RIP传递默认路由方法.doc

RIP传递默认路由方法（共种）图:关于传递默认路由的实验都是以下这个图RIP传递默认理由方法1：default-information originateR1:interface Loopback0ip address 1.1.1.1 255.255.255.0interface Loopback1ip address 11.11.11.11 255.255.255.0interface Serial2/1ip address 12.0.0.1 255.255.255.0router ripversion 2network 11.0.0.0network 12.0.0.0no auto-summaryR2:interface Serial2/1ip address 12.0.0.2 255.255.255.0interface Serial2/2ip address 23.0.0.2 255.255.255.0router ripversion 2network 12.0.0.0network 23.0.0.0no auto-summaryR3：interface Serial2/1ip address 23.0.0.3 255.255.255.0router ripversion 2network 23.0.0.0no auto-summarR1路由表 1.0.0.0/24 is subnetted, 1 subnetsC 1.1.1.0 is directly connected, Loopback0 23.0.0.0/24 is subnetted, 1 subnetsR 23.0.0.0 120/1 via 12.0.0.2, 00:00:02, Serial2/1 11.0.0.0/24 is subnetted, 1 subnetsC 11.11.11.0 is directly connected, Loopback1 12.0.0.0/24 is subnetted, 1 subnetsC 12.0.0.0 is directly connected, Serial2/1R2路由表：23.0.0.0/24 is subnetted, 1 subnetsC 23.0.0.0 is directly connected, Serial2/2 11.0.0.0/24 is subnetted, 1 subnetsR 11.11.11.0 120/1 via 12.0.0.1, 00:00:20, Serial2/1 12.0.0.0/24 is subnetted, 1 subnetsC 12.0.0.0 is directly connected, Serial2/1R3的路由表： 23.0.0.0/24 is subnetted, 1 subnetsC 23.0.0.0 is directly connected, Serial2/1 11.0.0.0/24 is subnetted, 1 subnetsR 11.11.11.0 120/2 via 23.0.0.2, 00:00:20, Serial2/1 12.0.0.0/24 is subnetted, 1 subnetsR 12.0.0.0 120/1 via 23.0.0.2, 00:00:20, Serial2/1R2#ping 1.1.1.1Type escape sequence to abort.Sending 5, 100-byte ICMP Echos to 1.1.1.1, timeout is 2 seconds:.Success rate is 0 percent (0/5)没路由不通在R1上做：R1(config)#router ripR1(config-router)#default-information originate/可以加个route-map，也可以直接回车咱们直接回车看效果R1路由表 1.0.0.0/24 is subnetted, 1 subnetsC 1.1.1.0 is directly connected, Loopback0 23.0.0.0/24 is subnetted, 1 subnetsR 23.0.0.0 120/1 via 12.0.0.2, 00:00:01, Serial2/1 11.0.0.0/24 is subnetted, 1 subnetsC 11.11.11.0 is directly connected, Loopback1 12.0.0.0/24 is subnetted, 1 subnetsC 12.0.0.0 is directly connected, Serial2/1R2路由表： 23.0.0.0/24 is subnetted, 1 subnetsC 23.0.0.0 is directly connected, Serial2/2 11.0.0.0/24 is subnetted, 1 subnetsR 11.11.11.0 120/1 via 12.0.0.1, 00:00:19, Serial2/1 /说明明细路由可以发出 12.0.0.0/24 is subnetted, 1 subnetsC 12.0.0.0 is directly connected, Serial2/1R* 0.0.0.0/0 120/1 via 12.0.0.1, 00:00:19, Serial2/1 /默认路由出来了R3路由表： 23.0.0.0/24 is subnetted, 1 subnetsC 23.0.0.0 is directly connected, Serial2/1 11.0.0.0/24 is subnetted, 1 subnetsR 11.11.11.0 120/2 via 23.0.0.2, 00:00:25, Serial2/1 12.0.0.0/24 is subnetted, 1 subnetsR 12.0.0.0 120/1 via 23.0.0.2, 00:00:25, Serial2/1R* 0.0.0.0/0 120/2 via 23.0.0.2, 00:00:25, Serial2/1R2#ping 1.1.1.1Type escape sequence to abort.Sending 5, 100-byte ICMP Echos to 1.1.1.1, timeout is 2 seconds:!Success rate is 100 percent (5/5), round-trip min/avg/max = 172/249/360 ms可以说明默认路由起了效果在R1上做：R1(config)#router ripR1(config-router)#default-information originate route-map QQ /名字随便起在看R2路由表： 23.0.0.0/24 is subnetted, 1 subnetsC 23.0.0.0 is directly connected, Serial2/2 11.0.0.0/24 is subnetted, 1 subnetsR 11.11.11.0 120/1 via 12.0.0.1, 00:00:14, Serial2/1 12.0.0.0/24 is subnetted, 1 subnetsC 12.0.0.0 is directly connected, Serial2/1发现默认路由没有了。