H3C Technologies H3C SecPath F1000-E - Manual (Page 121)

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Configuration procedure
To configure the NTP service access-control right to the local device:
Step Command Remarks
1. Enter system view. system-view N/A
2. Configure the NTP service
access-control right for a peer device to
access the local device.
ntp-service access { peer | query
| server | synchronization }
acl-number
The default is peer.
Configuring NTP authentication
NTP authentication should be enabled for a system running NTP in a network where there is a high
security demand. It enhances the network security by means of client-server key authentication, which
prohibits a client from synchronizing with a device that has failed authentication.
Configuration prerequisites
The configuration of NTP authentication involves configuration tasks to be implemented on the client and
on the server.
When configuring NTP authentication, follow these guidelines:
• For all synchronization modes, when you enable the NTP authentication feature, configure an
authentication key and specify it as a trusted key. In other words, the ntp-service authentication
enable command must work together with the ntp-service authentication-keyid command and the
ntp-service reliable authentication-keyid command. Otherwise, the NTP authentication function
cannot be normally enabled.
• 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
To configure NTP authentication for a client: