isis路由泄漏及负载均衡

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1、实验需求，完成ISIS负载均衡（R1访问R4有两条路径）需求：level-1R1Level-1-2R2R3Level-2R4ISISAREA1:49.0001ISISAREA2:49.0002R1作为level-1能够收到默认路由的条件：1.R1是level12.R2R3必须是level-1-2,且必须连接到多区域正常情况下，L2路由器中会含有整个自治系统的所有路由包含L1L1需要通过路由泄漏有需求的选择L2路由。此实现选择的网络环境为Broadcast，需要选举DIS。DIS选举规则，优先级高,MAC地址大。配置如

2、下;R1Intfa0/0Ipadd12.1.1.1255.255.255.0NoshutIntfa0/1Ipadd13.1.1.1255.255.255.0NoshutIntloop0Ipadd1.1.1.1255.255.255.0NoshutExitRouterisisNet49.0001.1111.1111.1111.00Log-adjest-changesallIs-typelevel-1ExitIntfa0/1IprouterisisIntfa0/0IprouterisisIntloop0Iprouteri

3、sisR2Intfa0/0Ipadd12.1.1.2255.255.255.0NoshutIntfa0/1Ipadd24.1.1.2255.255.255.0NoshutIntloop0Ipadd2.2.2.2255.255.255.0NoshutExitRouterisisNet49.0001.2222.2222.2222.00Log-adjest-changesallIs-typelevel-1-2ExitIntfa0/0IprouterisisIntfa0/1IprouterisisIntloop0Iprout

4、erisisExitShowclnsis-neighborShowclnsneighborClearisis*ClearclnsneighborShowisishostnameShowisisdatabaseShowisisdatabaseverboseR3Intfa0/0Ipadd13.1.1.3255.255.255.0NoshutIntfa0/1Ipadd34.1.1.3255.255.255.0NoshutIntloop0Ipadd3.3.3.3255.255.255.0NoshutExitRouterisi

5、sNet49.0001.3333.3333.3333.00Log-adjest-changesallIs-typelevel-1-2ExitIntfa0/0IprouterisisIntfa0/1IprouterisisIntloop0IprouterisisExitR4Intfa0/0Ipadd34.1.1.4255.255.255.0NoshutIntfa0/1Ipadd24.1.1.4255.255.255.0Noshut’Intloop0Ipadd4.4.4.4255.255.255.0NoshutIntlo

6、op1Ipadd5.5.5.5255.255.255.0NoshutExitRouterisisNet49.0002.4444.4444.4444.00Log-adjest-changesallIs-typelevel-2-onlyExitIntfa0/0IprouterisisIntfa0/1IprouterisisIntloop0IprouterisisExitShowclnsis-neighbor查看DIS。在R1中使用showiproute可查看到两条默认路由。这样即可实现R1-R4的负载均衡。如果此时，需求

7、，R1访问R4的5.5.5.5网段，只能走下路。访问其他R4网段走上路。R1:intfa0/0Isismetric5(默认为10)修改度量值后，默认路由会优先选择去往12.1.1.2R3:routerisisRedistributeisisiplevel-2intolevel-1dis-list100ExitAccess-list100permitip5.5.5.00.0.0.255any在R3抓去5.5.5.5的路由,重分发到R1。重分发度量值为148.接下来，抓取5.5.5.5的路由，看是否真正实现了需求。