#全局DHCP

ip pool vlan100

gateway-list 10.1.123.254 //网关

network 10.1.123.0 mask 255.255.255.0 //可分配地址区域为123网段24位地址

excluded-ip-address 10.1.123.80 //排除该地址分配

dns-list 8.8.8.8 //DNS

domain-name ye.net //域名

interface GigabitEthernet0/0/1

ip address 10.1.123.254 255.255.255.0

dhcp select global //接口使能DHCP

#接口配置 DHCP

interface GigabitEthernet0/0/1

ip address 10.1.123.254 255.255.255.0

dhcp select interface

dhcp server excluded-ip-address 10.1.123.88 //

dhcp server dns-list 8.8.8.8

#

sw4

interface GigabitEthernet0/0/1

port link-type access

port default vlan 100

sw4中继：

r4：

ip pool vlan10

gateway-list 10.1.10.254

network 10.1.10.0 mask 255.255.255.0

dns-list 8.8.8.8

domain-name ye.net

#

ip pool vlan20

gateway-list 10.1.20.254

network 10.1.20.0 mask 255.255.255.0

excluded-ip-address 10.1.20.89

dns-list 8.8.8.8

domain-name ye.net

interface GigabitEthernet0/0/0

ip address 10.1.1.4 255.255.255.0

dhcp select global

ip route-static 0.0.0.0 0.0.0.0 10.1.1.3

#

r3：

ip route-static 0.0.0.0 0.0.0.0 10.1.123.1

#

sw4：

dhcp enable

dhcp server group dhcp

dhcp-server 10.1.1.4 0

interface Vlanif10

ip address 10.1.10.254 255.255.255.0

dhcp select relay

dhcp relay server-select dhcp

interface Vlanif20

ip address 10.1.20.254 255.255.255.0

dhcp select relay

dhcp relay server-select dhcp

ip route-static 10.1.1.0 255.255.255.0 10.1.123.254

验证：

PC>ipconfig

Link local IPv6 address...........: fe80::5689:98ff:fe35:2ab0

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

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

IPv4 address......................: 10.1.20.253

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

Gateway...........................: 10.1.20.254

Physical address..................: 54-89-98-35-2A-B0

DNS server........................: 8.8.8.8