Ender204426777乾颐堂CCNAv3.0课程BuildingaMedium-SizedNetworkUsingaCiscoNetworkDeviceasaDHCPServer配置思科设备用作DHCP服务器乾颐堂CCNAv3.0Ender204426777NeedforaDHCPServerAmanualIPaddressassignmentinamedium-sizedLANisasfollows:•Timeconsuming-浪费时间•Pronetoerrors-容易出错•Unfavorabletoemployeemobility-毫无扩展性ADHCPIPaddressassignmentinasegmentedLANisasfollows:•AnIPaddressthatisautomaticallyassignedinaccordancewithuserVLANsettings根据用户VLAN属性，地址被自动的指定分配•AcentralizedIPaddressallocationthatenablesconsistencyacrossthewholeorganization通过和中心地址的关联，使得整个组织有连续的和层次化的结构Ender36乾颐堂CCNAv3.0Ender204426777UnderstandingDHCPEnder37乾颐堂CCNAv3.0Ender204426777ConfiguringaDHCPServerConfigurationscenario:•ConfigureaDHCPserveronaCiscorouter•AssignIPaddressesfromaddresspool10.1.50.0/24withaleasetimeof12hours分配网段以及租期为12小时•DonotassignIPaddressesfrom10.1.50.1to10.1.50.50排除的地址•Additionalparameters:defaultgateway,domainname,andDNSserver其他参数Ender38乾颐堂CCNAv3.0Ender204426777ConfiguringaDHCPServer(Cont.)CiscoIOSDHCPserverconfiguration:•EntertheDHCPpoolconfigurationmode•AssignDHCPparameterstotheDHCPpool•ExcludeIPaddressesfromtheDHCPassignmentBranch(config)#ipdhcppoolGuestsBranch(dhcp-config)#network10.1.50.0/24Branch(dhcp-config)#default-router10.1.50.1Branch(dhcp-config)#dns-server10.1.50.1Branch(dhcp-config)#domain-nameexample.comBranch(dhcp-config)#lease012Branch(dhcp-config)#exitBranch(config)#ipdhcpexcluded-address10.1.50.110.1.50.50Ender39乾颐堂CCNAv3.0Ender204426777MonitoringDHCPServerFunctions•VerifiesinformationaboutconfiguredDHCPaddresspoolsBranch#showipdhcppoolPoolGuests:Utilizationmark(high/low):100/0Subnetsize(first/next):0/0Totaladdresses:254Leasedaddresses:2Pendingevent:none1subnetiscurrentlyinthepool:CurrentindexIPaddressrangeLeasedaddresses10.1.50.5510.1.50.1-10.1.50.2542Ender40乾颐堂CCNAv3.0Ender204426777MonitoringDHCPServerFunctions•DisplaysaddressbindingsinformationBranch#showipdhcpbindingBindi...
