System Time Configuration Example; Network Requirements - HP 1920 Gigabit Ethernet Switch Series User Manual

Table 11 Configuration items
Item
Clock status
Source Interface
Key 1
Key 2
External
Reference
Source

System time configuration example

Network requirements

As shown in
The local clock of Device A is set as the reference clock.
•
Switch B operates in client mode, and uses Device A as the NTP server.
•
Configure NTP authentication on Device A and Switch B so that Switch B is to be synchronized to Device
A.
NTP Server
1/Reference
Key ID.
NTP Server
2/Reference
Key ID.
Figure 48:
Description
Display the synchronization status of the system clock.
Set the source interface for an NTP message.
This configuration makes the source IP address in the NTP messages the
primary IP address of this interface. If the specified source interface is
down, the source IP address is the primary IP address of the egress
interface.
TIP:
If you do not want the IP address of an interface on the local device to
become the destination address of response messages, specify the
source interface for NTP messages.
Set NTP authentication key.
Enable the NTP authentication feature for a system running NTP in a
network that requires high security. This feature improves the network
security by means of client-server key authentication, and prohibits a
client from synchronizing with a device that has failed authentication.
You can set two authentication keys, each of which has a key ID and a
key string.
•
ID—ID of a key.
•
Key string—Character string of the MD5 authentication key.
Specify the IP address of an NTP server, and configure the
authentication key ID used for the association with the NTP server. The
device synchronizes its time to the NTP server only if the key provided
by the server is the same as the specified key.
You can configure two NTP servers. The clients choose the optimal
reference source.
IMPORTANT:
The IP address of an NTP server is a unicast address, and cannot be a
broadcast or a multicast address, or the IP address of the local clock
source.
58