HP JG221A User Manual

Follow these steps to disable an interface from receiving NTP messages:
To do… Use the command… Remarks
Enter system view system-view —
Enter interface view
interface interface-type
interface-number
—
Disable the interface from
receiving NTP messages
ntp-service in-interface disable
Required
An interface is enabled to receive
NTP messages by default.
Configuring the maximum number of dynamic sessions
allowed
To do… Use the command… Remarks
Enter system view system-view —
Configure the maximum number of
dynamic sessions allowed to be
established locally
ntp-service max-dynamic-sessions
number
Required
100 by default.
Configuring access-control rights
You can configure the NTP service access-control right to the local device. The following access control
rights are available:
• 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 “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.
From the highest NTP service access-control right to the lowest one are peer, server, synchronization,
and query. When a device receives an NTP request, it performs an access-control right match and uses
the first matched right.
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 the ACL and QoS
Configuration Guide.
58

HP JG221A Specifications

General

Brand	HP
Model	JG221A
Category	Switch
Language	English