利用SVI建立vlan间路由并使用dhcp动态获取接口地址

拓扑图如上图所示，R1作为交换机，DS1作为多层交换机，AS1，AS2模拟主机。AS1，AS2都自动获取ip地址，并将R1当作dhcp服务器。

R1其配置如下：

ip dhcp excluded-address 192.168.3.1

ip dhcp excluded-address 192.168.3.2

ip dhcp pool net2

network 192.168.1.0 255.255.255.0

ip dhcp pool net3

network 192.168.2.0 255.255.255.0

no ip domain lookup

interface Loopback0

ip address 1.1.1.1 255.255.255.255

interface FastEthernet0/0

ip address 192.168.3.1 255.255.255.0

router eigrp 1

network 1.1.1.1 0.0.0.0

network 192.168.3.0

DS1的配置如下：

ip routing

interface FastEthernet0/0

no switchport

ip address 192.168.3.2 255.255.255.0    

interface FastEthernet0/1

switchport access vlan 2

no ip address

interface FastEthernet0/2

switchport access vlan 3

no ip address

interface Vlan2

ip address 192.168.1.1 255.255.255.0

ip helper-address 192.168.3.2//由于dhcp是以广播的形式向外发送的，而路由器以及三层交换机是抑制广播域的，所以要在接口上配置一个辅助接口，来转发广播

interface Vlan3

ip address 192.168.2.1 255.255.255.0

ip helper-address 192.168.3.2        

router eigrp 1

network 192.168.1.0

network 192.168.2.0

network 192.168.3.0

auto-summary

AS1的配置如下：

no ip routing

int f0/0

ip add dhcp

no shutdown

ip default-gateway 192.168.1.1

AS2的配置如下：

no ip routing

int f0/0

ip add dhcp

no shutdown

ip default-gateway 192.168.2.1