Time Protocols
SNTP: Viewing, Selecting, and Configuring
Figure 9-10. Example of SNTP with Time Synchronization Disabled
Disabling the SNTP Mode. If you want to prevent SNTP from being used
even if selected by timesync (or the Menu interface’s Time Sync Method param-
eter), configure the SNTP mode as disabled.
Syntax: no sntp
Disables SNTP by changing the SNTP mode configuration to
Disabled.
For example, if the switch is running SNTP in Unicast mode with an SNTP
server at 10.28.227.141 and a server version of 3 (the default), no sntp changes
the SNTP configuration as shown below, and disables time synchronization
on the switch.
Even though the Time Sync Mode is set to Sntp,
time synchronization is disabled because no
sntp has disabled the SNTP Mode parameter.
Figure 9-11. Example of Disabling Time Synchronization by Disabling the SNTP Mode
SNTP Client Authentication
Enabling SNTP authentication allows network devices such as HP ProCurve
switches to validate the SNTP messages received from an NTP or SNTP server
before updating the network time. NTP or SNTP servers and clients must be
configured with the same set of authentication keys so that the servers can
authenticate the messages they send and clients (HP ProCurve switches) can
validate the received messages before updating the time.
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