DHCP端口设置命令剖析(1)

文章中，我们针对DHCP端口的一些配置内容进行了讲解和介绍。希望本文所提供的代码以及命令能够给大家一些帮助。

在一些DHCP服务器的配置中，少不了端口的设置。这个也是对于路由器和交换机配置来说非常核心的问题了。用一台cisco 3560来做DHCP服务器，有时候要启多个DHCP来工作。那么我们应该怎么做呢。

首先我们要把交换端口关闭掉，换成L3的接口。配置上IP地址。再来设置DHCP地址池。我们要让端口f0/1上来的主机分配0网段的IP地址，让f0/2上来的主机分配1网段，那么，我们就应该配置好地址池后，在接口下用到ip help-address 来给客户端的查询指定一个服务地址。详细见配置。以下配置在真实3560上得到通过。

Switch#sh run 首先我们看下运行中的配置清单

Switch#sh running-config

Building configuration...

Current configuration : 1326 bytes

!

version 12.2

no service pad

service timestamps debug uptime

service timestamps log uptime

no service password-encryption

!

hostname Switch

!

!

no aaa new-model

system mtu routing 1500

ip subnet-zero

no ip domain-lookup

!

!

!

!

!

!

!

!

!

spanning-tree mode pvst

spanning-tree extend system-id

!

vlan internal allocation policy ascending

!

!

!

!

interface FastEthernet0/1

shutdown

!

interface FastEthernet0/2

!

interface FastEthernet0/3

!

interface FastEthernet0/4

!

interface FastEthernet0/5

!

interface FastEthernet0/6

!

interface FastEthernet0/7

!

interface FastEthernet0/8

!

interface FastEthernet0/9

!

interface FastEthernet0/10

!

interface FastEthernet0/11

!

interface FastEthernet0/12

!

interface FastEthernet0/13

!

interface FastEthernet0/14

!

interface FastEthernet0/15

!

interface FastEthernet0/16

!

interface FastEthernet0/17

!

interface FastEthernet0/18

!

interface FastEthernet0/19

!

interface FastEthernet0/20

!

interface FastEthernet0/21

!

interface FastEthernet0/22

!

interface FastEthernet0/23

no switchport

ip address 192.168.100.1 255.255.255.0

!

interface FastEthernet0/24

!

interface GigabitEthernet0/1

!

interface GigabitEthernet0/2

!

interface Vlan1

no ip address

!

ip classless

ip http server

ip http secure-server

!

!

!

control-plane

!

!

line con 0

line vty 0 4

login

line vty 5 15

login

!

end

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文章中，我们针对DHCP端口的一些配置内容进行了讲解和介绍。希望本文所提供的代码以及命令能够给大家一些帮助。

Switch#conf t

Switch(config)#int fa 0/1 进入F0/1

Switch(config-if)#no switchport 关闭L2端口

Switch(config-if)#ip add 10.0.0.1 255.255.255.0 配置IP地址

Switch(config-if)#no sh 打开端口

Switch(config-if)#exi

Switch(config)#int fa 0/2

Switch(config-if)#no sw

Switch(config-if)#no switchport

Switch(config-if)#no sh

Switch(config-if)#ip add 10.0.1.1 255.255.255.0

Switch(config-if)#no sh

Switch(config-if)#exi

Switch(config)#ip dhcp pool ccna 设置DHCP组

Switch(dhcp-config)#network 10.0.0.0 255.255.255.0 地址池

Switch(dhcp-config)#default-router 10.0.0.254 缺省路由（网关）

Switch(dhcp-config)#dns-server 202.103.24.68 DNS地址设置

Switch(dhcp-config)#lease 365 地址租期

Switch(dhcp-config)#exi

Switch(config)#ip dhcp pool ccnp

Switch(dhcp-config)#network 10.0.1.0 255.255.255.0

Switch(dhcp-config)#default-router 10.0.1.254

Switch(dhcp-config)#dns-server 202.103.24.68

Switch(dhcp-config)#lease 365

Switch(dhcp-config)#exi

Switch(config)#ip dhcp excluded-address 10.0.0.1 不参与分配的地址

Switch(config)#ip dhcp excluded-address 10.0.0.254

Switch(config)#ip dhcp excluded-address 10.0.1.254

Switch(config)#ip dhcp excluded-address 10.0.1.1

Switch(config)#exi

Switch(config)#int fa 0/1

Switch(config-if)#ip helper-address 10.0.0.1 指定帮助地址，它将默认转发给8个UDP服务

Switch(config-if)#exi

Switch(config)#int fa 0/2

Switch(config-if)#ip helper-address 10.0.1.1

Switch(config-if)#exi

Switch#sh run

Switch#sh running-config

Building configuration...

 

Current configuration : 1864 bytes

!

version 12.2

no service pad

service timestamps debug uptime

service timestamps log uptime

no service password-encryption

!

hostname Switch

!

!

no aaa new-model

system mtu routing 1500

ip subnet-zero

no ip domain-lookup

ip dhcp excluded-address 10.0.0.1

ip dhcp excluded-address 10.0.0.254

ip dhcp excluded-address 10.0.1.254

ip dhcp excluded-address 10.0.1.1

!

ip dhcp pool ccna

network 10.0.0.0 255.255.255.0

default-router 10.0.0.254

dns-server 202.103.24.68

lease 365

!

ip dhcp pool ccnp

network 10.0.1.0 255.255.255.0

default-router 10.0.1.254

dns-server 202.103.24.68

lease 365

!

!

!

!

!

!

!

!

!

spanning-tree mode pvst

spanning-tree extend system-id

!

vlan internal allocation policy ascending

!

!

!

!

interface FastEthernet0/1

no switchport

ip address 10.0.0.1 255.255.255.0

ip helper-address 10.0.0.1

!

interface FastEthernet0/2

no switchport

ip address 10.0.1.1 255.255.255.0

ip helper-address 10.0.1.1

!

interface FastEthernet0/3

!

interface FastEthernet0/4

!

interface FastEthernet0/5

!

interface FastEthernet0/6

!

interface FastEthernet0/7

!

interface FastEthernet0/8

!

interface FastEthernet0/9

!

interface FastEthernet0/10

!

interface FastEthernet0/11

!

interface FastEthernet0/12

!

interface FastEthernet0/13

!

interface FastEthernet0/14

!

interface FastEthernet0/15

!

interface FastEthernet0/16

!

interface FastEthernet0/17

!

interface FastEthernet0/18

!

interface FastEthernet0/19

!

interface FastEthernet0/20

!

interface FastEthernet0/21

!

interface FastEthernet0/22

!

interface FastEthernet0/23

no switchport

ip address 192.168.100.1 255.255.255.0

!

interface FastEthernet0/24

!

Switch#sh arp

Protocol Address Age (min) Hardware Addr Type Interface

Internet 10.0.0.2 0 001a.4b58.42a9 ARPA FastEthernet0/1

Internet 10.0.1.1 - 001e.4a0a.2042 ARPA FastEthernet0/2

Internet 10.0.0.1 - 001e.4a0a.2041 ARPA FastEthernet0/1

Internet 192.168.100.1 - 001e.4a0a.2043 ARPA FastEthernet0/23

根据上面的配置，现在我们只要连接到f0/1口上，那么客户端分配到的地址将是0网段的地址 ,如果连接到f 0/2口上，那么客户端将分配到1网段的地址。

help-address的说明：

help-address 缺省转发的8个udp服务：time37 , tacacs49 , dns53 , boot/dhcp服务器67 , boot/dhcp客户端68 , tftp69 , netbios名字服务137, netbios数据报服务138