Router_A#show ip eigrp topology
IP-EIGRP Topology Table for process 1
Codes: P - Passive, A - Active, U - Update, Q - Query, R - Reply,
r - Reply status
P 172.16.0.0/16, 1 successors, FD is 281600
via Connected, Ethernet0
P 172.17.0.0/16, 1 successors, FD is 2169856
via Connected, Serial0
P 172.18.0.0/16, 1 successors, FD is 2195456
via 172.17.0.2 (2195456/281600), Serial0