2006 年 09 月 09 日, 星期六
3550配置DHCP中继代理工程实例 (DHCP跨网段分配IP地址)
普通的DHCP 的IP地址分配应该都没有什么问题，这里从 net130摘抄了这位兄弟的详细配置，大家可以参考。(原创)3550配置DHCP中继代理工程实例 作者：usr001 3550配置dhcp,网络上多有讨论，但大都存在错漏，按照网上介绍的配置一句“IP HELPER-ADDRESS DHCP服务器地址”后，工程当中发现客户机不能从DHCP服务器获取IP地址，本人最近也刚好配置了3550作为DHCP服务器中继代理，最初也曾困惑很久，后来在网上查找资料及在论坛上寻求众人帮助，终于在工程当中测试通过，为避免大家在工程当中遇到此类情况左调右调，特将配置过程写出来，给大家作为参考。 网络环境：一台3550EMI交换机，划分三个vlan,vlan2 为服务器所在网络，命名为server,IP地址段为192.168.2.0,子网掩码:255.255.255.0,网关:192.168.2.1,域服务器为windows 2000 advance server,同时兼作DHCP服务器，DNS服务器，IP地址为192.168.2.10,vlan3为客户机1所在网络，IP地址段为192.168.3.0,子网掩码:255.255.255.0,网关:192.168.3.1命名为work01,vlan4 为客户机2所在网络,命名为work02,IP地址段为192.168.4.0,子网掩码:255.255.255.0,网关:192.168.4.1. 3550上端口1-8划到VLAN 2，端口9-16划分到VLAN 3,端口17-24划分到VLAN 4. 配置命令及步骤如下： 第一步：创建VLAN： Switch>Vlan Database Switch(Vlan)>Vlan 2 Name server Switch(Vlan)>Vlan 3 Name work01 Switch(vlan)>Vlan 4 Name work02 第二步：启用DHCP中继代理： /*关键一步，若缺少以下两条命令，在VLAN中使用“IP HELPER-ADDRESS DHCP服务器地址”指定DHCP服务器，客户机仍然不能获得IP地址*/ Switch>Enable Switch#Config t Switch(Config)Service Dhcp Switch(Config)Ip Dhcp Relay Information Option 第三步：设置VLAN IP地址： Switch(Config)>Int Vlan 2 Switch(Config-vlan)Ip Address 192.168.2.1 255.255.255.0 Switch(Config-vlan)No Shut Switch(Config-vlan)>Int Vlan 3 Switch(Config-vlan)Ip Address 192.168.3.1 255.255.255.0 Switch(Config-vlan)No Shut Switch(Config-vlan)>Int Vlan 4 Switch(Config-vlan)Ip Address 192.168.4.1 255.255.255.0 Switch(Config-vlan)No Shut Switch(Config-vlan)Exit /*注意：由于此时没有将端口分配置到VLAN2，3，4，所以各VLAN会DOWN掉，待将端口分配到各VLAN后，VLAN会起来*/ 第四步：设置端口全局参数 Switch(Config)Interface Range Fa 0/1 - 24 Switch(Config-if-range)Switchport Mode Access Switch(Config-if-range)Spanning-tree Portfast 第五步：将端口添加到VLAN2，3，4中 /*将端口1-8添加到VLAN 2*/ Switch(Config)Interface Range Fa 0/1 - 8 Switch(Config-if-range)Switchport Access Vlan 2 /*将端口9-16添加到VLAN 3*/ Switch(Config)Interface Range Fa 0/9 - 16 Switch(Config-if-range)Switchport Access Vlan 3 /*将端口17-24添加到VLAN 4*/ Switch(Config)Interface Range Fa 0/17 - 24 Switch(Config-if-range)Switchport Access Vlan 4 Switch(Config-if-range)Exit /*经过这一步后，各VLAN会起来*/ 第六步：在VLAN3和4中设定DHCP服务器地址 /*VLAN 2中不须指定DHCP服务器地址*/ Switch(Config)Int Vlan 3 Switch(Config-vlan)Ip Helper-address 192.168.2.10 Switch(Config)Int Vlan 4 Switch(Config-vlan)Ip Helper-address 192.168.2.10 第七步:启用路由 /*路由启用后,各VLAN间主机可互相访问,若需进一步控制访问权限,则需应用到访问控制列表*/ Switch(Config)Ip Routing 第八步：结束并保存配置 Switch(Config-vlan)End Switch#Copy Run Start |
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