NTP Authentication Configuration
NTP Authentication is server client mode authentication. However, instead of normal authentication, which is always server authenticate client, NTP authentication is NTP client to authenticate NTP server.
Therefore, for NTP server, the configuration is simple
ntp authentication-key 1 md5 14141B180F0B 7
ntp source Loopback0
For NTP client, we need configure to enable authentication, assign trust key, assign NTP server.
ntp authentication-key 1 md5 110A1016141D 7
ntp authenticate
ntp trusted-key 1
ntp server 192.168.3.3 source Loopback0
The server doesn’t need “ntp authenticate” command since NTP server does not need to authenticate NTP client.
The verify command is “show ntp associate detail“
