Deleting an SSH public key
Deleting an SSH public key from a switch prevents it from being used for an authenticated login.
You must be in privileged EXEC mode to delete an SSH public key from a switch.
switch# no certutil sshkey user admin rbridge-id all
Specifying a specific RBridge ID removes the key from that RBridge ID; specifying all removes it from all RBridge IDs on the switch.