NTP服務器上:
conf t
snmp-server community public ro
ntp autentication-key 1 md5 cxzhzx 7
ntp authenticate
ntp trusted-key 1
ntp source vlan40
ntp master 1
end

客戶端:
conf t
no ntp
ntp authentication-key 1 md5 cxzhzx 7
ntp authenticate
ntp trusted-key 1
ntp server 10.40.0.1 key 1
end