.8 2.2.2.2[R4-ip-pool-dhcpvlan10]excluded-ip-address 192.168.10.100 192.168.10.254 ##排除的地址[R4-ip-pool-dhcpvlan10]static-bind ip-address 192.168.10.88 mac-address 5489-9820-62fb ##设置固定ip[R4-ip-pool-dhcpvlan10]q [R4]ip pool dhcpvlan20 ##创建vlan20地址池[R4-ip-pool-dhcpvlan20]network 192.168.20.0 mask 24 [R4-ip-pool-dhcpvlan20]gateway-list 192.168.20.1[R4-ip-pool-dhcpvlan20]dns-list 8.8.8.8 2.2.2.2[R4-ip-pool-dhcpvlan20]q
5、查看pc机是否可以获得ip地址
试验完成。
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