RIP传递默认路由的5种方法

1、RIP传递默认路由的5种方法5.jpg (18.98 KB2009-7-28 08:14在一个单出口网络内启用RIP协议，在网络出口处的路由器需要向RIP域内传播一条默认路由，这样，域内的路由器就可以通过默认路由访问外部网络。下面我们就用试验来模拟这个环境。到目前为止；通过RIP传递默认路由共有5种方法。1 default-information2 手工写一条默认路由（到NULL0） 然后重分布到RIP中3 手工写一条默认路由（到NULL0） 在进程中宣告4 ip default-network5 在接口汇总 0.0.0.0/0 到NULL0的路由*以下内容需要回复才能看到一 路由器基本配置R

2、1interface Loopback0ip address 1.1.1.1 255.255.255.0interface Serial1/0ip address 12.0.0.1 255.255.255.0router ripversion 2network 1.0.0.0network 12.0.0.0no auto-summaryR2interface Serial1/0ip address 12.0.0.2 255.255.255.0interface Serial1/1ip address 23.0.0.2 255.255.255.0router ripversion 2networ

3、k 2.0.0.0network 12.0.0.0no auto-summaryR3interface Serial1/0ip address 23.0.0.3 255.255.255.0*二 方法1 default-informationr2#sh run | b r rrouter ripversion 2network 2.0.0.0network 12.0.0.0default-information originateno auto-summaryr1#sh ip rou1.0.0.0/24 is subnetted, 1 subnetsC 1.1.1.0 is directly c

4、onnected, Loopback012.0.0.0/24 is subnetted, 1 subnetsC 12.0.0.0 is directly connected, Serial1/0R* 0.0.0.0/0 120/1 via 12.0.0.2, 00:00:09, Serial1/0 /可以看到这时在R1上产生了一条默认路由r1#ping 23.0.0.2Type escape sequence to abort.Sending 5, 100-byte ICMP Echos to 23.0.0.2, timeout is 2 seconds:!Success rate is 10

5、0 percent (5/5, round-trip min/avg/max = 28/41/68 ms此外，在default-information originate可以调用一个route-map来匹配一个接口或路由，当这个路由有效的时候才会传递默认路由。首先我们在R2上建立一个loopback接口，并将它宣告到RIP中，然后用ACL来匹配这个接口，建立route-map调用这个ACL，最后在 default-information originate命令后调用这个route-mapR2access-list 1 permit 2.2.2.2route-map WY permit 10ma

6、tch ip address 1r2#sh run | b r rrouter ripversion 2network 2.0.0.0network 12.0.0.0default-information originate route-map WYno auto-summaryr1#sh ip rou1.0.0.0/24 is subnetted, 1 subnetsC 1.1.1.0 is directly connected, Loopback02.0.0.0/32 is subnetted, 1 subnetsR 2.2.2.2 120/1 via 12.0.0.2, 00:00:02

7、, Serial1/012.0.0.0/24 is subnetted, 1 subnetsC 12.0.0.0 is directly connected, Serial1/0R* 0.0.0.0/0 120/1 via 12.0.0.2, 00:00:02, Serial1/0 /这时R2向R1传递了一条默认路由r2(config#int lo0r2(config-if#shutdown /这时我们将loopback接口关闭r1#sh ip rou1.0.0.0/24 is subnetted, 1 subnetsC 1.1.1.0 is directly connected, Loopb

8、ack012.0.0.0/24 is subnetted, 1 subnetsC 12.0.0.0 is directly connected, Serial1/0这时，R2不向R1传递默认路由，因为loopback接口关闭，ACL失效，route-map失效，所以 default-information originate命令不执行下面我们在R2,R3之间启用EIGRP，在R3上起一个loopback接口，并宣告到EIGRP中，这时R2可以学习到 3.3.3.0，在R2上建立ACL匹配从R3学习到的这条路由，随后建立route-map并调用ACL，同样最后在R2的RIP进程中的 defaul

