使用RIP协议处理不连续的子网和VLSM

　　01:39:10:　172.18.0/16 via 0.0.0.0 in 1 hops

　　01:39:12: RIP: sending v2updateto 224.0.0.9 Via Serial0 (172.16.12.1)

　　01:39:12: RIP: buildupdateentries

　　01:39:12: 172.16.13.0/24 via0.0.0.0,metric 1,tag 0

　　01:39:12: RIP: rending v2updateto 224.0.0.9 via Serial1 (172.16.13.1)

　　01:39:12: RIP: buildupdateeyries

　　01:39:12: 172.16.12.0/24 via 0.0.0.0, metric 1, tag.0

　　R1#undebug all

　　All possible debugging has been turned off

　　R1#sh ip route

　　Codes: C - connected, S - static, I - IGRP, R - RIP, M - mobile, B - BGP

　　D - EIGRP, EX - EIGRP external, 0 - OSPF, IA - OSPF inter area

　　N1 - OSPF NSSA external type 1, N2 - OSPF NSSA external type 2

　　E1 - OSPF external type 1, E2 - OSPF external type 2, E - EGP

　　i - IS-IS, L1 - IS-IS level-1, L2 - IS-IS level-2, ia - IS-IS inter area

　　* - candidate default, U - per-user static route, o - ODR

　　P - periodic downloaded static route

　　Gateway of last resort is not set

　　172.16.0.0/24 is subnetted, 3 subnets

　　R　172.16.23.0 [120/1] via 172.16.12.2, 00:00:07, Serial0

　　[120/1] via 172.16.13.3, 00:00:23, Serial1

　　C　172.16.12.0 is directly connected, Serial0

　　C　172.16.13.0 is directly connected, Serial1

　　172.18.0.0/16 is variably subnetted, 2 subnets, 2 masks

　　C　172.18.1.0/24 is directly connected, Ethernet0

　　R1#ping 172.18.2.2