双isp网络配置方法

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1、某大学双电信isp网络方案（模拟实验）一、网络情况及客户需求：客户之前网络是通过光纤专线到电信上网，现在客户需要再拉根专线实现网络扩容（由以前的1G扩到2G）,并且要求当其中一条线路断掉时，不影响用户的上网。1.1、网络拓扑图如下：在这个拓扑图里，R1、R2模拟两台PC机，R3模拟出口路由器，R4、R5模拟ISP设备。二、实现原理：1、由于双NAT+双默认路由无法实现负载分担（只能走其中一条线路），为了解决这个问题，我采用了策略路由，使不同的网段走不同的线路，从而使得两条外网线路均得到了充分的利用；2、由

2、于配置了双静态路由，故在双线路中，若其中一条线路DOWN掉时，上网流量会自动走另外一条线路，从而实现了链路备份的目的。三、设备配置：3.1、R1的配置：Router#showruRouter#showrunBuildingconfiguration...Currentconfiguration:627bytes!version12.4servicetimestampsdebugdatetimemsecservicetimestampslogdatetimemsecnoservicepassword-enc

3、ryption!hostnameRouter!boot-start-markerboot-end-marker!!noaaanew-model!resourcepolicy!memory-sizeiomem5noiprouting!!noipcefnoipdomainlookupinterfaceFastEthernet0/0ipaddress172.16.1.2255.255.255.0noiproute-cacheduplexautospeedauto!ipdefault-gateway172.16.

4、1.1iphttpservernoiphttpsecure-server!control-plane!linecon0loggingsynchronousnoexeclineaux0linevty04!!End3.2、R2的配置：Router#showrunRouter#showrunning-configBuildingconfiguration...Currentconfiguration:627bytes!version12.4servicetimestampsdebugdatetimemsecse

5、rvicetimestampslogdatetimemsecnoservicepassword-encryption!hostnameRouter!boot-start-markerboot-end-marker!!noaaanew-model!resourcepolicy!memory-sizeiomem5noiprouting!!noipcefnoipdomainlookup!interfaceFastEthernet0/0ipaddress172.16.2.2255.255.255.0noiprou

6、te-cacheduplexautospeedauto!ipdefault-gateway172.16.2.1iphttpservernoiphttpsecure-server!control-planelinecon0loggingsynchronousnoexeclineaux0linevty04!End3.3、R3的配置Router#showrunning-configBuildingconfiguration...Currentconfiguration:1525bytes!version12.4

7、servicetimestampsdebugdatetimemsecservicetimestampslogdatetimemsecnoservicepassword-encryption!hostnameRouter!boot-start-markerboot-end-marker!!noaaanew-model!resourcepolicy!memory-sizeiomem5!!ipcefnoipdomainlookup!interfaceFastEthernet0/0ipaddress10.1.1.

8、1255.255.255.0ipnatoutsideipvirtual-reassemblyduplexautospeedauto!interfaceFastEthernet1/0ipaddress172.16.1.1255.255.255.0ipnatinsideipvirtual-reassemblyippolicyroute-mapisp1duplexautospeedauto!interfaceFastEthernet