TCP/IP Router Diagnostic Tools
303
F I G U R E 6 . 5
Stepping through the traceroute process
This can be proved by moving one hop closer to Router C. The
ping
and
traceroute
commands use the interface closest to the next hop. Because
directly connected addresses are automatically placed in the route table,
Router B has a route to Router C, and vice versa. Look at the route table for
both routers:
Router_B>
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,
* - candidate
default U - per-user static route, o - ODR
Gateway of last resort is not set
172.16.0.0/24 is subnetted, 3 subnets
D 172.16.60.0 [90/307200] via 172.16.50.2, 00:00:01,
Ethernet0
C 172.16.30.4/30 is directly connected, Serial0
C 172.16.50.0 is directly connected, Ethernet0
Router_B>
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