Deleting an IP address
To delete an IP address, enter the no ip address command.
device(config-if-e1000-1)# no ip address 10.1.2.1
This command deletes IP address 10.1.2.1. You do not need to enter the subnet mask.
To delete all IP addresses from an interface, enter the no ip address * command.
device(config-if-e1000-1)# no ip address *
Syntax: [no] ip address ip-addr | *