Router_C#show ip route
Codes: C - connected, S - static, I - IGRP, R - RIP, M - mobile, B - BGP
D - EIGRP, EX - EIGRP external, O - 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
D EX 172.17.0.0/16 [170/40537600] via 172.18.0.1, 00:09:24, Serial0
D EX 172.16.0.0/16 [170/40537600] via 172.18.0.1, 00:09:24, Serial0
C 172.19.0.0/16 is directly connected, FastEthernet0
C 172.18.0.0/16 is directly connected, Serial0