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1、DHCP跨Vlan分配IP地址Switch：Vlanda*进入vlan数据库，先创建两个vlanVlan2Vlan3Exit!interfaceFastEthernet0/1!interfaceFastEthernet0/2switchportaccessvlan2*相应的端口划入vlan!interfaceFastEthernet0/3switchportaccessvlan3SW#shvlan-swVLANNameStatusPorts---------------------------------------------------------------------
2、-------1defaultactiveFa0/0,Fa0/1,Fa0/4,Fa0/5Fa0/6,Fa0/7,Fa0/8,Fa0/9Fa0/10,Fa0/11,Fa0/12,Fa0/13Fa0/14,Fa0/152VLAN0002activeFa0/2*检查端口是否划入相应的vlan3VLAN0003activeFa0/3!interfaceVlan1ipaddress172.16.1.2255.255.255.0*在vlan下配置IP地址!interfaceVlan2ipaddress172.16.2.1255.255.255.0iphelper-address172.1
3、6.1.1*最重要的一条，把广播包划为单播包，使DHCP_ser可以跨vlan分IP!interfaceVlan3ipaddress172.16.3.1255.255.255.0iphelper-address172.16.1.1*最重要的一条，把广播包划为单播包，使DHCP_ser可以跨vlan分IPDHCP_Ser:ipdhcpexcluded-address172.16.1.1172.16.1.5*保留的IP地址，给服务器、vlan接口使用ipdhcpexcluded-address172.16.2.1ipdhcpexcluded-address172.16.3.1!
4、ipdhcppoolvlan1.pool*创建一个地址池，“vlan1.pool”为地址池的名字network172.16.1.0255.255.255.0*地址池要分配地址的范围.注:掩码可以使用/24,或点分十进制default-router172.16.1.1*DHCP服务器的地址dns-server61.139.2.69*这里为当地的DNS地址,第一个为主,再添加一个则为辅助DNSdomain-namevlan1.com*地址池的域名,lease3*租期,时间范围可以0~365天,也可是用infinite,标记为永久的!ipdhcppoolvlan2.pool
5、network172.16.2.0255.255.255.0default-router172.16.2.1dns-server61.139.2.69domain-namevlan2.comlease3!ipdhcppoolvlan3.poolnetwork172.16.3.0255.255.255.0default-router172.16.3.1dns-server61.139.2.69domain-namevlan3.com!interfaceFastEthernet0/0*此接口为DHCP服务器的地址ipaddress172.16.1.1255.255.255.0dup
6、lexautospeedauto!iproute172.16.2.0255.255.255.0172.16.1.2*如不配置,可接受到客户地址请求,但IP分不到客户端去iproute172.16.3.0255.255.255.0172.16.1.2dhcp_server#debugipdhcpserverpacketdhcp_server#*Mar100:33:31.415:DHCPD:DHCPDISCOVERreceivedfromclient0063.6973.636f.2d63.6330.302e.3030.6263.2e30.3030.302d.4661.302f.30
7、throughrelay172.16.3.1.*Mar100:33:31.419:DHCPD:SendingDHCPOFFERtoclient0063.6973.636f.2d63.6330.302e.3030.6263.2e30.3030.302d.4661.302f.30(172.16.3.2).*Mar100:33:31.419:DHCPD:unicastingBOOTREPLYforclientcc00.00bc.0000torelay172.16.3.1.*Mar100