9、t-information originate命令后面调用这个route-map。r2#sh run | b r erouter eigrp 90network 23.0.0.0 0.0.0.255no auto-summaryr3#sh run | b r erouter eigrp 90network 3.3.3.0 0.0.0.255network 23.0.0.0 0.0.0.255no auto-summaryr2#sh ip rou1.0.0.0/24 is subnetted, 1 subnetsR 1.1.1.0 120/1 via 12.0.0.1, 00:00:05, Se

10、rial1/02.0.0.0/32 is subnetted, 1 subnetsC 2.2.2.2 is directly connected, Loopback03.0.0.0/24 is subnetted, 1 subnetsD 3.3.3.0 90/2297856 via 23.0.0.3, 00:01:42, Serial1/123.0.0.0/24 is subnetted, 1 subnetsC 23.0.0.0 is directly connected, Serial1/112.0.0.0/24 is subnetted, 1 subnetsC 12.0.0.0 is di

11、rectly connected, Serial1/0R2access-list 1 permit 3.3.3.0 0.0.0.255route-map WY permit 10match ip address 1R2router ripversion 2network 12.0.0.0default-information originate route-map WYno auto-summaryr1#sh ip rou1.0.0.0/24 is subnetted, 1 subnetsC 1.1.1.0 is directly connected, Loopback012.0.0.0/24

12、 is subnetted, 1 subnetsC 12.0.0.0 is directly connected, Serial1/0R* 0.0.0.0/0 120/1 via 12.0.0.2, 00:00:01, Serial1/0 /这时R2向R1传递一条默认路由r3(config#int lo0r3(config-if#shutdown /在R3上关闭这个loopback接口r1#sh ip rou1.0.0.0/24 is subnetted, 1 subnetsC 1.1.1.0 is directly connected, Loopback012.0.0.0/24 is sub

13、netted, 1 subnetsC 12.0.0.0 is directly connected, Serial1/0R2不再向R1传递默认路由，同样因为loopback接口失效，导致 default-information originate命令不执行方法2 手工写一条默认路由（到NULL0）然后重分布到RIP中r2(config#ip route 0.0.0.0 0.0.0.0 null 0 /在R2上建立一条默认路由r2(config-router#redistribute static /重分布静态路由到RIP中r1#sh ip rou1.0.0.0/24 is subnetted,

14、 1 subnetsC 1.1.1.0 is directly connected, Loopback012.0.0.0/24 is subnetted, 1 subnetsC 12.0.0.0 is directly connected, Serial1/0R* 0.0.0.0/0 120/1 via 12.0.0.2, 00:00:02, Serial1/0 /这时，R2向R1传递一条默认路由方法3 手工写一条默认路由（到NULL0）在进程中宣告r2(config#ip route 0.0.0.0 0.0.0.0 null 0r2#sh run | b r rrouter ripversi

15、on 2network 12.0.0.0network 0.0.0.0 /将这条默认路由宣告到R2的RIP进程中no auto-summaryr1#sh ip rou1.0.0.0/24 is subnetted, 1 subnetsC 1.1.1.0 is directly connected, Loopback012.0.0.0/24 is subnetted, 1 subnetsC 12.0.0.0 is directly connected, Serial1/0R* 0.0.0.0/0 120/1 via 12.0.0.2, 00:00:07, Serial1/0 /R2向R1传递默认

16、路由方法4 ip default-networkr2(config#ip default-network 23.0.0.0 /建立一个缺省网络r1#sh ip rou1.0.0.0/24 is subnetted, 1 subnetsC 1.1.1.0 is directly connected, Loopback012.0.0.0/24 is subnetted, 1 subnetsC 12.0.0.0 is directly connected, Serial1/0R* 0.0.0.0/0 120/1 via 12.0.0.2, 00:00:09, Serial1/0 /R2向R1传递默认路由方法5 在接口汇总 0.0.0.0/0 到NULL0的路由r2(config#ip route 0.0.0.0 0.0.0.0 null 0 /先建立一条默认路由r2#sh run int s1/0interface Serial1/0ip address 12.0.0.2 255.255.255.0ip summary-address rip 0.0.0.0 0.0.0.0 /在接口上手工汇总这条默认路由r1#sh ip