可是当我用route-map QQ匹配1.1.1.0/24的路由后R1(config)#ip prefix-list 1 per 1.1.1.0/24R1(config)#route-map QQR1(config-route-map)#match ip add prefix-list 1在看R2的路由表： 23.0.0.0/24 is subnetted, 1 subnetsC 23.0.0.0 is directly connected, Serial2/2 11.0.0.0/24 is subnetted, 1 subnetsR 11.11.11.0 120/1 via 12.0.0.1, 00:00:03, Serial2/1 12.0.0.0/24 is subnetted, 1 subnetsC 12.0.0.0 is directly connected, Serial2/1R* 0.0.0.0/0 120/1 via 12.0.0.1, 00:00:03, Serial2/1/又出来了 总结：default-information originate 可以向网络传递默认路由，自己路由表中没有默认路由存在，如果后面加了route-map,只有自己路由表中有自己匹配的路由才会向其他路由器发送默认路由,路由条目可以是直连也可以是从lab 学来路由,也可以是静态路由.方法2：创建手工建立一条默认路由到NULL0口,在进行重分布在R1上：R1(config)#ip route 0.0.0.0 0.0.0.0 null 0R1(config)#router ripR1(config-router)#redistribute static metric 2/在RIP中重分布静态路由度量默认是1（在向RIP区域重分布路由的时候，必须指定度量值，或者通过default-metric命令设置默认种子度量值，因为RIP默认种子度量值为无穷大，只有重分布静态特殊，可以不指定度量值）现在观察R1路由表： 1.0.0.0/24 is subnetted, 1 subnetsC 1.1.1.0 is directly connected, Loopback0 23.0.0.0/24 is subnetted, 1 subnetsR 23.0.0.0 120/1 via 12.0.0.2, 00:00:08, Serial2/1 11.0.0.0/24 is subnetted, 1 subnetsC 11.11.11.0 is directly connected, Loopback1 12.0.0.0/24 is subnetted, 1 subnetsC 12.0.0.0 is directly connected, Serial2/1S* 0.0.0.0/0 is directly connected, Null0/自己手工创建的R2的路由表： 23.0.0.0/24 is subnetted, 1 subnetsC 23.0.0.0 is directly connected, Serial2/2 11.0.0.0/24 is subnetted, 1 subnetsR 11.11.11.0 120/1 via 12.0.0.1, 00:00:11, Serial2/1 12.0.0.0/24 is subnetted, 1 subnetsC 12.0.0.0 is directly connected, Serial2/1R* 0.0.0.0/0 120/2 via 12.0.0.1, 00:00:11, Serial2/1 /传递过来的默认路由度量2是进行重分布的时候设置的R3的路由表： 3.0.0.0/24 is subnetted, 1 subnetsC 3.3.3.0 is directly connected, Loopback0 23.0.0.0/24 is subnetted, 1 subnetsC 23.0.0.0 is directly connected, Serial2/1 11.0.0.0/24 is subnetted, 1 subnetsR 11.11.11.0 120/2 via 23.0.0.2, 00:00:06, Serial2/1 /不会抑制掉明细的发送 12.0.0.0/24 is subnetted, 1 subnetsR 12.0.0.0 120/1 via 23.0.0.2, 00:00:06, Serial2/1R* 0.0.0.0/0 120/3 via 23.0.0.2, 00:00:06, Serial2/1 /R3上也一样有默认路由注意：手工创建的默认路由如果跟出接口和下一跳地址，默认路由不会从这个接口和能到达下一跳地址的那个接口传递出去因为水平分割的问题。RIP中水平分割默认开启传递默认路由方法3：手工建立一条静态默认路由,在RIP进程用NETWORK宣告出去R1(config)#ip route 0.0.0.0 0.0.0.0 null 0R1(config)#router ripR1(config-router)#net 0.0.0.0R1路由表： 1.0.0.0/24 is subnetted, 1 subnetsC 1.1.1.0 is directly connected, Loopback0 23.0.0.0/24 is subnetted, 1 subnetsR 23.0.0.0 120/1 via 12.0.0.2, 00:00:14, Serial2/1 11.0.0.0/24 is subnetted, 1 subnetsC 11.11.11.0 is directly connected, Loopback1 12.0.0.0/24 is subnetted, 1 subnetsC 12.0.0.0 is directly connected, Serial2/1S* 0.0.0.0/0 is directly connected, Null0R2上路由表：1.0.0.0/24 is subnetted, 1 subnetsR 1.1.1.0 120/1 via 12.0.0.1, 00:00:05, Serial2/1 /这条路由也被宣告被R2学习到 23.0.0.0/24 is subnetted, 1 subnetsC 23.0.0.0 is directly connected, Serial2/2 11.0.0.0/24 is subnetted, 1 subnetsR 11.11.11.0 120/1 via 12.0.0.1, 00:00:06, Serial2/1 12.0.0.0/24 is subnetted, 1 subnetsC 12.0.0.0 is directly connected, Serial2/1R* 0.0.0.0/0 120/1 via 12.0.0.1, 00:00:06, Serial2/1 /默认路由被传递如果把创建静态路由改成这样R1(config)#ip route 0.0.0.0 0.0.0.0 s2/1R2的路由表 23.0.0.0/24 is subnetted, 1 subnetsC 23.0.0.0 is directly connected, Serial2/2 11.0.0.0/24 is subnetted, 1 subnetsR 11.11.11.0 120/1 via 12.0.0.1, 00:00:14, Serial2/1 12.0.0.0/24 is subnetted, 1 subnetsC 12.0.0.0 is directly connected, Serial2/1/默认路由没了。