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Catalyst 2950 Desktop Switch Software Configuration Guide
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Chapter 6 Configuring the System
Setting the System Date and Time
Both types of passwords can contain from 1 to 25 uppercase and lowercase alphanumeric characters, and
both can start with a number. Spaces are also valid password characters; for example, two words is a valid
password. Leading spaces are ignored; trailing spaces are recognized. The password is case sensitive.
To remove a password, use the no version of the commands: no enable secret or no enable password.
If you lose or forget your enable password, see the “Recovering from a Lost or Forgotten Password”
sectiononpage14-9.
For CLI procedures, refer to the Cisco IOS Release 12.1 documentation on Cisco.com for additional
information and CLI procedures.
Setting the System Date and Time
You can change the date and a 24-hour clock time setting on the switch. If you are entering the time for
an American time zone, enter the three-letter abbreviation for the time zone, such as PST for Pacific
standard time. If you are identifying the time zone by referring to Greenwich mean time, enter UTC
(universal coordinated time). You then must enter a negative or positive number as an offset to indicate
the number of time zones between the switch and Greenwich, England. Enter a negative number if the
switch is west of Greenwich, England, and east of the international date line. For example, California is
seven time zones west of Greenwich, so you would enter –7. Enter a positive number if the switch is east
of Greenwich. You can also enter negative and positive numbers for minutes.
Configuring Daylight Saving Time
You can configure the switch to change to daylight saving time on a particular day every year, on a day
that you enter, or not at all.
For CLI procedures, refer to the Cisco IOS Release 12.1 documentation on Cisco.com for additional
information and CLI procedures.
Configuring the Network Time Protocol
In complex networks, it is often prudent to distribute time information from a central server. The
Network Time Protocol (NTP) can distribute time information by responding to requests from clients or
by broadcasting time information.
For CLI procedures, refer to the Cisco IOS Release 12.1 documentation on Cisco.com for additional
information and CLI procedures.
Configuring the Switch as an NTP Client
YouconfiguretheswitchasanNTPclientbyenteringtheIPaddressesofuptotenNTPserversand
specifying which server should be used first. You can also enter an authentication key to be used as a
password when requests for time information are sent to the server.
Enabling NTP Authentication
To ensure the validity of information received from NTP servers, you can authenticate NTP messages
with public-key encryption. This procedure must be coordinated with the administrator of the NTP
servers: the information you enter will be matched by the servers to authenticate it.
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