华为路由器交换机DHCP配置实例(二层、三层交换机）

一、条件和拓朴：

R1为DHCP配置网关，S1为二层交换机

二、要求：

PC1获取到vlan10地址，PC2获取vlan10地址，PC3获取vlan20地址

三、实现方式：

         1，单臂路由方式：

S1正常配置vlan10，20，配置与R1相连的1口为trunk口

R1的1口，配置单臂路由，终结vlan10、20

AR1的配置：

dhcp enable
#
ip pool 1
 gateway-list 10.10.10.1 
 network 10.10.10.0 mask 255.255.255.0 
 excluded-ip-address 10.10.10.2
#
ip pool 2
 gateway-list 10.20.20.1 
 network 10.20.20.0 mask 255.255.255.0 
#
interface GigabitEthernet0/0/1.1
 dot1q termination vid 10
 ip address 10.10.10.1 255.255.255.0 
 arp broadcast enable
 dhcp select global
#
interface GigabitEthernet0/0/1.2
 dot1q termination vid 20
 ip address 10.20.20.1 255.255.255.0 
 arp broadcast enable
 dhcp select global
#

         2，透传方式(路由器接口改二层trunk)：

将R1的1口配置为二层的trunk口，配置vlan10、20的vlanif网关为dhcp网关，S1正常配置vlan

interface GigabitEthernet0/0/1
 portswitch
 port link-type trunk
port trunk allow-pass vlan 10 20
#
int vlanif 10
 ip addr 10.10.10.1 24
 dhcp select interface
#int vlanif 20
 ip addr 10.20.20.1 24
 dhcp select interface

         3，网关下沉方式（接入交换机改三层）：

DHCP服务配置在三层交换机，网关也下沉到三层交换机上，通过管理网段和路由器接口连接，则S1配置如下：

vlan batch 10 20 100
#
dhcp enable
#
interface Vlanif2
 ip address 10.10.10.1 255.255.255.0
 dhcp select interface
 dhcp server dns-list 114.114.114.114 8.8.8.8
#
interface Vlanif3
 ip address 10.20.20.1 255.255.255.0
 dhcp select interface
 dhcp server dns-list 114.114.114.114 8.8.8.8
#
interface Vlanif100
 ip address 10.100.100.2 255.255.255.0
#
interface GE 1/0/1
 port default vlan 100
#
interface GE 1/0/2
 port default vlan 10
#
interface GE 1/0/3
 port default vlan 20
#
ip route-static 0.0.0.0 0.0.0.0 10.100.100.1
#

R1配置如下（含nat配置）：

acl number 2001
 rule 5 permit source 10.0.0.0 0.255.255.255
#
interface GigabitEthernet0/0/1
 ip address 10.100.100.1 255.255.255.0
#
interface GigabitEthernet0/0/2
 ip address 203.0.113.46 255.255.255.30
 nat outbound 2001
#
ip route-static 0.0.0.0 0.0.0.0 203.0.113.45
ip route-static 10.0.0.0 255.255.255.0 10.100.100.2

         4，dhcp中继方式（接入交换机配置dhcp relay）：

R1改为交换机S0，定义IP池，定义管理网段100，配置管理地址，trunk方式连接S1；

S1配置vlanif网关，启用dhcp中继，使用本机的管理IP为中继地址，配置默认路由为S0的管理IP。S1配置如下：

interface Vlanif10
 ip address 10.10.10.1 255.255.255.0
 dhcp select relay
 dhcp relay server-ip 10.1.200.29
#
interface Vlanif20
 ip address 10.20.20.1 255.255.255.0
 dhcp select relay
 dhcp relay server-ip 10.1.200.29
#
interface Vlanif100
 ip address 10.100.100.2 255.255.255.252
#
ip route-static 0.0.0.0 0.0.0.0 10.100.100.1