总结：手工创建默认路由在RIP进程中宣告0.0.0.0以后，虽然可以传递默认路由但是它把那些没宣告的网络也宣告了出去导致其他路由器有了这些网络的路由信息。注意：手工创建的默认路由如果跟出接口和下一跳地址，默认路由不会从这个接口和能到达下一跳地址的那个接口传递出去（和方法要注意的一样）/B传递默认路由方法4：先手工创建默认路由到NULL0,然后在想传送默认路由的接口下手工汇总默认路由 ip summary-address rip 0.0.0.0 0.0.0.0R1(config)#ip route 0.0.0.0 0.0.0.0 nu 0R1(config)#int s2/1R1(config-if)#ip summary-address rip 0.0.0.0 0.0.0.0 看R1的路由表：1.0.0.0/24 is subnetted, 1 subnetsC 1.1.1.0 is directly connected, Loopback0 23.0.0.0/24 is subnetted, 1 subnetsR 23.0.0.0 120/1 via 12.0.0.2, 00:00:12, Serial2/1 11.0.0.0/24 is subnetted, 1 subnetsC 11.11.11.0 is directly connected, Loopback1 12.0.0.0/24 is subnetted, 1 subnetsC 12.0.0.0 is directly connected, Serial2/1S* 0.0.0.0/0 is directly connected, Null0R2的路由表： 23.0.0.0/24 is subnetted, 1 subnetsC 23.0.0.0 is directly connected, Serial2/2 12.0.0.0/24 is subnetted, 1 subnetsC 12.0.0.0 is directly connected, Serial2/1R* 0.0.0.0/0 120/1 via 12.0.0.1, 00:00:12, Serial2/1 /默认路由有了但是没有了11.11.11.0这条路由了。如果在R1上做这样的操作R1(config)#ip route 0.0.0.0 0.0.0.0 s2/1R2的路由表： 23.0.0.0/24 is subnetted, 1 subnetsC 23.0.0.0 is directly connected, Serial2/2 12.0.0.0/24 is subnetted, 1 subnetsC 12.0.0.0 is directly connected, Serial2/1R* 0.0.0.0/0 120/1 via 12.0.0.1, 00:00:06, Serial2/1/默认路由还在总结：用手工汇总的方法传递默认路由，具有方向性，即在哪个接口做的汇总就会从那个接口传递默认路由，它不管创建的默认路由接口和下一跳地址（注意和方法和的对比说明手工汇总由于水平分割）但是如果这样会造成路由环路所以建议手工创建到默认路由接口写null0，会在这个接口抑制掉了除了静态路由以外的明细路由(也要注意对比这句所说的传递默认路由方法5：ip default-networkR1(config)#ip default-network 1.0.0.0看R1的路由表：* 1.0.0.0/24 is subnetted, 1 subnets/会多个*号C 1.1.1.0 is directly connected, Loopback0 23.0.0.0/24 is subnetted, 1 subnetsR 23.0.0.0 120/1 via 12.0.0.2, 00:00:18, Serial2/1 11.0.0.0/24 is subnetted, 1 subnetsC 11.11.11.0 is directly connected, Loopback1 12.0.0.0/24 is subnetted, 1 subnetsC 12.0.0.0 is directly connected, Serial2/1R2的路由表： 23.0.0.0/24 is subnetted, 1 subnetsC 23.0.0.0 is directly connected, Serial2/2 11.0.0.0/24 is subnetted, 1 subnetsR 11.11.11.0 120/1 via 12.0.0.1, 00:00:17, Serial2/1 12.0.0.0/24 is subnetted, 1 subnetsC 12.0.0.0 is directly connected, Serial2/1R* 0.0.0.0/0 120/1 via 12.0.0.1, 00:00:17, Serial2/1/默认路由出现如果命令R1(config)#ip default-network 1.1.1.0在看路由表： 1.0.0.0/8 is variably subnetted, 2 subnets, 2 masksC 1.1.1.0/24 is directly connected, Loopback0S 1.0.0.0/8 1/0 via 1.1.1.0 /会多出现一条静态路由 23.0.0.0/24 is subnetted, 1 subnetsR 23.0.0.0 120/1 via 12.0.0.2, 00:00:09, Serial2/1 11.0.0.0/24 is subnetted, 1 subnetsC 11.11.11.0 is directly connected, Loopback1 12.0.0.0/24 is subnetted, 1 subnetsC 12.0.0.0 is directly connected, Serial2/1R2的路由表： 23.0.0.0/24 is subnetted, 1 subnetsC 23.0.0.0 is directly connected, Serial2/2 11.0.0.0/24 is subnetted, 1 subnetsR