一：RIP 边界汇总实验
注意：RIP V1 V2以及RIPng 都会边界汇总，只不过V2以及RIPng能关闭，但是 V1是不能关闭的，想不要汇总只能将V1升级到V2
前面的标配就不配置了
R2#sh ip route
172.16.0.0/24 is subnetted, 4 subnets
C 172.16.4.0 is directly connected, Loopback0
C 172.16.1.0 is directly connected, FastEthernet0/0
R 172.16.2.0 [120/1] via 172.16.1.1, 00:00:03, FastEthernet0/0
R 172.16.3.0 [120/1] via 172.16.1.1, 00:00:03, FastEthernet0/0
R 10.0.0.0/8 [120/1] via 172.16.1.1, 00:00:03, FastEthernet0/0
是汇总过的路由条目
R1向外发更新时与发送端口匹配看是否与该发送端口在同一网络，若是久不汇总发送子网信息给R2，若不是则汇总成汇总路由发给R2
解决方法：升级到V2
R1(config)#router rip
R1(config-router)#ver 2
R1(config-router)#no auto-summary
R2(config)#router rip
R2(config-router)#ver 2
R2(config-router)#no auto-summary
在看路由表发现已是子网信息了
R2#sh ip route
172.16.0.0/24 is subnetted, 4 subnets
C 172.16.4.0 is directly connected, Loopback0
C 172.16.1.0 is directly connected, FastEthernet0/0
R 172.16.2.0 [120/1] via 172.16.1.1, 00:00:29, FastEthernet0/0
R 172.16.3.0 [120/1] via 172.16.1.1, 00:00:29, FastEthernet0/0
10.0.0.0/8 is variably subnetted, 2 subnets, 2 masks
R 10.1.1.0/24 [120/1] via 172.16.1.1, 00:00:29, FastEthernet0/0
二：RIP v1不支持VLSM实验：
R1 R2 都运行V1版本
拓扑图与上面的图基本一致，只是在R1上再模拟出一个loopback 3口
R1(config)#int loopback 3
R1(config-if)#ip add 172.16.5.1 255.255.255.128
注意掩码是25位的了不是24位的了
此时R2 是不会学到这一路由的，
查看路由表，果然没有次路由条目
R2#sh ip route
C 172.16.4.0 is directly connected, Loopback0
C 172.16.1.0 is directly connected, FastEthernet0/0
R 172.16.2.0 [120/1] via 172.16.1.1, 00:00:02, FastEthernet0/0
R 172.16.3.0 [120/1] via 172.16.1.1, 00:00:02, FastEthernet0/0
解决方法只有将V1升级到V2
R1(config)#router rip
R1(config-router)#ver 2
R1(config-router)#no auto-summary
R2(config)#router rip
R2(config-router)#ver 2
R2(config-router)#no auto-summary
再查看路由表发现已学到了
R2#sh ip route
172.16.0.0/16 is variably subnetted, 5 subnets, 2 masks
C 172.16.4.0/24 is directly connected, Loopback0
R 172.16.5.0/25 [120/1] via 172.16.1.1, 00:00:05, FastEthernet0/0
C 172.16.1.0/24 is directly connected, FastEthernet0/0
R 172.16.2.0/24 [120/1] via 172.16.1.1, 00:00:05, FastEthernet0/0
R 172.16.3.0/24 [120/1] via 172.16.1.1, 00:00:05, FastEthernet0/0