Router_A#show arp
Protocol Address Age (min) Hardware Addr Type Interface
Internet 172.16.2.254 - 000c.ce4b.b7a7 ARPA Ethernet0
Internet 172.16.1.254 - 000c.ce4b.b7a6 ARPA FastEthernet0
Internet 172.16.1.1 1 001e.8cc8.0235 ARPA FastEthernet0
Internet 172.16.2.1 5 0013.d4c0.08d6 ARPA Ethernet0