H3C Technologies H3C MSR 50 - Manual (Page 49)

Step Command Remarks
interface interface-type
interface-number
61. Enter interface view. N/A
62. Disable the interface from
receiving NTP messages. By default, an interface is enabled
to receive NTP messages.
ntp-service in-interface disable
Configuring the allowed maximum number of dynamic
sessions
Step Command Remarks
63. Enter system view. system-view N/A
64. Configure the maximum
number of dynamic sessions
allowed to be established
locally.
ntp-service max-dynamic-sessions
number
The default is 100.
Configuring access-control rights
From the highest to lowest, the NTP service access-control rights are peer, server, synchronization, and
query. If a device receives an NTP request, it performs an access-control right match and uses the first
matched right. If no matched right is found, the device drops the NTP request.
• Query—Control query permitted. This level of right permits the peer devices to perform control
query to the NTP service on the local device but does not permit a peer device to synchronize its
clock to that of the local device. The so-called "control query" refers to query of some states of the
NTP service, including alarm information, authentication status, clock source information, and so
on.
• Synchronization—Server access only. This level of right permits a peer device to synchronize its
clock to that of the local device but does not permit the peer devices to perform control query.
• Server—Server access and query permitted. This level of right permits the peer devices to perform
synchronization and control query to the local device but does not permit the local device to
synchronize its clock to that of a peer device.
• Peer—Full access. This level of right permits the peer devices to perform synchronization and control
query to the local device and also permits the local device to synchronize its clock to that of a peer
device.
The access-control right mechanism provides only a minimum level of security protection for a system
running NTP. A more secure method is identity authentication.
Configuration prerequisites
Before you configure the NTP service access-control right to the local device, create and configure an
ACL associated with the access-control right. For more information about ACLs, see ACL and QoS
Configuration Guide.
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