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在三层交换机配置DHCP的方法

所属栏目: 交换机 | 发布时间:2017-03-20 11:50:48 | 小编:叨叨 | #我要评论#

  通过本实验掌握,如何在Cisco Catalyst 3550交换机来配置DHCP服务,实现对内网主机分配IP地址,网关,DNS,WINS,租期,域名等。接下来是有代理小编为大家收集的在三层交换机配置DHCP的方法,希望能帮到大家。

  在三层交换机配置DHCP的方法

  可能你之前是在windows Server服务器或者Cisco Router 部署过DHCP,但在工程项目中,根据需求,大多是在接入层或者汇聚层多层交换机来配置的,可以同时实现DHCP Snooping等技术。

在三层交换机配置DHCP的方法

  实验过程:

  第一步:Catalyst 3550底层配置

  Switch(config)#no ip do lo

  Switch(config)#line con 0

  Switch(config-line)#no exec-t

  Switch(config-line)#logg syn

  Switch(config-line)#host Switch_Dhcp

  Switch_Dhcp(config)#int f0/1

  Switch_Dhcp(config-if)#no sh

  Switch_Dhcp(config-if)#spanning-tree portfast

  //连接终端的接口下,开启portfast特性,跳过生成树的选举,接口立即进入转发状态

  %Warning: portfast should only be enabled on ports connected to a single

  host. Connecting hubs, concentrators, switches, bridges, etc... to this

  interface when portfast is enabled, can cause temporary bridging loops.

  Use with CAUTION

  %Portfast has been configured on FastEthernet0/1 but will only

  have effect when the interface is in a non-trunking mode.

  Switch_Dhcp(config-if)#end

  第二步: 开启DHCP服务,定义分配地址池范围及掩码,网关,DNS,域名,租期等

  //全局下开启DHCP服务,该服务默认是关闭的

  Switch_Dhcp(config)#service dhcp

  //关闭DHCP分配冲突,日志记录消息

  Switch_Dhcp(config)#no ip dhcp conflict logging

  //创建DHCP地址池,名称为可以是任意字符

  Switch_Dhcp(config)#ip dhcp pool cisco

  //指定要通过DHCP分配的网段和掩码,还有另外一种写法(192.168.0.0 255.255.255.0)

  Switch_Dhcp(dhcp-config)#network 192.168.0.0 /24

  //指定分配的网关地址

  Switch_Dhcp(dhcp-config)#default-router 192.168.0.1

  //指定DHCP域名,域名可以为任意字符

  Switch_Dhcp(dhcp-config)#domain-name www.cisco.com.cn

  //指定PC通过DHCP分配到DNS地址,(这里指定的是当地电信部门的真实地址,全国各地市不一样的)

  Switch_Dhcp(dhcp-config)#dns 218.30.19.40 61.134.1.4

  //netbios服务器地址,可选的配置

  Switch_Dhcp(dhcp-config)#netbios-name-server 192.168.0.10

  //指定通过DHCP分配到地址,租期为永久

  Switch_Dhcp(dhcp-config)#lease infinite

  Switch_Dhcp(dhcp-config)#end

  //指定不通过DHCP 地址池中分配的地址,也就是排除的地址。如果这些地址被分配给PC使用,就有可能造成网络中IP地址冲突。如:192.168.0.1 是网关地址,该地址只能是分配所有PC做网关地址,不能做IP地址使用。所以要排除。

  Switch_Dhcp(config)#ip dhcp excluded-address 192.168.0.1

  Switch_Dhcp(config)# ip dhcp excluded-address 192.168.0.10

  第三步:查看VLAN信息,并启用SVI接口

  复制代码

  代码如下:

  Switch_Dhcp#show vlan brief

  VLAN Name Status Ports

  ---- -------------------------------- --------- -------------------------------

  1 default active Fa0/1, Fa0/2, Fa0/3, Fa0/4

  Fa0/5, Fa0/6, Fa0/7, Fa0/8

  Fa0/9, Fa0/10, Fa0/11, Fa0/12

  Fa0/13, Fa0/15, Fa0/16, Fa0/17

  Fa0/18, Fa0/19, Fa0/20, Fa0/21

  Fa0/22, Fa0/23, Fa0/24, Gi0/1

  Gi0/2

  1002 fddi-default act/unsup

  1003 token-ring-default act/unsup

  1004 fddinet-default act/unsup

  1005 trnet-default act/unsup

  Switch_Dhcp#conf t

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

  //进入管理VLAN1 下,启用SVI功能

  Switch_Dhcp(config)#int vlan 1

  //配置VLAN的地址为192.168.0.1 掩码为24位,默认情况下Cisco Catalyst交换机所有的物理接口都属于VLAN1,此地址也就是PC网关地址。

