3com 3CRUS2475 Manuale Utente

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sntp authentication-key
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User Guidelines
In both the date and recurring forms of the command, the first part of 
the command specifies when summer time begins, and the second part 
specifies when it ends. All times are relative to the local time zone. The 
start time is relative to standard time. The end time is relative to summer 
time. If the starting month is chronologically after the ending month, the 
system assumes that you are in the southern hemisphere.
USA rule for daylight savings time:
Start: First Sunday in April 
End: Last Sunday in October 
Time: 2 am local time
EU rule for daylight savings time:
Start: Last Sunday in March 
End: Last Sunday in October 
Time: 1.00 am (01:00)
Example
The following example sets summer time starting on the first Sunday in 
April at 2 am and finishing on the last Sunday in October at 2 am.
sntp 
authentication-key
The sntp authentication-key Global Configuration mode command 
defines an authentication key for Simple Network Time Protocol (SNTP). 
To remove the authentication key for SNTP, use the no form of this 
command.
Syntax
sntp authentication-key number md5 value 
no sntp authentication-key number
Parameters
number — Key number (Range: 1-4294967295)
Console(config)# clock summer-time recurring first sun apr 2:00 
last sun oct 2:00