HP JG221A User Manual

Configuration procedure
Follow these steps to configure the NTP service access-control right to the local device:
To do… Use the command… Remarks
Enter system view system-view —
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
Required
peer by default
NOTE:
The access-control ri
g
ht mechanism provides only a minimum de
g
ree of security protection for the system
running NTP. A more secure method is identity authentication.
Configuring NTP authentication
NTP authentication should be enabled for a system running NTP in a network with 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
NTP authentication requires configuration on the client and on the server.
The following principles apply:
• For all synchronization modes, when you enable the NTP authentication feature, configure an
authentication key and specify it as a trusted key. 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 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 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. 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:
59

HP JG221A Specifications

General

Brand	HP
Model	JG221A
Category	Switch
Language	English