H3C Technologies H3C SecPath F1000-E - Manual (Page 126)

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• For the client/server mode or symmetric mode, associate the specified authentication key on the
client (symmetric-active peer if in the symmetric peer mode) with the corresponding NTP server
(symmetric-passive peer if in the symmetric peer mode). Otherwise, the NTP authentication feature
cannot be normally enabled.
• For the broadcast server mode or multicast server mode, associate the specified authentication key
on the broadcast server or multicast server with the corresponding NTP server. Otherwise, the NTP
authentication feature cannot be normally enabled.
• For the client/server mode, if the NTP authentication feature has not been enabled for the client, the
client can synchronize with the server regardless of whether the NTP authentication feature has
been enabled for the server or not. If the NTP authentication is enabled on a client, the client can
be synchronized only to a server that can provide a trusted authentication key.
• For all synchronization modes, the server side and the client side must be consistently configured.
Configuration Procedure
Configuring NTP authentication for a client
Follow these steps to configure NTP authentication for a client:
To do… Use the command… Remarks
Enter system view system-view —
Enable NTP authentication
ntp-service authentication
enable Required
Disabled by default
Configure an NTP authentication
key
ntp-service
authentication-keyid keyid
authentication-mode md5
value
Required
No NTP authentication key by
default
Configure the key as a trusted key
ntp-service reliable
authentication-keyid keyid
Required
By default, no authentication key is
configured to be trusted.
Client/server mode:
ntp-service unicast-server
{ ip-address | server-name }
authentication-keyid keyid
Associate the specified key with an
NTP server
Symmetric peers mode:
ntp-service unicast-peer
{ ip-address | peer-name }
authentication-keyid keyid
Required
You can associate a non-existing
key with an NTP server. To enable
NTP authentication, you must
configure the key and specify it as
a trusted key after associating the
key with the NTP server.
NOTE:
After you enable the NTP authentication feature for the client, make sure that you configure for the client
an authentication key that is the same as on the server and specify that the authentication key is trusted.
Otherwise, the client cannot be synchronized to the server.
Configuring NTP authentication for a server
Follow these steps to configure NTP authentication for a server: