Change to Config Mode Router# configure terminal
Enter Interface Mode Router (config)# interface g0/0
interface f0/0
Interface s0/0/0
Set ip address to interface R1 (config-line)# ip address 10.0.0.1 255.255.255.0
Set interface description R1 (config-line)# description Gigabit 0/0 Interface
Turn on Interface R1 (config-line)# no shutdown
All Cisco Routers and Switches