Deleting a logical IP interface

The no form of the interface command typically removes the entry, but all entity associations must be shut down or deleted before an interface can be deleted.

Before loop-back IP interface can be deleted, it must first be administratively disabled with the shutdown command.
After the interface has been shut down, it can then be deleted with the no interface command.

config>router
    no interface ip-int-name

Example

config>router# interface test-interface
    config>router>if# shutdown
    config>router>if# exit
    config>router# no interface test-interface
    config>router#