cisco三层交换机配置vlan和DHCP攻略

ip dhcp pool IT_WEIXIU //配置DHCP服务
network 10.42.86.0 255.255.255.224 //配置DHCP网段
default-router 10.42.86.30 //DHCP分配网关（应为vlan接口IP）
dns-server 10.42.0.82 10.1.2.9 10.1.2.70 //DHCP分配DNS
netbios-name-server 10.1.2.9 10.1.2.70 10.1.2.222 //DHCP分配WINS
!


vlan 100 //建立vlan
name IT_weixiu //vlan命名

interface FastEthernet0/25
switchport access vlan 100
!
interface FastEthernet0/26
switchport access vlan 100
!
interface FastEthernet0/27
switchport access vlan 100
!
interface FastEthernet0/28
switchport access vlan 100
!
interface FastEthernet0/29
switchport access vlan 100
!
interface FastEthernet0/30
switchport access vlan 100 //端口指定vlan
!

!
interface Vlan100 //配置vlan接口
description IT_weixiu
ip address 10.42.86.30 255.255.255.224 //配置vlan接口IP为网关
no ip proxy-arp
ip ospf 100 area 42 //加入ospf动态路由图（因下方已包含，本条不必要）
!
interface Vlan200
description To_SongZi
ip address 10.42.85.30 255.255.255.224
ip helper-address 10.42.0.16 //指定本网段DHCP服务器为分公司（不指定本条即由本网段内提供DHCP服务或不提供）
no ip proxy-arp
ip ospf 100 area 42 ┗━DHCP服务采用广播协议，故：1不能跨网段；2同一网段只能一台DHCP服务
! “ip helper-address”命令即专用来解决DHCP不能跨网段问题。

!
router ospf 100
router-id 10.125.64.78
log-adjacency-changes
area 42 nssa
network 10.42.0.0 0.0.255.255 area 42 //本设备中所有10.42网段全部自动加入OSPF动态路由
network 10.125.0.0 0.0.255.255 area 42