  Switch_Dhcp(config-if)#ip add 192.168.0.1 255.255.255.0

  Switch_Dhcp(config-if)#no sh

  Switch_Dhcp(config-if)#end

  Switch_Dhcp#

  00:09:07: %SYS-5-CONFIG_I: Configured from console by console

  Switch_Dhcp#

  00:09:08: %LINK-3-UPDOWN: Interface Vlan1, changed state to up

  00:09:09: %LINEPROTO-5-UPDOWN: Line protocol on Interface Vlan1, changed state to

  第四步:查看当前交换机配置文件

  复制代码

  代码如下:

  //验证DHCP的配置信息

  Switch_Dhcp#sh run | begin ip dhcp

  no ip dhcp conflict logging

  ip dhcp excluded-address 192.168.0.1

  ip dhcp excluded-address 192.168.0.10

  !

  ip dhcp pool cisco

  network 192.168.0.0 255.255.255.0

  default-router 192.168.0.1

  domain-name www.cisco.com.cn

  dns-server 218.30.19.40 61.134.1.4

  netbios-name-server 192.168.0.10

  lease infinite

  interface Vlan1

  ip address 192.168.0.1 255.255.255.0

  第五步:此时将PC1的网线插入Catalyst 3550 的F0/1接口,并在PC上查看IP地址获得信息。PC上的本地连接,TCP/IP 设置为自动获得IP地址形式。

  PC上查看方法:开始-运行-cmd-ipconfig/all

在三层交换机配置DHCP的方法

  从以上信息可以得出,PC已经能从DHCP服务器获得IP地址等信息,实验现象成功。

  第六步:查看交换机DHCP 动态绑定,以及交换机DHCP Server状态信息

  复制代码

  代码如下:

  //查看DHCP动态绑定信息,从这里可以看到PC,从DHCP地址池中的得到IP地址,以及PC的MAC地址等

  Switch_Dhcp#show ip dhcp binding

  IP address Client-ID/ Lease expiration Type

  Hardware address

  192.168.0.2 0100.16d3.249f.fd Infinite Automatic

  //查看DHCP服务器工作状态

  Switch_Dhcp#show ip dhcp server statistics

  Memory usage 5661

  Address pools 1

  Database agents 0

  Automatic bindings 1

  Manual bindings 0

  Expired bindings 0

  Malformed messages 0

  Message Received

  BOOTREQUEST 0

  DHCPDISCOVER 2

  DHCPREQUEST 3

  DHCPDECLINE 0

  DHCPRELEASE 0

  DHCPINFORM 3

  Message Sent

  BOOTREPLY 0

  DHCPOFFER 2

  DHCPACK 6

  DHCPNAK 0

  Switch_Dhcp#

  Switch_Dhcp#clear ip dhcp binding *

  第七步:使用debug 调试命令查看PC申请IP地址过程(DHCP工作过程)

  在PC上:开始-运行-cmd-ipconfig /release (释放获得IP地址)

  重新申请IP地址ipconfig /renew

  此时查看交换机日志信息

  复制代码

  代码如下:

  Switch_Dhcp#debug ip dhcp server events

  01:13:12: %LINEPROTO-5-UPDOWN: Line protocol on Interface FastEthernet0/1, changed state to up

  Switch_Dhcp#

  01:13:13: DHCPD: DHCPDISCOVER received from client 0100.16d3.249f.fd on interface Vlan1.

  Switch_Dhcp#

  01:13:20: DHCPD: assigned IP address 192.168.0.3 to client 0100.16d3.249f.fd.

  01:13:20: DHCPD: Sending DHCPOFFER to client 0100.16d3.249f.fd (192.168.0.3).

  01:13:20: DHCPD: broadcasting BOOTREPLY to client 0016.d324.9ffd.

  01:13:20: DHCPD: DHCPREQUEST received from client 0100.16d3.249f.fd.

  01:13:20: DHCPD: Sending DHCPACK to client 0100.16d3.249f.fd (192.168.0.3).

  01:13:20: DHCPD: broadcasting BOOTREPLY to client 0016.d324.9ffd.

  Switch_Dhcp#

  01:13:23: DHCPD: DHCPINFORM received from client 0100.16d3.249f.fd (192.168.0.3).

  01:13:23: DHCPD: Sending DHCPACK to client 0100.16d3.249f.fd (192.168.0.3).

  01:13:23: DHCPD: unicasting BOOTREPLY to client 0016.d324.9ffd (192.168.0.3).



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