用思科c3600三層交換機作dhcp中繼

1、添加硬件

一、增長一臺router c3600，點配置，到Slots，增長兩個NM-1FE-TX，開機並命名爲dhcp

二、增長一臺router c3600，點配置，到Slots，增長一個NM-16ESW（使這臺機成爲交換機），開機並命名爲relay

三、增長一臺host

四、dhcp的f0/0鏈接reply的f0/0，host的nio_udp:30000接reply的f0/1，host的nio_udp:30001接reply的f0/2

2、設置dhcp的ip、默認路由、dhcp池

dhcp池:

dhcp(config)#ip dhcp pool vl2

dhcp(dhcp-config)#network 192.168.2.0 255.255.255.0

dhcp(dhcp-config)#default-router 192.168.2.253

dhcp(dhcp-config)#dns-server 202.86.20.3

dhcp(dhcp-config)#exit

dhcp(config)#ip dhcp pool vl3

dhcp(dhcp-config)#network 192.168.3.0 255.255.255.0

dhcp(dhcp-config)#default-router 192.168.3.253

dhcp(dhcp-config)#dns-server 202.86.20.3

dhcp(dhcp-config)#exit

ip地址：

dhcp(config)#int f 0/0

dhcp(config-if)#ip address 192.168.2.254 255.255.255.0

dhcp(config-if)#no sh

dhcp(config-if)#exit

指定不分配的ip:

dhcp(config)#ip dhcp excluded-address 192.168.2.250 192.168.2.254

dhcp(config)#ip dhcp excluded-address 192.168.3.250 192.168.3.254

設置默認路由:

dhcp(config)#ip route 0.0.0.0 0.0.0.0 192.168.2.253

3、設置relay的vlan與使交換機成爲dhcp中繼

一、添加vlan

relay#vlan database

relay(vlan)#vlan 2 name it

VLAN 2 added:

    Name: it

relay(vlan)#vlan 3 name cw

VLAN 3 added:

    Name: cw

relay(vlan)#exit

APPLY completed.

Exiting....

relay#configure terminal

Enter configuration commands, one per line.  End with CNTL/Z.

relay(config)#int vlan 2

relay(config-if)#ip address 192.168.2.253 255.255.255.0

relay(config-if)#no sh

relay(config-if)#exit

relay(config)#int vlan 2

relay(config-if)#ip address 192.168.3.253 255.255.255.0

relay(config-if)#no sh

relay(config-if)#exit

二、把f0/0 - 1設置爲vlan二、把f0/2 - 3設置爲vlan3

relay(config)#int range fastEthernet 0/0 - 1

relay(config-if-range)#switchport mode access

relay(config-if-range)#switchport access vlan 2

relay(config-if-range)#spanning-tree portfast

relay(config-if-range)#exit

relay(config)#int range fastEthernet 0/0 - 1

relay(config-if-range)#switchport mode access

relay(config-if-range)#switchport access vlan 2

relay(config-if-range)#spanning-tree portfast

relay(config-if-range)#exit

三、開啓路由功能、設定爲dhcp中繼

relay(config)#ip routing

relay(config)#service dhcp

relay(config)#ip dhcp relay information option

四、設置DHCP服務器地址

relay(config)#int vlan 3

relay(config-if)#ip helper-address 192.168.2.254

4、在pc機中測試

在gns的目錄找到vpcs並運行，在pc1的cmd中輸入ip dhcp，得到ip192.168.2.XX後，輸入2，切換到pc2，在cmd中輸入ip dhcp，得到ip192.168.3.XX，則證實不一樣的vlan得到不一樣網段的ip，又能ping通不一樣網段，則證實dhcp中繼配置成功。