System Time Configuration Example - 3Com Baseline 2928 PWR Plus User Manual

Table 1-1 shows the system time configuration items.
Table 1-1 System time configuration items
Manual
Source Interface
Key 1
Key 2
NTP
External
Reference
Source

System Time Configuration Example

Network requirements
As shown in
Switch B works in the client mode, and uses Device A as the NTP server.
Configure NTP authentication on Device A and Switch B.
Figure 1-2 Network diagram for configuring system time
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Device A
Item
Select to manually configure the system time, including the
setting of Year, Month, Day, Hour, Minute, and Second.
Set the source interface for an NTP message.
If you do not want the IP address of a certain interface on the
local device to become the destination address of response
messages, you can specify the source interface for NTP
messages, so that the source IP address in the NTP
messages is the primary IP address of this interface.
Set NTP authentication key.
The NTP authentication feature should be enabled for a
system running NTP in a network where there is a high
security demand. This feature enhances the network security
by means of client-server key authentication, which prohibits a
client from synchronizing with a device that has failed
authentication.
You can set two authentication keys, each of which is
composed of a key ID and key string.
NTP Server Specify the IP address of an NTP server, and configure the
1/Reference authentication key ID used for the association with the NTP
Key ID server. Only if the key provided by the server is the same with
the specified key will the device synchronize its time to the
NTP server.
You can configure two NTP servers. The clients will choose
the optimal reference source.
NTP Server
2/Reference
Key ID
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.
Figure 1-2, the local clock of Device A is set as the reference clock.
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Switch B
Description
ID is the ID of a key.
Key string is a character string for MD5 authentication key.
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