78Table 3 NTP authentication resultsClient ServerAuthenticationresultEnable NTPauthenticationConfigurea key andconfigureit as atrustedkeyAssociate thekey with an NTPserverEnable NTPauthenticationConfigure akey andconfigure itas a trustedkeyYes Yes Yes Yes YesSucceeded. NTPmessages can besent and receivedcorrectly.Yes Yes Yes Yes NoFailed. NTPmessages cannotbe sent andreceived correctly.Yes Yes Yes No N/AFailed. NTPmessages cannotbe sent andreceived correctly.Yes No Yes N/A N/AFailed. NTPmessages cannotbe sent andreceived correctly.Yes N/A No N/A N/ANo authentication.NTP messagescan be sent andreceived correctly.No N/A N/A N/A N/ANo authentication.NTP messagescan be sent andreceived correctly.Configuring NTP authentication in symmetric active/passivemodeWhen you configure NTP authentication in symmetric peers mode:• Enable NTP authentication.• Configure an authentication key.• Set the key as a trusted key on both active peer and passive peer.• Associate the key with the passive peer on the active peer.The key IDs and key values configured on the active peer and passive peer must be the same. Otherwise,NTP authentication fails.To configure NTP authentication for an active peer:
