R3(config)# interface gigabitEthernet 1/0 R3(config-if)# ip address 1.1.1.1 255.255.255.0 R3(config-if)# no shutdown R3(config-if)# interface gigabitEthernet 0/0 R3(config-if)# ip address 2.2.2.2 255.255.255.0 R3(config-if)# no shutdown R3(config-if)# do write