There are several IOS commands used for controlling and displaying information about IP routing.
<show ip route> <show ip route connected> <show ip route [address/hostname]> <show arp> <show ip protocol> <show ip masks> <show ip masks [network address]> <traceroute>
<clear ip route *> <clear ip route [network] [mask]> <clear arp>
In Chapter 7, "Introduction to Cisco Routers," the <show ip route> user EXEC command was introduced. Now, let's take a closer look at the IOS's route table display:
BBR-172#sh ip route Codes: C - connected, S - static, I - IGRP, R - RIP, M - mobile, B - BGP D - EIGRP, EX - EIGRP external, O - OSPF, IA ...