Allied Telesis AT-S60 - Manual (Page 496)

Chapter 23: Encryption
Section V: Security Features 496
7. To delete a key, select 2 - Delete Key from the Key Management
menu.
The following message is displayed:
Enter Key Id to delete -> [0 to 65535] -> 0
8. Enter the Key Id that you want to delete.
The following message appears:
Key deletion will take some time. Please wait...