Cisco Nexus 7000 Series Reference Manual page 318

ntp authentication-key
Examples This example shows how to configure an NTP authentication key:
switch# config t
switch(config)# ntp authentication-key 42 md5 aNiceKey
switch(config)#
This example shows how to remove the NTP authentication key:
switch# config t
switch(config)# no ntp authentication-key 42 md5 aNiceKey
switch(config)#
Related Commands Command
show ntp
authentication-key
Cisco Nexus 7000 Series NX-OS System Management Command Reference
290
Description
Configures one or more keys that a time source must provide in its NTP
packets in order for the device to synchronize to it.
N Commands
OL-25806-03